Journal articles: 'Lithologie'

1

GURI, S., L. GJANI, S. RANXHA, M. GURl, and A. XHAXHIU. "Sequence stratigraphy, quaternary basin analyses in the Adriatic Foredeep." Bulletin of the Geological Society of Greece 34, no. 2 (August 1, 2018): 635. http://dx.doi.org/10.12681/bgsg.17117.

Full text

Abstract:

This paper intends to give the characterization of Quaternary loose deposits, near and along the sea coast zone, by evaluating lithological-geologic parameters, depositional environments and the tectonic subsidence. The main objectives are: - The lithologic-facial zone by mapping of lithologie composition and facies distribution. - The Quaternary basin analyses by interpreting depositional sequences of third order, where system tracts (lowstand, shelf wedge, transgressive and highstand) are individualized. - The present fluvial processes and delta configuration (Shkumbin, Seman).

APA, Harvard, Vancouver, ISO, and other styles

2

Houck, Richard T. "Quantifying the uncertainty in an AVO interpretation." GEOPHYSICS 67, no. 1 (January 2002): 117–25. http://dx.doi.org/10.1190/1.1451395.

Full text

Abstract:

Lithologic interpretations of amplitude variation with offset (AVO) information are ambiguous both because different lithologies occupy overlapping ranges of elastic properties, and because angle‐dependent reflection coefficients estimated from seismic data are uncertain. This paper presents a method for quantifying and combining these two components of uncertainty to get a full characterization of the uncertainty associated with an AVO‐based lithologic interpretation. The result of this approach is a compilation of all the lithologies that are consistent with the observed AVO behavior, along with a probability of occurrence for each lithology. A 2‐D line from the North Sea illustrates how the method might be applied in practice. For any data set, the interaction between the geologic and measurement components of uncertainty may significantly affect the overall uncertainty in a lithologic interpretation.

APA, Harvard, Vancouver, ISO, and other styles

3

Stinder, Thomas. "Stratigraphy and Lithology of the Rhaetic in the Central Part of Lower Saxony." Zeitschrift der Deutschen Geologischen Gesellschaft 140, no. 1 (January 1, 1989): 87–99. http://dx.doi.org/10.1127/zdgg/140/1989/87.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Lapakko, Kim A., Jennifer N. Engstrom, and David A. Antonson. "EFFECTS OF PARTICLE SIZE ON DRAINAGE QUALITY FROM THREE LITHOLOGIE." Journal American Society of Mining and Reclamation 2006, no. 2 (June 30, 2006): 1026–50. http://dx.doi.org/10.21000/jasmr06021026.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kärcher, Thomas. "Beiträge zur Lithologie und Hydrogeologie der Lockergesteinsablagerungen (Pliozän, Quartär) im Raum Frankenthal, Ludwigshafen, Mannheim, Speyer." Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins 69 (April 21, 1987): 279–320. http://dx.doi.org/10.1127/jmogv/69/1987/279.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Dill, Harald, and Christoph Hartkopf-Fröder. "Stratigraphy and Lithology of the Permo-Carboniferous Beds from the Weiden Basin (NE Bavaria, West Germany)." Zeitschrift der Deutschen Geologischen Gesellschaft 141, no. 1 (January 1, 1990): 31–47. http://dx.doi.org/10.1127/zdgg/141/1990/31.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Mott, Robert J., and Douglas R. Grant. "Pre-Late Wisconsinan Paleoenvironments in Atlantic Canada." Géographie physique et Quaternaire 39, no. 3 (December 4, 2007): 239–54. http://dx.doi.org/10.7202/032606ar.

Full text

Abstract:

ABSTRACT Numerous Quaternary organic deposits of various lithologies beneath one or more till units of Wisconsinan age have been discovered in boreholes and exposures in coastal bluffs, quarries and river banks at widespread localities throughout Atlantic Canada. Ongoing palynological and macro-fossil studies, still in a preliminary stage at many sites, reveal a variety of environments from forests dominated by thermophilous hardwood genera and white pine, to mixed temperate hardwood and conifer forests, to boreal coniferous forests of spruce and balsam fir, and forest tundra and tundra communities characterized by spruce, shrubs and herbs. Lithologie and pollen stratigraphie relationships and radiocarbon, amino acid and Thorium/Uranium dating allow a tentative assignment to the Sangamonian Stage and possibly to Early and Middle Wisconsinan time. Three intervals of organic accumulation are apparent: an early interval, when climate became warmer than the present; a second interval, when climate was similar to the present; and a third interval, with cooler climate. The latter interval is characterized by at least three climatic cycles, each one cooler than the previous cycle. Tentative correlations with the deep-sea oxygen isotope record and continental palynological records are presented.

APA, Harvard, Vancouver, ISO, and other styles

8

Zouaoui, Nassira, Radhia Mansour, and Abdessalem El Ghali. "Utilisation du modèle PAP/CAR et du SIG pour un zonage du risque d’érosion hydrique. Exemple du bassin versant de Tessa (Tunisie)." Revue Internationale de Géomatique 29, no. 3-4 (July 2019): 361–80. http://dx.doi.org/10.3166/rig.2020.00096.

Full text

Abstract:

Dans les régions méditerranéennes humides en particulier le nord-ouest de la Tunisie, le bassin versant de Tessa est caractérisé par des pluies torrentielles et irrégulières, combinées à une déforestation importante, provoquant une érosion sévère du sol. Le processus d’érosion hydrique est très fréquent et change d’aspect dynamique selon l’évolution et la variation spatiale de la nature lithologique des roches, la géomorphologie des paysages, la géométrie des bassins versants et leur situation bioclimatique. Dans ce cadre d’étude, un organigramme méthodologique adéquat a été suivi en appliquant la méthode de cartographie d’érosion PAP/CAR qui se base sur le principe de pondération des principaux facteurs qui contrôlent le fonctionnement érosif : le couvert végétal, la pente et la lithologie. L’interaction des cartes résultantes et leur évolution spatio-temporelle à l’échelle du bassin versant de Tessa a permis d’établir un zonage cartographique par classement de la zone d’étude en plusieurs secteurs selon leur degrés de susceptibilité rangés en 5 niveaux d’érosion avec des pourcentages de 27,74 % pour l’année 1985, 27,55 % pour 2003 et 27,81 % pour 2017 pour les classes élevée et très élevée de la surface totale de la zone d’étude.

APA, Harvard, Vancouver, ISO, and other styles

9

Mraz, Elena, Daniel Bohnsack, Georg Stockinger, Heiko Käsling, Kai Zosseder, and Kurosch Thuro. "The importance of analogue outcrops of the Upper Jurassic to interprete the lithology of the deep geothermal borehole Geretsried." Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins 100 (March 16, 2018): 517–48. http://dx.doi.org/10.1127/jmogv/100/0016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Dionne, Jean-Claude. "Lithologie des cailloux de la baie de Montmagny, côte sud du Saint-Laurent, Québec." Géographie physique et Quaternaire 41, no. 1 (December 18, 2007): 161–69. http://dx.doi.org/10.7202/032673ar.

Full text

Abstract:

RÉSUMÉ À Montmagny, sur la rive sud de l'estuaire du Saint-Laurent, à environ 75 km en aval de Québec, d'abondants cailloux de lithologies variées parsèment la zone intertidale, malgré l'absence de dépôts grossiers en bordure du rivage actuel. Les cailloux reposent directement sur un substrat composé de sable fin, limon, vase et argile marine. Ce milieu, dominé par la sédimentation fine, se révèle donc assez original puisqu'il implique des agents de transport et de mise en place fort différents: d'un côté, vagues, courants et marées, de l'autre, les glaces flottantes. L'abondance des cailloux a permis de faire de nombreux comptages et de calculer les pourcentages de chacune des lithologies représentées. Les 42 105 cailloux comptés comprennent 19,9% d'éléments précambriens (gneiss, granite, anorthosite, etc.), 59,5 % de grès, 13,6 % des schistes. 6 % de calcaires et 1 % de conglomérats. Les cailloux proviennent de trois grandes unités géologiques: le Bouclier laurentidien (Précambrien) au nord, les formations côtières appalachiennes (Cambro-Ordovicien) au sud et les formations sédimentaires des basses terres du Saint-Laurent (Ordovicien) au sud-ouest. Bien qu'une forte proportion des cailloux soit d'origine locale, une partie a subi des déplacements de l'ordre de 100 à 200 km. Les glaces flottantes constituent le principal agent de transport et de mise en place.

APA, Harvard, Vancouver, ISO, and other styles

11

Marrs, Christopher D. "Geology, Lithologie Association, and Depositional Environment of the Oposura Massive Sulfide Deposit, Sonora, Mexico." Journal of Geochemical Exploration 25, no. 1-2 (March 1986): 255. http://dx.doi.org/10.1016/0375-6742(86)90053-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Hu, Suyun, Wenzhi Zhao, Zhaohui Xu, Hongliu Zeng, Qilong Fu, Lei Jiang, Shuyuan Shi, Zecheng Wang, and Wei Liu. "Applying principal component analysis to seismic attributes for interpretation of evaporite facies: Lower Triassic Jialingjiang Formation, Sichuan Basin, China." Interpretation 5, no. 4 (November 30, 2017): T461—T475. http://dx.doi.org/10.1190/int-2017-0004.1.

Full text

Abstract:

In China and elsewhere, it is important to predict different lithologies and lithofacies for hydrocarbon exploration in a mixed evaporite-carbonate-siliciclastic system. The lower section of the second member of the Jialingjiang Formation (T1j2L) is mainly composed of anhydrite, dolostone, limestone, and siliciclastic rocks, providing a rare opportunity to reconstruct detailed facies in a [Formula: see text] 3D seismic survey with 31 wells. Wireline logs (sonic, density, and gamma ray) calibrated by core analysis are essential in distinguishing anhydrite, siliciclastics, and carbonates. Although different lithologies are characterized by different acoustic impedance (AI), with certain overlapping, it is still difficult to predict lithology by any single seismic attribute because of the limited seismic resolution in a thinly interbedded formation of multiple lithologies. In our study, principal component analysis (PCA) was applied to extract lithologic information from selected seismic attributes; the first two principal components were used to predict the content of anhydrite, siliciclastics, and carbonates. Content maps of anhydrite, siliciclastics, and carbonates — created by mixing the represented color — were used to reconstruct lithofacies of the T1j2L submember. It is quite difficult, even with the PCA approach, to uniquely resolve the three lithologies due to the overlapped AI and the limited resolution of the seismic data. However, the workflow that we evaluated dramatically improved the prediction accuracy of lithology and lithofacies. Facies transition during the deposition of the T1j2L submember in the study area was inferred from a paleo-uplift in the southwest to a restricted lagoon and then to an open marine setting in the northeast.

APA, Harvard, Vancouver, ISO, and other styles

13

Speece, Marvin A., Timothy D. Bowen, James L. Folcik, and Henry N. Pollack. "Analysis of temperatures in sedimentary basins: the Michigan Basin." GEOPHYSICS 50, no. 8 (August 1985): 1318–34. http://dx.doi.org/10.1190/1.1442003.

Full text

Abstract:

We develop an analytical and numerical methodology for the analysis of large bottom‐hole temperature (BHT) data sets from sedimentary basins, and test the methodology using temperature, stratigraphic, and lithologic data from 411 boreholes in the Michigan Basin. Least‐squares estimates of temperature gradients in the formations and lithologies present are calculated as solutions to a large system of linear equations. At each borehole the temperature difference between the bottom and top of the hole is represented as a sum of temperature increments through the various formations or lithologies penetrated by the borehole. Quadratic programming techniques enable bounds to be placed on the gradient solutions in order to suppress or exclude improbable gradient estimates. Numerical experiments with synthetic data reveal that the estimates of temperature gradients for a given formation or lithology are sensitive to the degree of representation of that unit; well represented units have more stable gradient estimates in the presence of noise than do poorly represented units. The estimates of temperature gradients obtained for lithologies are more stable than those for formations and are believed to be good estimates of actual lithologic temperature gradients in the Michigan Basin. Formation temperature gradients obtained as a weighted sum of the estimates of the component lithologic temperature gradients appear to be good estimates of the average temperature gradients for the formations of the basin. At each borehole a temperature residual exists corresponding to the difference between the observed BHT and the BHT predicted by the estimated interval temperature gradients. Residuals are far more stable than estimated temperature gradients. The values of residuals change little regardless of whether lithology, formation, bounded, or unbounded gradient estimates are used to calculate them. Maps of residuals indicate well‐defined and spatially coherent patterns of positive and negative temperature residuals. Filtered subsets of large‐magnitude residuals alone show a pattern of negative residuals coinciding with the mid‐Michigan gravity high, a geophysical feature thought to delineate a Precambrian (Keweenawan) rift zone in the crust beneath the basin. Thermal models of the Michigan Basin and the crust and upper mantle beneath the basin indicate that the suspected rift beneath the basin can cause a variation in basement heat flow sufficient to produce temperature residuals of the magnitude observed in the sediments, with negative temperature residuals over the area of the rift.

APA, Harvard, Vancouver, ISO, and other styles

14

Zippi, Pierre A., and Andrew F. Bajc. "Recognition of a Cretaceous outlier in northwestern Ontario." Canadian Journal of Earth Sciences 27, no. 2 (February 1, 1990): 306–11. http://dx.doi.org/10.1139/e90-029.

Full text

Abstract:

Borehole F-88-33, located near Rainy River, Ontario, intersected Cretaceous nonmarine clastic sediments. This is the first documented occurrence in Ontario of Cretaceous sediments associated with the western interior. Lithologie and heavy-mineral analyses were used to differentiate this unit from the overlying Quaternary sediments. Seventy-five species of fossil angiosperm pollen, gymnosperm pollen, spores, megaspores, and algal cysts were recovered from borehole F-88-33 and used to date the pre-Quaternary sediments as late Albian to early Cenomanian. The occurrence of these nonmarine sediments in northwestern Ontario helps to better define the limits of Cretaceous sedimentation in the western interior.

APA, Harvard, Vancouver, ISO, and other styles

15

Meng, Stefan, and Stefan Wansa. "Lithologie, Stratigraphie und Paläoökologie des Mittelpleistozäns von Uichteritz im Markröhlitzer Tal (Lkr. Weißenfels/Sachsen-Anhalt)." E&G Quaternary Science Journal 55, no. 1 (January 1, 2005): 174–214. http://dx.doi.org/10.3285/eg.55.1.09.

Full text

Abstract:

Abstract. Die seit ca. 100 Jahren umstrittene Flussgeschichte des Markröhlitzer Tales westlich von Weißenfels wird anhand neuer lithologischer und malakologischer Untersuchungen der pleistozänen Schichtenfolge in der Kiessandgrube Uichteritz diskutiert. Es konnten drei übereinander lagernde fluviatile Schotterkörper ausgehalten werden, die sich in Profilaufbau, Geröllzusammensetzung und Verwitterungsintensität unterscheiden. Sie sind durch Schlufflagen bzw. Altwasserablagerungen und schwemmfächerartige Sedimente voneinander getrennt. Der Untere Schotter ist frei von nordischem Material und kann nach der Höhenlage der frühen Elster-Kaltzeit zugeordnet werden, der Mittlere und der Obere Schotter wurden wahrscheinlich in der späten Elster-Kaltzeit akkumuliert. Dafür sprechen die gegenüber der Hauptterrasse um 10-15 m höhere Lage, die Bedeckung durch saaleglaziäre Bildungen (Beckenschluff, Bänderton, Grundmoräne) und die differenzierten Verwitterungsbildungen, die zudem übereinstimmend mit den Molluskengesellschaften eine spätelsterzeitliche Wärmeschwankung andeuten. Molluskenfunde lieferten wichtige paläoökologische Informationen über die Bildungszeit der untersuchten Sedimente. Aus den vermutlich spätelsterzeitlichen Flussablagerungen sowie aus den im Hangenden folgenden saale- und weichselkaltzeitlichen Bildungen konnten diesbezüglich insgesamt 10 molluskenführende Horizonte untersucht werden. Aus den Unteren und Oberen Schottern sind bisher keine Fauneninhalte bekannt geworden. Die wahrscheinlich spätelsterzeitlichen Molluskenfaunen charakterisieren deutlich unterscheidbare Faziesbereiche: fluviatile Schotterablagerungen der Saale, welche durch Fließgewässerarten dominiert werden, sowie Stillwassersedimente einer von der Saale isolierten Fließrinne bzw. eines Altarmbereiches, welche durch Stillgewässerarten dominiert werden. Nach der etwa 48 Arten umfassenden Gesamtfauna zu urteilen, fällt die Bildungszeit der Sedimente in eine mildere kaltzeitliche Phase. Zahlreiche gehölzliebende Arten lassen darauf schließen, dass in der Saaleaue Auenwälder entwickelt waren. Ausgesprochene Steppenelemente fehlen weitestgehend, was mit den taphonomischen Verhältnissen im Ablagerungsraum innerhalb der Saaleaue in Verbindung gebracht wird. Zwar ist die Rekonstruktion des weiteren Umfeldes wegen vermutlicher Überlieferungslücken problematisch, zumindest zeigen aber die individuenreichen Vorkommen von Offenlandelementen, dass wahrscheinlich außerhalb der Aue keine geschlossene Bewaldung vorhanden war. Für kühlere Bedingungen sprechen einige subarktischalpine sowie boreale und montane Faunen-Elemente. Aus saalekaltzeitlichen Beckenschluffen sowie Geschiebemergeln konnten hochkaltzeidiche Molluskenfaunen nachgewiesen werden, wobei besonders die Vorkommen im Geschiebemergel bemerkenswert sind. Kaltzeitliche Mollusken fanden sich auch in weichselzeitlichen Lössen.

APA, Harvard, Vancouver, ISO, and other styles

16

Poschmann, Markus, and Ulrich Jansen. "Lithologie und Fossilführung einiger Profile in den Siegen-Schichten des Westerwaldes (Unter-Devon, Rheinisches Schiefergebirge)." Senckenbergiana Lethaea 83, no. 1-2 (December 2003): 157–83. http://dx.doi.org/10.1007/bf03043311.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Coulibaly, Yoh Natogoma, Fori Yao Paul Assale, Ismaël Ben Ouattara, and Sylvain Monde. "Evolution lithostratigraphique et diagénétique des dépôts argileux de l’albien du bassin sédimentaire de côte d’ivoire." International Journal of Biological and Chemical Sciences 14, no. 3 (June 19, 2020): 1153–66. http://dx.doi.org/10.4314/ijbcs.v14i3.40.

Full text

Abstract:

Nombreuses études sur les déblais de forage à l’Albien du bassin sédimentaire (Côte d’Ivoire) ont montré la présence d’un fort taux de dépôts d’argiles. Toutefois, ces roches argileuses apparemment identiques peuvent être différentes chimiquement. Afin de caractériser ces roches, deux types d’analyses ont été réalisées : l’analyse de la poudre de roche et celle de la fraction fine. Le traitement des données de la poudre de roche s’est fait avec le logiciel EVA et celui de la fraction fine avec le logiciel Fytik 0.9.8. L’analyse lithologique des sédiments d’âge albien présente une alternance de bancs d’argile, de sables, de grès, de silts et de kaolin. Au toit, alternent avec les bancs d’argiles des bancs carbonatés. Le cortège détritique est essentiellement constitué de quartz, albite, traces de microcline, sidérite et calcite. En outre, les minéraux argileux sont constitués de : la kaolinite, des interstratifiés néoformés à deux feuillets : l’illite/smectite régulier (R1) par endroits et illite/chlorite irrégulier (R0) à la base de l’Albien moyen et des interstratifiés néoformés à trois feuillets : illite/chlorite/smectite, illite/vermiculite/smectite. Ces minéraux traduisent une évolution en fonction de la profondeur impliquant la disparition progressive des feuillets de smectite et l’apparition progressive des feuillets de chlorite. Cette évolution est favorisée par une diagénèse d’enfouissement (qui évolue en fonction de la profondeur).Mots clés : Diagénèse, minéralogie, lithologie, Albien.

APA, Harvard, Vancouver, ISO, and other styles

18

Hauschke, Norbert, and Carmen Heunisch. "Lithology and palynology of well USB 3 (Horn - Bad Meinberg, eastern North-Rhine Westphalia) A contribution to the facies development in the Keuper." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 181, no. 1-3 (December 10, 1990): 79–105. http://dx.doi.org/10.1127/njgpa/181/1990/79.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Ledru, P., J. L. Lasserre, E. Manier, and D. Mercier. "Le Proterozoique inferieur nord guyanais; revision de la lithologie, tectonique transcurrente et dynamique des bassins sedimentaires." Bulletin de la Société Géologique de France 162, no. 4 (July 1, 1991): 627–36. http://dx.doi.org/10.2113/gssgfbull.162.4.627.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Berkhli, M., D. Vachard, and J. C. Paicheler. "Les séries du carbonifère inférieur de la région d'Adarouch, NE du Maroc central: lithologie et biostratigraphie." Journal of African Earth Sciences 32, no. 4 (May 2001): 557–71. http://dx.doi.org/10.1016/s0899-5362(02)00040-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Alberti, Gerhard K. B., and Lore Alberti. "Zur Lithologie, Fauna und Stratigraphie des unterdevonischen Anteils der „Harzgerode-Tongallen-und Kieselgallenschiefer-Formation“ (herzynische Beckenfazies, Unterharz)." Senckenbergiana lethaea 76, no. 1-2 (December 1996): 113–19. http://dx.doi.org/10.1007/bf03042844.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

ΣΙΓΑΛΟΣ, ΓΕΩΡΓΙΟΣ, and ΑΛΙΚΗ ΑΛΕΞΟΥΛΗ-ΛΕΙΒΑΔΙΤΗ. "Εκτίμηση της τρωτότητας στη διάβρωση των γεωλογικών σχηματισμών και της παραγωγής φερτών υλών στη λεκάνη απορροής του Εσωτερικού Μαλιακού Κόλπου." Bulletin of the Geological Society of Greece 38 (September 10, 2005): 115. http://dx.doi.org/10.12681/bgsg.18431.

Full text

Abstract:

The geomorphology and the lithology of an area is the basic factor that controls the erosional. Capability of the exogenic processes principally by the action of the water. In order to investigate the intensity and the erosion that can be seen in every area we followed the following methodology. We prepared a series of maps at scale 1:50.000. These maps helped us to work out and analyze the factors that affected the configuration of the relief. These maps are relative to the lithology of the formations, as well as their behavior under the affect of the exogenic processes in connection with he morphological slope. The maps that we prepared can be divided into three groups: A map providing information about the lithology and hydrogeology. In this map, two areas are distinguished according to the behavior and resistivity to erosion. Maps providing geomorphological data due to the shape and the evolution of the drainage networks of the area. In order to investigate the drainage texture, drainage density and drainage frequency maps were prepared. In each of these maps, three different areas of density and frequency values were distinguished. A combination of these maps leads to a final map of the drainage texture in which two different areas can be distinguished. A map of the slope of the valley sides. According to the gradient values of the slopes, two areas were distinguished. One area with gradient of less than 12% and one of more than 12%. The value of 12% was considered as a marginal value. The combination of the three final maps, of drainage texture, relief slopes and lithologie areas susceptible to erosion produced the erosivity map. According to erosivity three different categories of areas were distinguished. As the map shows the larger part of the area belongs to the category of low erosivity. Finally due to investigate the erosivity under present conditions we combined the erosivity map with the vegetation cover map. It is appreciated that the erosivity of the formations whish are covered of forests is significantly protected from erosivity and decreased than those of uncultivated areas

APA, Harvard, Vancouver, ISO, and other styles

23

Castagna, John P. "Recent advances in seismic lithologic analysis." GEOPHYSICS 66, no. 1 (January 2001): 42–46. http://dx.doi.org/10.1190/1.1444918.

Full text

Abstract:

An objective of seismic analysis is to quantitatively extract lithology, porosity, and pore fluid content directly from seismic data. Rock physics provides the fundamental basis for seismic lithology determination. Beyond conventional poststack inversion, the most important seismic lithologic analysis tool is amplitude‐variation‐with‐offset (AVO) analysis. In this paper, I review recent progress in these two key aspects of seismic lithologic analysis.

APA, Harvard, Vancouver, ISO, and other styles

24

Sesiano, Jean. "Traçage entre le lac de Salanfe et les sources de Val d'Illiez (Valais, Suisse) : tectonique, lithologie et géothermie." Karstologia : revue de karstologie et de spéléologie physique 41, no. 1 (2003): 49–54. http://dx.doi.org/10.3406/karst.2003.2520.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Blondel, Thierry Jacques Alain, Chokri Yaich, and Danielle Decrouez. "La Formation Messiouta en Tunisie centrale (Miocène inférieur continental) : lithologie, sédimentologie et mise en place de cette formation." Géologie Méditerranéenne 12, no. 3 (1985): 155–65. http://dx.doi.org/10.3406/geolm.1985.1346.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Poutiers, Jacques, and Marianne Noel. "Relations entre des proprietes physiques (densite et susceptibilite magnetique) et la lithologie de sediments du Golfe de Gascogne." Bulletin de la Société Géologique de France I, no. 1 (January 1, 1985): 9–20. http://dx.doi.org/10.2113/gssgfbull.i.1.9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Berkhli, Mostafa, and Daniel Vachard. "Le Carbonifère du Maroc central : les formations de Migoumess, de Tirhela et d'Idmarrach. Lithologie, biostratigraphie et conséquences géodynamiques." Comptes Rendus Geoscience 334, no. 1 (January 2002): 67–72. http://dx.doi.org/10.1016/s1631-0713(02)01699-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Aloïsi, Jean-Claude, André Monaco, Nadine Planchais, Jean Thommeret, and Yolande Thommeret. "The Holocene transgression in the Golfe du Lion, southwestern France: Paleogeographic and paleobotanical evolution." Géographie physique et Quaternaire 32, no. 2 (January 25, 2011): 145–62. http://dx.doi.org/10.7202/1000346ar.

Full text

Abstract:

Starting from multidisciplinary punctual results, the authors offer a synthesis of lithologie seismic analysis, sedimentology, palynology and radiometrical measurements from sites in sea and at the border of the Golfe du Lion. The dated samples (more than 120) and the variety of the studied sites has permitted a true methodological approach. The authors also propose a curve of the rising of the Holocene sea that takes into account two major facts: the géomorphologie localisation of the site and the characteristics of the sedimentary environment (sedimentary facies and paleobotanic environment). They conclude to: 1) a generalised rapid rise of the transgression since 14,000 years BP, with an acceleration from 8000 to 6000 years BP; 2) intervals of relative stability from 12 000 to 8 000 years BP; 3) a high sea-level at +2 m at around 4500 years BP.

APA, Harvard, Vancouver, ISO, and other styles

29

Margaa, Khalid, and Ahmed Abdelgader. "Une méthodologie de cartographie des zones potentiellement instables Application à la région d'Al Hoceima (Maroc)." Canadian Geotechnical Journal 35, no. 3 (June 1, 1998): 460–70. http://dx.doi.org/10.1139/t98-019.

Full text

Abstract:

The Al Hoceima region presents several instability features. Some zones remain relatively stable, but others are subject to signs of instability factors or to active slides. The aim of this study is to establish the different instabilities mapping and to define, in hierarchic order, their potential risk. This work was conducted by selecting all factors influencing stability : geological, hydrogeological, and geotechnical parameters, thus we develop a zoning procedure that permits us to quantify the potential hazards.This study shows that major potential hazards zones are essentially caused by the presence of weak cohesive layers (clay) interbedded within other, mostly stronger, formations in addition to the steep slopes, the intense fracturing, and the presence of a high piezometric surface.Finally, our results are proved by comparison to others obtained from the ZERMOS and P.E.R. cartography modes.Key words: Rif-Maroc, lithologie, évaluation, instabilité, cartographie.

APA, Harvard, Vancouver, ISO, and other styles

30

Salomon, Jean-Noël. "Le sultanat d’Oman : un territoire d’exception pour l’étude de la tectonique des plaques et la géomorphologie." Cadernos de Geografia, no. 43 (June 30, 2021): 39–56. http://dx.doi.org/10.14195/0871-1623_43_3.

Full text

Abstract:

La pointe Nord-est de la plaque arabique et plus précisément le Sultanat d’Oman s’avère être un territoire d’exception pour comprendre les questions géologiques et géomorphologiques qui se posent aux scientifiques. Que ce soient les problèmes de la tectonique des plaques, des orogenèses (lithologie, structure, tectonique) ou des morphologies de surface (érosion fluviale, éolienne, littorale, karstogenèse, etc.) les parcours dans les montagnes d’Oman, ses canyons ou ses déserts se révèlent très instructifs. Parmi les intérêts principaux on soulignera la présence du plus vaste plancher océanique exondé au monde (site de Sémail), l’incision en canyons des terrains soulevés, un important karst méconnu et des déserts exceptionnels. Ces circonstances particulières ont également fait d’Oman un lieu de gisement miniers de métaux rares et hydrocarbures à la base d’une occupation humaine très ancienne et, avec le tourisme, de sa richesse actuelle.

APA, Harvard, Vancouver, ISO, and other styles

31

Bosch, Miguel. "Lithologic tomography: From plural geophysical data to lithology estimation." Journal of Geophysical Research: Solid Earth 104, B1 (January 10, 1999): 749–66. http://dx.doi.org/10.1029/1998jb900014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Landrein, Philippe, Georges Vigneron, Jacques Delay, Patrick Lebon, and Maurice Pagel. "Lithologie, hydrodynamisme et thermicité dans le système sédimentaire multicouche recoupé par les forages Andra de Montiers-sur-Saulx (Meuse)." Bulletin de la Société Géologique de France 184, no. 6 (November 1, 2013): 519–43. http://dx.doi.org/10.2113/gssgfbull.184.6.519.

Full text

Abstract:

AbstractDans le cadre du choix d’un site de stockage de déchets radioactifs de haute et moyenne activité à vie longue dans les argilites du Callovo-Oxfordien de Meuse/Haute-Marne, l’Andra (Agence nationale pour la gestion des déchets radioactifs) a réalisé 3 forages (EST431, EST432 et EST433) à partir d’une plate-forme implantée sur la commune de Montiers-sur-Saulx (Meuse) en position centrale d’une zone d’environ 250 km2 dite ≪ zone de transposition ≫.Les objectifs principaux des investigations ont été d’apporter des éléments pour la localisation du stockage potentiel et compléter les connaissances sur les formations encaissantes de la couche hôte (Dogger, Oxfordien carbonaté et Kimméridgien) mais également sur les formations profondes du Lias et du Trias. Plus précisément, ces derniers objectifs sont destinés à (i) acquérir une meilleure compréhension du fonctionnement global du système hydrogéologique et des échanges verticaux entre les formations et (ii) d’évaluer les ressources géothermiques potentielles sur la zone.Au-delà des objectifs liés aux problématiques de l’Andra, le forage le plus profond (EST433) a été échantillonné et étudié par plusieurs équipes de recherche associées dans le programme TAPSS (Transferts actuels et passés dans un système sédimentaire aquifère – aquitard) afin de répondre à des problématiques qui leur étaient propre. Cet article présente les données nécessaires à l’interprétation des données acquises par ces équipes et à la publication de leurs travaux.Les trois forages ont majoritairement été forés en destructif à l’exception du Kimméridgien marneux et du toit de l’Oxfordien carottés de 141 à 264 m de profondeur, du Callovo-Oxfordien et du sommet du Dogger carottés de 526 m à 770 m de profondeur. Certains horizons du Lias et du Trias ont également été carottés ponctuellement. De nombreuses diagraphies ont été réalisées entre les phases de forage ainsi que deux diagraphies thermiques 9 mois après le forage. La concaténation des données issues des trois forages a permis d’établir le log stratigraphique de la série du Tithonien au toit de l’Olénékien.Les informations du forage profond EST433 améliorent la connaissance de l’épaississement progressif de la couche du Callovo-Oxfordien vers le nord-est de la zone de transposition ainsi que la constance lithologique de celle-ci tant en vertical qu’en horizontal. Les perméabilités mesurées dans cette formation sont du même ordre de grandeur que celles observées dans les autres forages de la zone de transposition. Dans le Dogger, les variations de la perméabilité de certains niveaux sont liées aux environnements de dépôt. Les formations du Lias et du Trias sont conformes à celles dé-duites des forages antérieurs à l’exception des Marnes irisées inférieures (Keuper inférieur) plus épaisses que prévues. Les profils sismiques et les corrélations entre forages montrent l’existence d’une gouttière à l’aplomb du forage EST433 où les formations du Keuper (Carnien et Norien) sont plus épaisses. Les résultats du forage EST433 montrent également que les faciès du Lias et du Trias supérieur et moyen sont très peu poreux et que seule la base du Trias moyen (toit du Buntsandstein) contient des niveaux aquifères. Mille mètres de série sans porosité notable séparent l’aquifère du Dogger de celui du Trias inférieur.L’aquifère supérieur du Buntsandstein présente en test, entre 1862 et 1887 m de profondeur, une production d’eau à 66°C avec une salinité d’environ 180 g/l. La transmissivité calculée pour cet intervalle est de 1,1 10−3 m2/s. En comparaison avec les installations géothermiques exploitant l’aquifère du Dogger en région parisienne, la température mesurée sur EST433 est de l’ordre des températures exploitées les plus basses, la salinité nettement plus élevée (6,5 à 35 g/l en région parisienne) et la transmissivité du même ordre. Ces caractéristiques ne présentant pas un caractère exceptionnel (en termes de ressource potentielle pour une exploitation géothermique) associées au caractère argilo-gréseux de l’aquifère pouvant influer négativement sur la productivité d’un ouvrage ne font pas du Buntsandstein une ressource géothermique attractive dans les conditions technologiques et économiques actuelles.

APA, Harvard, Vancouver, ISO, and other styles

33

Dickinson, Jesse E., D. R. Pool, R. W. Groom, and L. J. Davis. "Inference of lithologic distributions in an alluvial aquifer using airborne transient electromagnetic surveys." GEOPHYSICS 75, no. 4 (July 2010): WA149—WA161. http://dx.doi.org/10.1190/1.3464325.

Full text

Abstract:

An airborne transient electromagnetic (TEM) survey was completed in the Upper San Pedro Basin in southeastern Arizona to map resistivity distributions within the alluvial aquifer. This investigation evaluated the utility of 1D vertical resistivity models of the TEM data to infer lithologic distributions in an alluvial aquifer. Comparisons of the resistivity values and layers in the 1D resistivity models of airborne TEM data to 1D resistivity models of ground TEM data, borehole resistivity logs, and lithologic descriptions in drill logs indicated that the airborne TEM identified thick conductive fine-grained sediments that result in semiconfined groundwater conditions. One-dimensional models of ground-based TEM surveys and subsurface lithology at three sites were used to determine starting models and constraints to invert airborne TEM data using a constrained Marquardt-styleunderparameterized method. A maximum structural resolution of six layers underlain by a half-space was determined from the resistivity structure of the 1D models of the ground TEM data. The 1D resistivity models of the airborne TEM data compared well with the control data to depths of approximately [Formula: see text] in areas of thick conductive silt and clay and to depths of [Formula: see text] in areas of resistive sand and gravel. Comparison of a 3D interpolation of the 1D resistivity models to drill logs indicated resistive (mean of [Formula: see text]) coarse-grained sediments along basin margins and conductive (mean of [Formula: see text]) fine-grained sediments at the basin center. Extents of hydrologically significant thick silt and clay were well mapped by the 1D resistivity models of airborne TEM data. Areas of uncertain lithology remain below conductive fine-grained sediments where the 1D resistivity structure is not resolved: in areas where multiple lithologies have similar resistivity values and in areas of high salinity.

APA, Harvard, Vancouver, ISO, and other styles

34

Παπανικολάου, Δ. I., Σ. Γ. Λόζιος, K. Ι. Σούκης, and Εμ Ν. Σκούρτσος. "THE GEOLOGICAL STRUCTURE OF THE ALLOCHTHONOUS "ATHENS SCHISTS"." Bulletin of the Geological Society of Greece 36, no. 4 (January 1, 2004): 1550. http://dx.doi.org/10.12681/bgsg.16513.

Full text

Abstract:

Based on lithological fades, deformation and metamorphic degree the alpine tectonostratigraphic complex known in the literature as "Athens Schists" is divided into two units: the non-metamorphosed overlying Athens Unit and the very low grade metamorphosed underlying Alepovouni Unit. Athens Unit crops out in several hills of the western and central part of the Athens Basin emerging through the post-alpine sediments. It comprises several lithologies that constitute two lithologie groups: the first one of neritic white massive-to thick-bedded carbonates that bear rudist fragments and Upper Cretaceous foraminifera. These limestones are olistholites within the second pelagic formation comprising marly limestones with Globotruncana sp., shales, sandstones, tuffs and ophiolithic blocks. Due to tectonic intercalating of these two lithological groups Athens Unit shows a complex internal structure. It represents an Upper Cretaceous mélange formed in an accretionary prism. Alepovouni Unit is observed at the eastern part of the Athens Basin along the foothills of Mt. Hymettos, wedged between Athens Unit and the metamorphic rocks of Mt. Hymettos. It comprises two lithological groups, in which remnants of Thassic fossils were reported. Alepovouni Unit is correlated to the allochthonous Lavhon Unit that tectonically overlies the autochthonous Attica Unit in SE Attica. At the eastern part of the Athens Basin, Alepovouni Unit is bounded by two west-dipping lowangle normal faults. Along these contacts the formations of both Athens and Alepovouni Units exhibit microstructures indicating top-to NW sense of shear. The contact between the Athens Unit and Alepovouni Unit in western Hymettos is probably a major extensional detachment separating the metamorphic units of Attica autochthon and Alepovouni at the footwall to the SE from the nonmetamorphic units of the Sub-Pelagonian and the Athens unit at the hangingwall to the NW. This major detachment fault accommodated the uplift of the metamorphic rocks and juxtaposed these two units. At the western part Athens Unit overlies tectonically the Paleozoic - Mesozoic formations of the Sub-Pelagonian unit. The contact is an east-dipping normal fault, antithetic to the major detachment of western Hymettos.

APA, Harvard, Vancouver, ISO, and other styles

35

Han, Meng, and Xiao Yi Fan. "The Evaluation of Lithology Effects on Wenchuan Seismic Landslides." Applied Mechanics and Materials 166-169 (May 2012): 2483–89. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.2483.

Full text

Abstract:

The landslides caused serious casualties and property losses in Wenchuan earthquake, China. According to the survey data of the landslides, the landslide lithology, contribution rate of lithology, height difference and volume of the landslides were studied. The results indicated that the 13 lithologies had the larger relationship with seismic landslide development. In these lithologies, The Phyllite (Ph) had the greatest contribution rate on the landslide number, landslide area and landslide volume. The Stone soil (Ss) had the largest volume of landslide on unit landslide area. Metamorphic sandstone (Ms), Gravelly soil (Gs), Sandstone (Sa), Phyllite (Ph), Limestone (Li) had the greater combined effects on the landslide development.

APA, Harvard, Vancouver, ISO, and other styles

36

Bailey, Brooks, Weston Drip, and Suresh Muthukrishnan. "Spatial Analysis of Hydrological Productivity in Fractured Bedrock Terrains of the Piedmont of Northwestern South Carolina." Journal of South Carolina Water Resources, no. 5 (June 1, 2018): 25–33. http://dx.doi.org/10.34068/jscwr.05.02.

Full text

Abstract:

Fractured bedrock aquifers are structurally complex groundwater systems. Groundwater flow is limited to secondary porosity features such as faults and fractures on account of the low primary porosity and permeability of the native bedrock. The hydrologic productivity of wells drilled within these systems is spatially and vertically variable because of limited interconnectivity among these features. The purpose of this study was to assess potential correlations between driller-estimated well yields and the mapped lithology and structural features of the fractured bedrock aquifers of the Piedmont of northwestern South Carolina. Groundwater well data (e.g., well depth, well yields, static water level) of 1,069 wells, geologic data (e.g., lithology, mapped structural features), and topographic data (e.g., surface elevation, slope) were integrated within a geographic information system database for a spatial analysis of well yield distribution. Wells drilled in alluvium had the highest median yield (15 gal/min), whereas those drilled in schist, amphibolite, and gneisses had lower median yields (9, 8.5, and 8 gal/min, respectively). Nonparametric statistical analyses indicated that no geologic or topographic variables considered were strongly or moderately correlated with reported well yields. Spearman’s correlation coefficients for well depth (0.24), static water level (0.19), proximity to water bodies (–0.10), and proximity to lithologic contacts (–0.08) were statistically significant (at the 0.05 confidence level) but only weakly correlated with well yield. Topographic variables and proximity to mapped faults were not statistically significant. Wells drilled in alluvium had the highest yields due to the higher porosity and permeability compared to the bedrock. However, alluvium makes up less than 5% of the study area surface, and so opportunities to further tap this unit are limited and spatially constrained. The lower median yields of other lithologies are attributed to the lack of fracture development in amphibolite and the low degree of weathering within gneiss foliation planes. To maximize yields, wells should be drilled in alluvium close to water bodies and lithologic contacts where possible.

APA, Harvard, Vancouver, ISO, and other styles

37

Ek, Camille, Claude Hillaire-Marcel, and Benoît Trudel. "Sédimentologie et paléoclimatologie isotopique dans une grotte de Gaspésie, Québec." Géographie physique et Quaternaire 35, no. 3 (February 2, 2011): 317–28. http://dx.doi.org/10.7202/1000542ar.

Full text

Abstract:

La grotte appelée Spéos de la Fée est creusée dans les calcaires siluriens à l’ouest du lac Matapédia. Sa morphologie actuelle, essentiellement due à l’eau courante, est cependant influencée par des effondrements à proximité des deux entrées. La galerie principale est une conduite forcée suivant le pendage des bancs. Dans cette galerie, des dépôts d’eau courante (limons et sables fins) sont surmontés d’un diamicton comportant des cailloux de lithologie variée, parmi lesquels des éléments calcaires striés. Les compositions isotopiques de la fraction carbonatée des sédiments (δ13C et δ18O) indiquent qu’il s’agit surtout de carbonates hérités du socle. Une stalactite, datée à 7355 ± 190 BP (UQ-101), a fait l’objet d’analyses sériées des teneurs en 13C et en 18O, qui ont été comparées aux compositions isotopiques du CO2 et de l’eau actuels de la grotte. On peut en conclure que les précipitations carbonatées (δ13C ≈ – 6‰ et δ18O ≈ 10‰) s’effectuent en équilibre, dans un eau provenant surtout de la fonte des neiges. Les teneurs en 18O des concrétions reflètent ainsi celles des précipitations hivernales.

APA, Harvard, Vancouver, ISO, and other styles

38

Zhang, Mei Ling, Bo Wen Zhou, Jian Hua Lin, and Feng Lin Yu. "Achieving the Logging Item’s Sensitive Analysis of Complex Lithology by Using the Cross Plot Technique." Advanced Materials Research 734-737 (August 2013): 269–75. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.269.

Full text

Abstract:

It is difficult to discriminate the lithology of complex lithological profile which contains lava, terrigenous sedimentary rock and volcanic transitional lithology by using conventional logging curves. Attributing to different kinds of lithology, different logging items have different reflecting abilities. Based on the 500 Hailar Basin complex lithology samples, we’ve made logging response cross plots of resistivity and radioactive curves, porosity and resistivity curves, porosity curves and radioactive curves to identify the sensitive feature of logging response among different lithologies. The research provides the basis for fine evaluation of complex lithology profile by using the well logging data.

APA, Harvard, Vancouver, ISO, and other styles

39

Ming, Yan Fang, and Li Yang. "The Methods of Mapping Lithology with AVIRIS Data." Advanced Materials Research 955-959 (June 2014): 3879–82. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.3879.

Full text

Abstract:

A hyper-spectral remote sensing instrument AVIRIS was used to map lithology. Ground measurement data of lithology from ASTER Spectral Library were used to analyze the characters of the spectrum and form the model to estimate the type of lithologies. we process the spectrum with the methods of spectral angle mapping, and spectral absorption index etc. To enhance the significance of the spectrum character, we used the methods of spectral angle mapping, and spectral absorption index etc to process the spectrum. An AVIRIS data covers the Cuprite mining district in western Nevada, USA was used to do the experiment, result shows that the lithologies got from the AVIRIS have a high consistence with groud measurement.

APA, Harvard, Vancouver, ISO, and other styles

40

CAO, WENCHAO, SIMON WILLIAMS, NICOLAS FLAMENT, SABIN ZAHIROVIC, CHRISTOPHER SCOTESE, and R. DIETMAR MÜLLER. "Palaeolatitudinal distribution of lithologic indicators of climate in a palaeogeographic framework." Geological Magazine 156, no. 2 (March 12, 2018): 331–54. http://dx.doi.org/10.1017/s0016756818000110.

Full text

Abstract:

AbstractWhether the latitudinal distribution of climate-sensitive lithologies is stable through greenhouse and icehouse regimes remains unclear. Previous studies suggest that the palaeolatitudinal distribution of palaeoclimate indicators, including coals, evaporites, reefs and carbonates, has remained broadly similar since the Permian period, leading to the conclusion that atmospheric and oceanic circulation control their distribution rather than the latitudinal temperature gradient. Here we revisit a global-scale compilation of lithologic indicators of climate, including coals, evaporites and glacial deposits, back to the Devonian period. We test the sensitivity of their latitudinal distributions to the uneven distribution of continental areas through time and to global tectonic models, correct the latitudinal distributions of lithologies for sampling- and continental area-bias, and use statistical methods to fit these distributions with probability density functions and estimate their high-density latitudinal ranges with 50% and 95% confidence intervals. The results suggest that the palaeolatitudinal distributions of lithologies have changed through deep geological time, notably a pronounced poleward shift in the distribution of coals at the beginning of the Permian. The distribution of evaporites indicates a clearly bimodal distribution over the past ~400 Ma, except for Early Devonian, Early Carboniferous, the earliest Permian and Middle and Late Jurassic times. We discuss how the patterns indicated by these lithologies change through time in response to plate motion, orography, evolution and greenhouse/icehouse conditions. This study highlights that combining tectonic reconstructions with a comprehensive lithologic database and novel data analysis approaches provide insights into the nature and causes of shifting climatic zones through deep time.

APA, Harvard, Vancouver, ISO, and other styles

41

Liu, Wei Fu, Shuang Long Liu, and Li Xin Sun. "Identify Carbonate Lithology by Fuzzy Mathematics." Advanced Materials Research 912-914 (April 2014): 532–35. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.532.

Full text

Abstract:

In accordance with low success ratio of lithology identification in carbonate formation, a made of Identifying lithology of carbonate rocks through fuzzy mathematics has set up. 8 logging parameters reflecting lithology of carbonate rocks were selected and threshold values were determined. Lithologies of carbonate rocks were classified by using this identification mode and maximum subordination principle. Using field data identified 10 types of carbonate rocks, and they were compared with the result of core analysis, showing 85 % consistency. Therefore this method has higher accuracy for identification of carbonate lithology, and is quite promising in geological application.

APA, Harvard, Vancouver, ISO, and other styles

42

Shao, Bi Lin, Qiong Wu, and Li Qing Wang. "Construction and Application of 3D Model Based on the Lithologic Characteristics of Ore." Applied Mechanics and Materials 336-338 (July 2013): 1406–11. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.1406.

Full text

Abstract:

Based on the 3D mine software platform and aimed at optimizing the ore blending process,according to the different lithological features of Molybdenum and Tungsten in Sandaozhuang open pit,the data integration of storage,update and management in different maps,images,tables,lithology was realized.Using the lithologic database and human-computer interaction technology,the complex lithology profile of exploration line has been drawn,and based on the technology of triangulation,the lithology model of skarn, hornfels, quartzite has been established. The construction shows that this model can provide theoretical basis and data foundation for ore blending method of lithology.

APA, Harvard, Vancouver, ISO, and other styles

43

Gu, Xin Ping, Zhong Hong Chen, Ming Zha, Yu Hua Kong, Ru Feng Jiang, and Meng Yun Yang. "Identification of Complex Ancient Volcanic in Carboniferous, Northern Xinjiang." Applied Mechanics and Materials 295-298 (February 2013): 2720–25. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2720.

Full text

Abstract:

Based on recent exploration of Carboniferous volcanic of Kelameili gas field in Junggar Basin, northern Xinjiang, a series of technology have been formed to identify lithology and lithofacies of complex ancient volcanic. Carboniferous volcanic types in this gas field are complicated and diversified; the identical lithology is different in texture, structure and component, as well as relevant typical characteristics, making it hard to identify lithology and lithofacies. According to the observation from 16 wells in Ludong area with 92 tubes of cores, 235 typical pictures and 631 sections, the article denominated the volcanic lithology. The lithologic and electric relationship of volcanic were built by the data of cores, sections and calibration logging, which laid a foundation for building the volcanic lithologic-electric plate. Density-gamma crossplot, acoustic-gamma crossplot and resistivity-gamma crossplot in Ludong area are made, and several complex volcanic types are identified, such as rhyolites, basalts, basaltic volcanic breccias, andesites and andesitic firing breccias. Through logging-seism-combined identification technology of volcanic lithofacies, the seismic properties of different volcanic types are distinguished, finally the distribution of explosive facies, outflow facies and volcanic sendimentary facies are divided both on plane and profile.

APA, Harvard, Vancouver, ISO, and other styles

44

Kolbjørnsen, Odd, Arild Buland, Ragnar Hauge, Per Røe, Abel Onana Ndingwan, and Eyvind Aker. "Bayesian seismic inversion for stratigraphic horizon, lithology, and fluid prediction." GEOPHYSICS 85, no. 3 (March 25, 2020): R207—R221. http://dx.doi.org/10.1190/geo2019-0170.1.

Full text

Abstract:

We have developed an efficient methodology for Bayesian prediction of lithology and pore fluid, and layer-bounding horizons, in which we include and use spatial geologic prior knowledge such as vertical ordering of stratigraphic layers, possible lithologies and fluids within each stratigraphic layer, and layer thicknesses. The solution includes probabilities for lithologies and fluids and horizons and their associated uncertainties. The computational cost related to the inversion of large-scale, spatially coupled models is a severe challenge. Our approach is to evaluate all possible lithology and fluid configurations within a local neighborhood around each sample point and combine these into a consistent result for the complete trace. We use a one-step nonstationary Markov prior model for lithology and fluid probabilities. This enables prediction of horizon times, which we couple laterally to decrease the uncertainty. We have tested the algorithm on a synthetic case, in which we compare the inverted lithology and fluid probabilities to results from other algorithms. We have also run the algorithm on a real case, in which we find that we can make high-resolution predictions of horizons, even for horizons within tuning distance from each other. The methodology gives accurate predictions and has a performance making it suitable for full-field inversions.

APA, Harvard, Vancouver, ISO, and other styles

45

Entacher, Martin, and Klaus Lassnig. "Findings from disc cutting tests on alpine lithologies / Erkenntnisse aus Diskenschneidversuchen an alpinen Lithologien." Geomechanics and Tunnelling 5, no. 5 (October 2012): 547–56. http://dx.doi.org/10.1002/geot.201200041.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Kourkounis, S., A. Zelilidis, O. Panagiotakopoulou, and N. Kontopoulos. "TEXTURE VERSUS DISTANCE OF TRAVEL OF GRAVELS ON A STREAM BED: A CASE STUDY FROM FOUR STREAMS IN NW PELOPONNESE, GREECE." Bulletin of the Geological Society of Greece 43, no. 2 (January 23, 2017): 643. http://dx.doi.org/10.12681/bgsg.11227.

Full text

Abstract:

This study concerns the change of lithology, grain size and roundness of gravels with distance downstream in lowland area from four streams which are Krathis, Kerinitis, Meganitis and Finikas. Four types of gravelly clast lithology were collected: limestone, chert, sandstone and conglomerate. In Krathis stream, the absence of variability in lithologic content is due to a short travel. The variability of the arithmetic mean depends on the width of stream channel. The roundness either remains constant or becomes better downstream because of selective transport. In Kerinitis stream, the variability or the invariability in the lithologic content is due to partly or local sample variation, partly to influx of new material, and partly to effects of increase or decrease of other types. The arithmetic mean and roundness either remain constant or are decreased downstream due to the contamination and the short travel. In Meganitis Stream, the lithologic content shows variability, the arithmetic mean absence of downstream fining gravel and the roundness variability or invariability because of the contamination and gravel mining. In Finikas Stream, the lithological content, the arithmetic mean and the roundness show either variability or invariability because of the gravel mining.

APA, Harvard, Vancouver, ISO, and other styles

47

Knight, Rosemary, Jack Dvorkin, and Amos Nur. "Acoustic signatures of partial saturation." GEOPHYSICS 63, no. 1 (January 1998): 132–38. http://dx.doi.org/10.1190/1.1444305.

Full text

Abstract:

The relationship between elastic wave velocities and water saturation in a water/gas reservoir depends strongly on whether saturation is heterogeneous (patchy) or homogeneous. Heterogeneity in saturation may result from lithologic heterogeneity because under conditions of capillary equilibrium, different lithologies within a reservoir can have different saturations, depending on their porosities and permeabilities. We investigate this phenomenon by generating models of a reservoir in which we control the distribution of lithologic units and theoretically determine the corresponding velocity‐saturation relationship. We assume a state of capillary equilibrium in the reservoir and determine the saturation level of each region within the reservoir from the corresponding capillary pressure curve for the lithologic unit at that location. The velocities we calculate for these models show that saturation heterogeneity, caused by lithologic variation, can lead to a distinct dependence of velocity on saturation. In a water‐gas saturated reservoir, a patchy distribution of the different lithologic units is found to cause P-wave velocity to exhibit a noticeable and almost continuous velocity variation across the entire saturation range. This is in distinct contrast to the response of a homogeneous reservoir where there is only a large change in velocity at water saturations close to 100%.

APA, Harvard, Vancouver, ISO, and other styles

48

Dionne, Jean-Claude, and Stephen Poitras. "Lithologie des cailloux de la baie de Mitis, rive sud de l’estuaire maritime du Saint-Laurent (Québec) : un exemple de transport glaciaire et glaciel complexe." Géographie physique et Quaternaire 52, no. 1 (October 2, 2002): 107–22. http://dx.doi.org/10.7202/004791ar.

Full text

Abstract:

Résumé Dans la baie de Mitis, les cailloux des dallages et des cordons sur la batture argileuse ainsi que sur la plate-forme rocheuse comprenent 40 % de précambriens, 25,8 % de grès, 18,3 % de schistes argileux, 11,5 % de calcaires, 3,6 % de quartzites et 0,8 % de conglomérats. Cette moyenne est basée sur 52 comptages totalisant 29 932 blocs. Parmi les précambriens, les anorthosites, une lithologie exclusive au Bouclier laurentidien, comptent pour 0,8 %. Dans la catégorie des schistes argileux, il y a 1,6 % d'ardoises rouges.On a aussi trouvé plusieurs calcaires coralliens ainsi que des dolomies. Les cailloux précambriens semblent tous provenir du Bouclier laurentidien, sur la rive nord de l'estuaire, à plus de 55 km de distance, alors que les cailloux sédimentaires appartiennent aux formations cambroordoviciennes de la bande côtière de la rive sud et aux formations siluriennes localisées à plus de 35 km au SE de la baie de Mitis.En dehors des cailloux d'origine locale ou proximale, tous les autres ont été déplacés sur des distances de plusieurs dizaines de kilomètres, voire même plus de 100 km dans certains cas, par les glaces appalachiennes et laurentidiennes avec relais glaciel évident, compte tenu que l'essentiel des cailloux proviennent de formations argileuses de la Mer de Goldthwait. Cette étude met en évidence la contribution substantielle des icebergs durant la première partie de l'Holocène.

APA, Harvard, Vancouver, ISO, and other styles

49

Asslouj, Jaouad El, Sanae Kholtei, Namira El Amrani-Paaza, and Abderrauf Hilali. "Impact des activités anthropiques sur la qualité des eaux souterraines de la communauté Mzamza (Chaouia, Maroc)**." Revue des sciences de l'eau 20, no. 3 (October 1, 2007): 309–21. http://dx.doi.org/10.7202/016505ar.

Full text

Abstract:

Résumé L’étude des caractéristiques physico-chimiques des eaux souterraines de la communauté Mzamza, soumises aux rejets liquides de la ville de Settat à partir de l’oued Boummoussa, montre que la qualité des eaux des différents puits est variable et dépend d’un certain nombre de facteurs tels que l’emplacement des puits par rapport aux eaux usées et l’activité agricole. L’interprétation des données d’analyse, la corrélation existante entre eaux usées et eaux de puits, et la répartition des eaux souterraines en groupes sont réalisées en utilisant l’Analyse en Composante Principale Normée. L’étude a révélé des origines différentes de la contamination des eaux souterraines, à savoir, la contamination par la matière organique due essentiellement à l’utilisation des eaux usées à des fins d’irrigation et à leur infiltration continue, et finalement le retour des eaux d’irrigation (chargées en engrais azotés) qui est considéré comme étant la principale origine de la minéralisation et de la pollution des eaux. Plusieurs facteurs conditionnent la progression de cette pollution : les concentrations des polluants dans les eaux usées, la nature des sols, la lithologie, la perméabilité de l’aquifère exploité et la profondeur de la nappe. Les résultats acquis dans cette étude font ressortir également l’influence primordiale des variations saisonnières, ainsi que le rôle bénéfique des précipitations.

APA, Harvard, Vancouver, ISO, and other styles

50

ΛΕΙΒΑΔΊΤΗΣ, Γ., and Α. ΑΛΕΞΟΥΛΗ-ΛΕΙΒΑΔΙΤΗ. "Geomorphology of the island of Tinos." Bulletin of the Geological Society of Greece 34, no. 1 (January 1, 2001): 389. http://dx.doi.org/10.12681/bgsg.17041.

Full text

Abstract:

Morphology of Tinos Island is controlled mainly by lithology and tectonics. A significant factor is also the climate; the very high humidity and the strong winds of NNE directions. These special climate characteristics cause intense chemical alteration and cellular weathering at schists and granodiorites. The relief is fairly mountainous. Mt. Tsiknias in the south is the highest mountain (725m). In the central part of the island there are Mesovouni (647m) and Prasa (614m). The slopes of the valley-sides vary a lot depending mainly on the original dip. The relief is smooth while slopes of 15-45% comprise 73% of the island. Three morphological units with different relief type can be distinguished, that results from lithological differences and the type of erosion. The first unit covers the larger part of the island and consists of mica-schists with marble intercalation. The second unit is observed at the mountains Tsiknias, Vouno and Marias. It consists of green schist, clorittalkschists. It is characterized generally of smooth relief with acute notched peaks and Tafoni. The third unit comprises the area of the plutonic rocks. It is characterized by dispersed rounded bulks of granite and spheroidal weathering. Petrologie examination showed biotitic-monzogranit in the area Steni-Volax and biotitic-granodiorit in Livada. In the spherical bulks of Livada Tafoni are created. The spheroidal weathering is owed to chemical processes. The weathered mantle was identified sericitization. The island is crossed by a watershed, which is parallel to the long axis of the island trending NW-SE, and separates the island in two asymmetric parts. The watershed is coincided to the axis of the folds. Pianation surfaces are observed at 100m, 200m, 300- 350m, 410-430m and at 600m. The topographic slopes along the coasts of Tinos present a wide range of values. The slopes of the coasts of the 500m cross-sectional coastal zone, are higher of those of the 1000m one. Clear relation between the slopes of these zones and the corresponding lithologie formations is not observed. It is believed that the main factors which controls the slope morphology of the coastal zone is the tectonic and the weathering.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Lithologie'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles