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Journal articles on the topic 'Euler Deconvolution and Hydrocarbon accumulation'
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S.A, Ajala, Salako K. A, Rafiu A. A, Alahassan U. D, Adewumi T, and Sanusi Y.A. "ESTIMATION OF SEDIMENTARY THICKNESS FOR HYDROCARBON POTENTIAL OVER PART OF ADAMAWA TROUGH, NE NIGERIA USING MAGNETIC METHOD." Earth Sciences Pakistan 5, no. 1 (2021): 01–05. http://dx.doi.org/10.26480/esp.01.2021.01.05.
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This study presents the results of the analysis and interpretation of aeromagnetic data over part of Adamawa trough with the aim of investigating the hydrocarbon potential of the study area. The study area is located between latitude 8.50oN and 9.50oN and longitudes 11.50oE and 12.50oE. The Total magnetic intensity map of the study area was subjected to regional/residual separation. Three depth estimating techniques applied on the residual map to determine the thickness of sediments in the study area were Source parameter imaging, Euler deconvolution and spectral method. The results of these methods corroborate; the SPI, Euler Deconvolution and Spectral method shows a thick sedimentation of 4.42 km, 4.20 km and 4.17 km at the north-eastern part of the study area respectively. The SPI, Euler deconvolution and the Spectral method reveal shallow depth of 0.06 km, 0.10 km and 0.42 km at the southeast, southern and southwest part of the study area respectively. The maximum sedimentary thickness of above 4 km obtained in this study at the north-eastern part of the study area which corresponds to Numal might be sufficient for hydrocarbon maturation and accumulation. The study area was found to have a good prospect for hydrocarbon exploration.
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Ndubuisi, Egwuonwu, Gabriel, Ibe, Stephen Onyejiuwaka, Ejike, Kingsley Nnaemeka, Orji Obinwa, and Ombu Righteous Emmanuel. "Investigation of the Gravity Anomalies within Brass and Environs, Niger Delta Area, Nigeria: Implications for Hydrocarbon Prospectivity." International Journal of Research and Innovation in Applied Science VIII, no. VI (2023): 45–56. http://dx.doi.org/10.51584/ijrias.2023.8606.
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The airborne gravity data over Brass Area and environs, Niger Delta Area, Nigeria were processed and interpreted in order to delineate the sedimentary thickness within the basin and map out places with the potentials for hydrocarbon formation, accumulation and migration. The geological structures, depths andstructural trends within the area were investigated using Total Horizontal Gradient, Tilt Derivative, Analytical Signal Filters and Euler Deconvolution techniques. The results from Euler depths showed that the sedimentary thickness and structural depths within the area range from about 1.6 to over 17.4 km.The area predominantly has NE-SW structural trend with minor NW-SE trend.The sediment thickness and structural endowment of the area prompted the classification of Egeregere, Brass, Spiff Town, Kirikakiri Areas in the northern and the southern partsof the area as zones of very viable potentials for hydrocarbon generation, accumulation and migration.
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Ali, I., F. Edino, K. O. Ibrahim, I. O. Folorunso, and L. M. Johnson. "AEROMAGNETIC MAPPING OF BASINAL STRUCTURES OVER PART OF NIGER DELTA, AND ITS IMPLICATION FOR HYDROCARBON MIGRATION AND ACCUMULATION." Continental J. Earth Sciences 7, no. 1 (2012): 48–56. https://doi.org/10.5281/zenodo.833427.
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Aeromagnetic imaging over part of Niger Delta was carried out with a view to interpret the anomalies over the areand to equally delineate the structural features suitable for hydrocarbon accumulation within the study area.econd vertical derivative, first horizontal derivative and analytic signal were applied to enhance deep seated structures.The derivative maps revealed parallel to sub-parallel trending NE-SW fracture zones in the basement underlying the study area, coinciding with the landward extension of the deep oceanic Chain and Charcot fracture zones. Hence, the identified lineaments (faults or lithologic contacts) and structures in the area can be attributed to the tectonic setting of the area and probable migratory routes for hydrocarbon migration.
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Akor Yakubu, John, Friday Egbunu, Ngozi Agatha Okwesili, Igwe Emmanuel Awucha, and Ngozi Mariam Rita Ossai. "GEOPHYSICAL INVESTIGATION OF IWO AND ILESHA, OSUN STATE USING HIGH RESOLUTION AEROMAGNETIC DATA." Geological Behavior 7, no. 2 (2023): 69–74. http://dx.doi.org/10.26480/gbr.02.2023.69.74.
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The study deals with the Geophysical investigation of Iwo and Ilesha, Osun State, using aeromagnetic data. Qualitative as well as quantitative interpretation of the aeromagnetic data were carried out to obtain more information about the thickness of sedimentary basins. Two methods were used in the interpretation; there are Euler deconvolution method and source parameter imaging (SPI). Oasis Montaj software was employed in the analysis, the Magnetic intensity ranges from a minimum value of -22.7 nT to a maximum value of 110.4 nT, this indicate that the area is characterised with low and high magnetic signature and could be as a result of difference in magnetic susceptibility, depth and the nature of the magnetic anomalous bodies present. The depth for magnetic source ranges from 187.6 to 1005.5 m using parameter imaging (SPI).Using Euler deconvolution method, the depth estimation for structural index (SI = 0.5, 1.0, 1.5) ranges from 300 m to 25481m, 262.9m to 1826.2m and 391.0m to 3243.6m respectively. The results obtained indicate shallow depths to magnetic anomalies which may not be suitable for hydrocarbon accumulation.
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Halidou Amadou, Abdourhamane, Driss El Azzab, and Abdel Ali Chaouni. "CONTRIBUTION OF AEROGRAVITY DATA INTERPRETATION TO THE STUDY OF THE DEEP STRUCTURE OF AGADEM PETROLEUM BLOCK (NIGER)." Geodesy and cartography 49, no. 3 (2023): 157–65. http://dx.doi.org/10.3846/gac.2023.17299.
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The main information provided by gravity maps is the geographical distribution of density heterogeneities in the subsurface. It is an important tool widely used for the mapping of geological structures, especially in the oil industry. Thus, this study based on the interpretation of aerogravity data has for objective, the qualitative description of the characteristics of the gravity anomalies of the study area, interpretation and mapping of the gravity lineaments as well as their depths, knowing that the lineaments constitute potential structural traps favorable to the accumulation of the hydrocarbons. Methods such as horizontal derivative, upward continuation and Euler deconvolution are used to give a geological signifiance to the different anomalies and to highlight deep structures. Thus, the analysis of the residual anomaly map revealed elongated negative and positive anomaly zones, oriented globally NW-SE, considered respectively as horst and graben zones. Gravity lineaments, considered as normal faults, are mapped using the horizontal gradient method. Finally, the depths of the density contrasts are estimated by the Euler deconvolution calculation using the value “1” as structural index. The depths thus determined are highly variable. The shallowest depths vary between 3000 m and 6000 m, while the deepest depths reach 18000 m.
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Essam, Aida, Abdullah Mahmoud El-Sayed, and Ahmad Sobhy Helaly. "Evaluation of tectonic trends affecting hydrocarbon accumulation of El-Obaiyed Field, Bir Fouad area, Egypt, using gravity and dipmeter data." Leading Edge 44, no. 4 (2025): 300–309. https://doi.org/10.1190/tle44040300.1.
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Bir Fouad is a significant region in the Western Desert of Egypt. It includes El-Obaiyed Field, which is considered the main Jurassic gas and condensate asset for the Shell-BAPETCO organization in the north part of the Western Desert. This field is strategically important due to its major contribution to Egypt's oil production. The purpose of the gravity data is to use disturbances in earth's gravitational field at the surface to outline the subsurface structures (faults) and determine the depth of the basement as the base of the planning area. The Bouguer gravity anomaly map was separated into regional (deep sources) and residual (shallow sources). Additionally, mathematical edge enhancement filters such as total horizontal derivative, tilt angle, and analytic signal were applied to the Bouguer data utilizing the vertical and horizontal derivatives to delineate the structural framework. Euler deconvolution and source parameter imaging methods were employed to estimate the depth of gravity sources and trends of structural elements. The gravity interpretation indicates that the main tectonics affecting the study area have east–west, east-northeast–west-southwest, west-northwest–east-southeast, northeast–southwest, and northwest–southeast trends, whereas the minor structures are aligned in north–south, north-northeast–south-southwest, and north-northwest–south-southeast trends. The results of depth estimation from applying 2D and 3D modeling, along with the available geologic information (the total depth and density logs for the available wells) illustrate a detailed basement structure map showing the basement configuration. The map reveals that the central and northwestern parts of the investigated area have shallower basement rock depths (3100 m), while the eastern and southwestern parts exhibit a deep basement structure, reaching more than 7000 m. The interpretation of advanced well-log data (the OMRI dipmeter) confirmed the resultant structural trends from the Bouguer gravity map that influence production of the Upper Safa and Lower Safa reservoirs in El-Obaiyed Field.
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Ibe Alexander Omenikolo, Terhemba Theophilus Emberga, and Alexander Iheanyichukwu Opara. "Basement depth re-valuation of anomalous magnetic bodies in the lower and middle Benue trough using Euler deconvolution and spectral inversion techniques." World Journal of Advanced Research and Reviews 14, no. 2 (2022): 129–45. http://dx.doi.org/10.30574/wjarr.2022.14.2.0356.
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Spectral technique and Euler Deconvolution were applied to high-resolution aeromagnetic data of parts of Benue trough to estimate the depth of anomalous magnetic sources within the study area; Data enhancement techniques such as total magnetic intensity map, reduction to pole, regional-residual separation and upward continuation maps were employed to identify different magnetic anomalies, structural trends representing the tectonics of the location were observed trending NE-SW and N-S directions; The result of 3D Euler deconvolution for the structural index (SI) = 0, 1, 2, 3 gave depths to magnetic sources that range from -589;3 m to -2678;8 m, -459;0 m to -2691;9 m, -294;6 m to -2817;5 m, - 430;2 m to -2780;6 m respectively; The depth estimates from 2-D spectral revealed a two-layer model; The shallow magnetic depth ranges between 0;135 km to 0;200 km with a mean depth of 0;158 km and the depth to magnetic basement vary between 2;585 km to 4;878 km with a mean depth of 3;415 km; This result, therefore, indicates that the average basement depth of the study area obtained from the spectral analysis is 3;415km; This investigation, therefore provides appropriate sedimentary thickness for suitable hydrocarbon prospecting within the study area.
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Ibe, Alexander Omenikolo, Theophilus Emberga Terhemba, and Iheanyichukwu Opara Alexander. "Basement depth re-valuation of anomalous magnetic bodies in the lower and middle Benue trough using Euler deconvolution and spectral inversion techniques." World Journal of Advanced Research and Reviews 14, no. 2 (2022): 129–45. https://doi.org/10.5281/zenodo.7186181.
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Spectral technique and Euler Deconvolution were applied to high-resolution aeromagnetic data of parts of Benue trough to estimate the depth of anomalous magnetic sources within the study area; Data enhancement techniques such as total magnetic intensity map, reduction to pole, regional-residual separation and upward continuation maps were employed to identify different magnetic anomalies, structural trends representing the tectonics of the location were observed trending NE-SW and N-S directions; The result of 3D Euler deconvolution for the structural index (SI) = 0, 1, 2, 3 gave depths to magnetic sources that range from -589;3 m to -2678;8 m, -459;0 m to -2691;9 m, -294;6 m to -2817;5 m, - 430;2 m to -2780;6 m respectively; The depth estimates from 2-D spectral revealed a two-layer model; The shallow magnetic depth ranges between 0;135 km to 0;200 km with a mean depth of 0;158 km and the depth to magnetic basement vary between 2;585 km to 4;878 km with a mean depth of 3;415 km; This result, therefore, indicates that the average basement depth of the study area obtained from the spectral analysis is 3;415km; This investigation, therefore provides appropriate sedimentary thickness for suitable hydrocarbon prospecting within the study area.
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Doğru, Fikret, and Nafiz Maden. "Hydrocarbon reservoir depth identification in the eastern black sea basin: Implications from euler deconvolution and gravity tensor invariants." Marine and Petroleum Geology 151 (May 2023): 106201. http://dx.doi.org/10.1016/j.marpetgeo.2023.106201.
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D., A. Obi, J. Ilozobhie A., E. Lebo S., and Zoogbara Evidence. "Modeling Magnetic Basement in Relationship to Hydrocarbon Habitats in the Central Niger Delta, Nigeria." Journal of Geography, Environment and Earth Science International 10, no. 4 (2017): 1–13. https://doi.org/10.9734/JGEESI/2017/31888.
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Aeromagnetics has over the years been used as a reconnaissance tool for hydrocarbon exploration. Modeling of source of magnetic anomalies can also reveal basin depth and configuration of supposed hydrocarbon habitats. This study was done using (8) aeromagnetic maps on a scale of 1:100,000 covering the central Niger Delta states in Nigeria. The data was digitized and processed using the United States Geological Survey potential field software’s version 2.2 for map merging, reduction to pole, polynomial filtering, horizontal gradient magnitude (HGM), Wenner deconvolution, forward and inverse modeling (pdep and saki programs). The result indicates areas around Benin River, Warri, Kwale and Aboh with more dominant shallow depths (0.8 km-2.01 km) with minor areas reaching deeper sources (2.5 km-4.5 km) while areas around Forcados, Burutu and Ahoada have predominantly deeper sources (2.5 km-4.5 km). Generally, there is an agreement in all the depth-derived sources of an increase in sediment thickness accumulation from the onshore (Warri areas) towards the offshore (Burutu) with horst and graben structures as indicated from the saki models. The identified grabens are the recognized possible hydrocarbon habitat, which forms potential targets for hydrocarbon exploration prior to seismic exploration.
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Olokoba, Saheed Oluwakemi, and Yusuf Magaji. "ANALYSIS OF HIGH-RESOLUTION AEROMAGNETIC DATA OVER PARTS OF SOKOTO BASIN, NORTH-WEST NIGERIA." Platform : A Journal of Engineering 4, no. 2 (2020): 14. http://dx.doi.org/10.61762/pajevol4iss2art8601.
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Sokoto Basin is one of the sedimentary basins suspected to have high hydrocarbon potential. Hence, due to the possible deposit of this economic mineral, it is worthy of being preliminarily investigated. This paper uses high-resolution aeromagnetic data over parts of Sokoto Basin covering longitude 4.00°E-5.00°E and longitude 12.00°N-13.00°N, to assess the sedimentary thickness beneath the subsurface while also establishing the basement topography. The studied area covered four adjacent one-degree sheets, namely, sheet 27 (Lema), sheet 28 (Argungu), sheet 49 (BirninKebbi) and sheet 50 (Tambuwal). Enhancement of the total magnetic intensity map was carried out to improve the anomaly characteristic of source bodies, and two-dimensional Spectral analysis was carried out using GEOSOFT software (Oasis montaj6.24 version) in order to estimate magnetic source depths in the area. The shallower sources occur at a depth range of 0.23 km - 0.79 km with an average depth of 0.47 km, while the deeper sources occur at a depth range of 0.83 km -1.95 km with an average depth of 1.40 km. The maximum depth to the top of the magnetic source body gets deeper around Lema and IllelaKwandu while the minimum depth is around Tambuwal, Danjema and Birnin-kebbi. Thedepth estimated from the spectral analysis compares reasonably well with the results from the Euler deconvolution. The areas with higher sedimentary thickness toward the northern part of the study area are feasible for hydrocarbon generation and are thus recommended for other geophysical surveys.Keywords: Sokoto Basin, sedimentary thickness, hydrocarbon exploration, high-resolution, aeromagnetic data,geophysical surveys
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Olatubosun, Esho Oluwaseyi, Osisanya Olajuwon Wasiu, Ibitoye Taiwo Abel, Ajibade Femi Zephaniah, and Tokunbo Sanmi Fagbemigun. "Aeromagnetic Interpretation of Basement Structures and Geometry in Parts of the Middle Benue Trough, North Central, Nigeria." Advances in Geological and Geotechnical Engineering Research 4, no. 4 (2022): 22. http://dx.doi.org/10.30564/agger.v4i4.5128.
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The research of an analysis of aeromagnetic data collected in the middle Benue Trough in north-central Nigeria is presented. A detailed analysis of basement structures is conducted in order to identify regions with high hydrocarbon potential that is different from those discovered by earlier researchers. Aeromagnetic data were filtered by using the Butterworth and Gaussian filters, transformed by engaging the reduction to the equator technique, and subsequently enhanced. To estimate magnetic basement depths at various places throughout the basin, the Euler deconvolution depth weighting approach was used. Eleven (11) sub-basins with depths ranging from –2000 m to –8000 m were also identified by Euler’s findings. The sub-basins trend in the NE-SW direction while the average sediment thickness is found to be more than 3 km. The extracted structural features indicate areas like Kadi Blam and Kado areas in the southeastern part and Ogoja and Obudu in the southern part of the study area as regions with high structural densities. These areas coincide with the areas delineated as the sub-basins. The cross-sections generated reveal depressions caused by the action of some tectonic activities in the area. This study identified undulating basement topography believed to be due to tectonic activities as well as five areas that are possible targets for hydrocarbon exploration.
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Abubakar, Adamu, Othniel Kamfani Likkason, Ahmed Sadiq Maigari, and Sani Ali. "Structural Mapping Inferred from Gravity Data to Image the Upper Lithospheric Structures and its Hydrocarbon Implication from Gwandu Formation NW, Nigeria." Indonesian Journal of Earth Sciences 2, no. 1 (2022): 78–95. http://dx.doi.org/10.52562/injoes.v2i1.346.
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Presently a digitized composite satellite gravity data covering the Gwandu formation in Sokoto Basin were acquired and processed with a view to interpret the Bouguer anomalies as well to equally image the upper lithospheric structures beneath the Study area and its environs. The research work was aim to study the structural settings of crustal movement in the Gwandu formation. A least-square fitting polynomial surface of a third-degree order was applied in separating regional and residual gravity components from the Bouguer anomaly. The attributed low gravity sedimentary infill from the residual anomalies were tectonically trends NE -to- SW about the vicinities of Tambuwal, Goronyo, Gada and Argungu, Kolmalo and about Yauri, Koko and Jega, Kamba as well as Bagudo. Data enhancement techniques such as first vertical derivative, total horizontal derivative (THDR), analytic signal, spectral depth analysis, and the standard Euler deconvolution (SED) were applied to enhance deep-seated structures. Results from the Spectral Analysis revealed that the average thickness of the sediments varies from 1.679 km to 4.181 km, outsized enough for hydrocarbon prospect. The derivative maps revealed parallel to sub-parallel trending NW –to- SE, E -to- W fracture zones within the sedimentary infill underlying the study area, coinciding with the cretaceous zones. Hence, the identified lineaments (faults or lithologic contacts) and structures in the area can be attributed to the tectonic setting of the area and probable migratory routes for hydrocarbon migration. More detailed ground gravity and seismic studies may lead to discoveries of structural or stratigraphic traps.
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Kamto, Paul Gautier, Willy Lemotio, Alain-Pierre Kamga Tokam, and Loudi Yap. "Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Exploration." International Journal of Geophysics 2021 (June 23, 2021): 1–14. http://dx.doi.org/10.1155/2021/5554528.
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The southwestern coastal region of Cameroon is an area of interest because of its hydrocarbon potential (gas and oil). Terrestrial and satellite gravity data were combined and analyzed to provide a better precision in determining the structure of the study area. Firstly, the two gravity databases (in situ and satellite) have been coupled and validated using the least square collocation technique. Then, spectral analysis was applied to the combined Bouguer anomaly map to evaluate the thickness of sediments in some localities. We found that the sedimentary cover of the southwestern coastal region of Cameroon has a thickness that varies laterally from 1.68 ± 0.08 to 2.95 ± 0.15 km , especially in the western part. This result confirms that our target area is a potential site for hydrocarbon exploration. The horizontal gradient method coupled with the upward continuation at variable heights has been used to highlight several lineaments and their directions (N-S, E-W, SW-NE, and SSW-NNE). Lineaments trending in an N-S orientation are predominant. The Euler deconvolution method was also applied to the Bouguer anomaly map to determine the position, orientation, and depth of the different superficial faults of the study area. It appears that the majority of superficial faults have an N-S and SSW-NNE orientation. These directions are correlated with those previously highlighted by the maxima of horizontal gradient. The structural map could be used for a better identification of the direction of fluid flow within the subsurface or to update the geological map of our study area.
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Hussaini, Adamu, and Abdullah Musa Ali. "AREAL AND DEPTH ESTIMATION OF SUBSURFACE ANOMALOUS STRUCTURES OF OYANDEGA AND ENVIRONS, PART OF THE ANAMBRA BASIN USING 2D MODELLING OF MAGNETIC DATA." Geological Behavior 8, no. 1 (2024): 90–98. https://doi.org/10.26480/gbr.02.2024.90.98.
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This study employed spectral analysis, Source Parameter Imaging (SPI), and Euler deconvulation techniques on two aeoromagnetic data sheets (Illushi 286 and Nsukka 287) to assess the depth to sub-surface structures and estimate the depth to magnetic sources at the transition region of Oyandega Area, Ibaji local government of Kogi state, part of lower Benue Trough (Anambra Basin). SPI techniques show minimum to maximum depth to anomalous source as 25.765m to 2533.293m. Euler deconvolution for contact body (Structural Index=1), indicate depth ranges from -473.70m to 751.11m, for extrusive body like thin layer, dyke (Structural Index =2) ranges from -619.74 to 1122.25m and for sphere (Structural Index =3), the depth to magnetic source obtained ranges from -800m to 1494.12m. From the spectral analysis, depth to the first layer (D1) in the study area varies from 1.3100 km to 5.6700 km with an average depth of 3.4900 km while second layer depth (D2) varies from 0.15300 km to 1.3200 km with the average depth of 0.7365 km. This result therefore indicates that the average basement depth of the study area as deduced from power spectrum inversion is 2.11325 km. The results favour the accumulation of petroleum around Agnosi, Annegbette, ijankuta and Uhro of the study area. The shallow magnetic sources around Nwajala, Adani, and Ogbo-uvuru are believed to be the resultant of basement rocks that were tectonically uplifted into the sedimentary overburden.
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GHONEIMI, Ashraf, Nashat S. GAWISH, and Muhammad NABIH. "Integrated geophysical and geochemical study for investigating the hydrocarbon potentiality of West Dakhla area, Western Desert, Egypt, as an extension of Libyan Kufra basin." Contributions to Geophysics and Geodesy 52, no. 3 (2022): 467–99. http://dx.doi.org/10.31577/congeo.2022.52.3.6.
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The present study represents an integrated study using the potential field maps and well geochemical data of the West Dakhla area in the western central area of the Western Desert area, Egypt. The potential field data are represented by the airborne gravity and total magnetic maps acquired by the Nuclear Material Authority (NMA), Egypt, on behalf of Dana Petroleum Company. The geochemical data consist of geochemical analysis in Ammonite-1 well that were done for source rock evaluation. Different processing techniques on the gravity and magnetic maps are carried out for separating the regional and residual separation and filtering. Modelling and Euler deconvolution tools are utilized for proposing the depth to basement and constructing basement-depth maps to infer the basin configuration of the study area. Before acquiring the present geophysical data, the study area wasn't subjected to any exploration investigations. Therefore, these data and this study are considered as the first efforts carried out and submitted for publication in this area. In addition, a comparison of the present basin is done with matched basins in southern Libya, where this basin is expected to have similar geological features. The study indicates that the studied basin may be a part of a wider basin extending in Egypt and Libya. This basin is expected to have the thickness and features that are favourable for hydrocarbon habitat. The geochemical analysis shows TOC values ranging from poor to very good source rock potentiality.
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Lukacova, Viera, Ming Peng, Gail Fanucci, et al. "Drug-Membrane Interactions Studied in Phospholipid Monolayers Adsorbed on Nonporous Alkylated Microspheres." Journal of Biomolecular Screening 12, no. 2 (2007): 186–202. http://dx.doi.org/10.1177/1087057106297063.
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Characterization of interactions with phospholipids is an integral part of the in vitro profiling of drug candidates because of the roles the interactions play in tissue accumulation and passive diffusion. Currently used test systems may inadequately emulate the bilayer core solvation properties (immobilized artificial membranes [IAM]), suffer from potentially slow transport of some chemicals (liposomes in free or immobilized forms), and require a tedious separation (if used for free liposomes). Here the authors introduce a well-defined system overcoming these drawbacks: nonporous octadecylsilica particles coated with a self-assembled phospholipid monolayer. The coating mimics the structure of the headgroup region, as well as the thickness and properties of the hydrocarbon core, more closely than IAM. The monolayer has a similar transition temperature pattern as the corresponding bilayer. The particles can be separated by filtration or a mild centrifugation. The partitioning equilibria of 81 tested chemicals were dissected into the headgroup and core contributions, the latter using the alkane/water partition coefficients. The deconvolution allowed a successful prediction of the bilayer/water partition coefficients with the standard deviation of 0.26 log units. The plate-friendly assay is suitable for high-throughput profiling of drug candidates without sacrificing the quality of analysis or details of the drug-phospholipid interactions.
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Chang, Shuai, Dalong Zhang, Linfeng Zhang, et al. "A Joint Graph-Based Approach for Simultaneous Underwater Localization and Mapping for AUV Navigation Fusing Bathymetric and Magnetic-Beacon-Observation Data." Journal of Marine Science and Engineering 12, no. 6 (2024): 954. http://dx.doi.org/10.3390/jmse12060954.
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Accurate positioning is the necessary basis for autonomous underwater vehicles (AUV) to perform safe navigation in underwater tasks, such as port environment monitoring, target search, and seabed exploration. The position estimates of underwater navigation systems usually suffer from an error accumulation problem, which makes the AUVs difficult use to perform long-term and accurate underwater tasks. Underwater simultaneous localization and mapping (SLAM) approaches based on multibeam-bathymetric data have attracted much attention for being able to obtain error-bounded position estimates. Two problems limit the use of multibeam bathymetric SLAM in many scenarios. The first is that the loop closures only occur in the AUV path intersection areas. The second is that the data association is prone to failure in areas with gentle topographic changes. To overcome these problems, a joint graph-based underwater SLAM approach that fuses bathymetric and magnetic-beacon measurements is proposed in this paper. In the front-end, a robust dual-stage bathymetric data-association method is used to first detect loop closures on the multibeam bathymetric data. Then, a magnetic-beacon-detection method using Euler-deconvolution and optimization algorithms is designed to localize the magnetic beacons using a magnetic measurement sequence on the path. The loop closures obtained from both bathymetric and magnetic-beacon observations are fused to build a joint-factor graph. In the back-end, a diagnosis method is introduced to identify the potential false factors in the graph, thus improving the robustness of the joint SLAM system to outliers in the measurement data. Experiments based on field bathymetric datasets are performed to test the performance of the proposed approach. Compared with classic bathymetric SLAM algorithms, the proposed algorithm can improve the data-association accuracy by 50%, and the average positioning error after optimization converges to less than 10 m.
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Попков, Вячеслав Иванович, and Александр Моисеевич Штеренберг. "Post-sedimentation structure of zhiguli dislocation and neo-tectonics of cis-urals domaniks. Geological risks of development." Нефтяная провинция, no. 4(8) (December 28, 2016): 1–22. http://dx.doi.org/10.25689/np.2016.4.1-22.
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Представлена феноменологическая модель геомеханики структурирования гетерогенно-равновесной постседиментации геофизической синергии ритмов массива горных пород Жигулевской дислокации. Представлены дополнительные исследования, сейсмологи-ческая, тектонофизическая, геологическая, геофизическая информация поиска и разведки нетрадиционных месторождений и геогидродинамического моделирования этапов разработки сложнопостроенных коллекторов динамического порового пространства. Исследовано напряженно-деформированное состояние горного массива и скважин в процессе подземной разработки для крупномасштабных объектов Жигулевской дислокации. Научно обоснован инерционно-капиллярный закон сохранения количества движения Дарси-Стокса и квадратичного уплотнения структуры нефтенасыщения тангенциальной упаковки геофизической синергии ритмов фильтрации и поровой диффузии нормального распределения Гаусса. На основании решения уравнений массопереноса и сохранения количества движения для сейсмической эмиссии различных структур энергетически сопряжены фильтрация, подчиняющаяся закону Дарси и структурно-топологическая дислокация импульсов по Эйлеру мобилистической неотектоники порово-кавернозно-трещиноватой диссипации фазового осаждения глобальной аккумуляции углеводородов. The author presents the heterogenetic balanced volumetric geo-mechanical model for the structural massif of mountain rock post-sedimentation in view of geo-physical synergy and petro-migration. The paper provides a set of additional studies for seismic, tectono-physical, geological, geo-physical information in a process of search and exploration of hydrocarbon fields and large-scaled construction of surface and subsurface equipment, well drilling and their completion, as well as geo-dynamic studies, geo-hydrogeological simulation of their development stages. The author has studied the change in stress-deformed status of mountain massifs and the wells in a process of their subsurface operation. He also has studied the stress fields for the large-scaled reef formations in Zhiguli dislocation and the Cis-Ural region. The author has scientifically proved the inertia-capillary law of movement conservation (by Darcy-Stokes) and stress-deformed status of square compaction and structural packs of geo-physical rhythms during filtration, petro-migration diffusion and mass-transfer (Bessel’s ray-path and Gaussian distribution). Basing upon the solution of equations related to number of movements (of Navier-Stokes type) for the deformed porous media and conjugated seismic emission of various mass transfer structures he, in a form of a system, has combined filtration as per Darcy and diffusion of structural-topological dislocation of impulses as per Euler with mobile neo-tectonics in porous-cavernous-fractured dissipative accumulation of spectral-phase sedimentation and accumulation of hydrocarbons
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A Nwos Prisca-Gaelle, Bien, Mounchili Ibrahim, Apouamoun Yiagnigni Roland, Etoundi Jean, Ndongue Constantin, and Meying Arsene. "THE CONTRIBUTION OF REMOTE SENSING AND AEROMAGNETISM TO GOLD PROSPECTING: THE CASE OF THE MEIGANGA ZONE, CAMEROON." International Journal of Advanced Research 9, no. 5 (2021): 775–93. http://dx.doi.org/10.21474/ijar01/12903.
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In order to optimize gold prospecting in the Meiganga zone located in the Adamaoua region of Cameroon, aeromagnetic and remote sensing prospecting was carried out in the eastern and southern parts. The remote sensing approach on a Landsat 8 OLI/TIRS image highlighted areas of maximum gold concentration. Thus, ferric ion bearing minerals are located in the North-West, silicate minerals bearing ferrous ions are in the Centre while clay minerals are in the North-East and East. The principal component analysis revealed important structural information. The PCA Spatial Map (PC1, PC2, PC3) showed the plutonic formations composed of anatexis and anatexis granites, vegetation cover (at the date of image acquisition: February 22, 2019), areas of permanent water circulation or accumulation, and metamorphic and sedimentary formations namely gneisses, quartzites, schists and superficial clay formations. A Landsat SRTM (Shuttle Radar Topography Mission) image was also used to enhance the lineaments through the Sobel filter to highlight the geomorphological (cliffs, valleys, ...) and topographic (river network, ridge and drainage segment) structures. The aeromagnetic approach was also important. The study of the modified magnetic field (CM) showed 4 ranges: very high, high, medium and low. The Total Magnetic Anomalies (TMI) of the area are subdivided into 2 ranges large positive anomalies (221.1-103.0 nT) located in the lower part of NE-SW orientation, small positive anomalies (103.0-(-)89.7 nT) located in the upper part of NE-SW orientation. The reduced total magnetic anomaly at the equator shows a fairly similar distribution to the total magnetic anomaly with the large positive anomalies in almost the entire lower part. Superimposed on the geological map, Neoproterozoic pre- to syn-tectonic granitoids (C) are superimposed on the large positive anomalies and Neoproterozoic conglomerates, quartzites, sedimentary shales and volcanosedimentary rocks (A) and Neoproterozoic syn-tectonic granitoids (B) are superimposed on the large and small positive anomalies. The grid of the reduced residual equatorial anomaly (ARRE) confirms that the local geology is strongly magnetic (gneiss and quartzite). The filters of the derivatives allowed to establish a map of magnetic lineaments of major orientation N045° and minor orientation N130°. The horizontal gadient superimposed on the local maxima showed the presence of deep structures oriented NE-SW. The analytical signal superimposed on the local maxima highlights the metamorphic basement consisting of rocks with strong magnetism. The application of Euler deconvolution localizes the depth of the sources of linear anomalies.
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Elawadi, Eslam, Ibraheim Gaafar, Gad El-Qady, Mohamed Metwaly, and Sándor Szalai. "Magnetic data interpretation: Implication for structure and hydrocarbon potentiality at Delta Wadi Diit, Southeastern Egypt." Open Geosciences 16, no. 1 (2024). http://dx.doi.org/10.1515/geo-2022-0720.
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Abstract The south-eastern part of the Egyptian desert had been waiting for a long time for an exploration process of hydrocarbon potentiality. In this research, we are addressing the available high resolution airborne magnetic data of Delta Wadi Diit area, which were processed and interpreted to map the basement depths and structures as an aid for hydrocarbon potentiality elucidation. Applying a set of automatic interpretation techniques to the magnetic data enabled mapping the tectonic framework of the study area and determining the depth to the basement (in other words, thickness of sedimentary section), which are vital factor of hydrocarbon field analysis. These techniques involve edge detection, depth estimation, as well as 2D and 3D modeling. Edge detection methods include the horizontal tilt angle (TDX) and improved logistic function of total horizontal gradient. Moreover, Euler deconvolution, tilt angle, and source parameter imaging provide both location and depth of the magnetic sources. Interpreted structures reveal that Wadi Diit area is highly affected by shallow and deep-seated faults trending in NW-SE and ENE-WSW and NNE-SSW directions. These fault systems control the surface water drainage network, the contacts of different rock types, the Red Sea rift boundary, and local and reginal basin areas. Depth estimation techniques reveal that the depth of the basement rocks ranges from 300 to 3,500 m for the inshore parts and from 2,500 to 5,000 m for the offshore parts of the area. Basement structure of the area was then refined through applying 2D modeling along two selected profiles and 3D modeling of RTP magnetic data for the entire area. The final depth map reveals major offshore basins at the northeastern side with sedimentary section of more than 3 km thickness. Moreover, local basins are delineated inshore at the southeastern parts. The eastern part of the study area can be considered to be having high hydrocarbon potentialities. Moreover, the inshore basin areas are suitable for groundwater accumulation that makes Wadi Diit delta as one of the most promising areas for sustainable development along the Red Sea’s shore.
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Layade, Gideon Oluyinka, Hazeez Edunjobi, Victor Makinde, and Babatunde Bada. "Estimation of Depth to Bouguer Anomaly Sources Using Euler Deconvolution Techniques." Materials and Geoenvironment, May 3, 2021. http://dx.doi.org/10.2478/rmzmag-2020-0016.
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Abstract The geophysical measurement of variations in gravitational field of the Earth for a particular location is carried out through a gravity survey method. These variations termed anomalies can help investigate the subsurface of interest. An investigation was carried out using the airborne satellite-based (EGM08) gravity dataset to reveal the geological information inherent in a location. Qualitative analysis of the gravity dataset by filtering techniques of two-dimensional fast Fourier transform (FFT2D) shows that the area is made up of basement and sedimentary Formations. Further enhancements on the residual anomaly after separation show the sedimentary intrusion into the study area and zones of possible rock minerals of high and low density contrasts. Quantitative interpretations of the study area by 3-D Euler deconvolution depth estimation technique described the depth and locations of gravity bodies that yielded the gravity field. The result of the depth to basement approach was found to be in the depth range of 930 m to 2,686 m (for Structural Index, SI = 0). The research location is a probable area for economic mineral deposits and hydrocarbon exploration.
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Qin, Xiangjie, Han Wang, Yuxuan Xia, Wu He, Xuanzhe Xia, and Jianchao Cai. "Three-dimensional modeling of nanoconfined multiphase flow in clay nanopores using FIB-SEM images of shale." Innovation Energy, 2024, 100050. http://dx.doi.org/10.59717/j.xinn-energy.2024.100050.
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<p>Understanding the flow characteristics within shale nanopores is crucial for enhancing hydrocarbon recovery. However, the flow characteristics of wetting and non-wetting fluids on nanopore surfaces differ significantly, limiting the accurate prediction of hydrocarbon accumulation and migration. This work introduces the Euler-Euler volume of fluid method to establish a multiphase flow numerical model in shale nanopores, considering complex pore topology, slip flow, and capillary effects. Based on natural three-dimensional shale nanoporous systems constructed from FIB-SEM images, single-phase water/oil flow and water-oil forced imbibition simulations are carried out under the complete wetting condition. Results show that the displacement pressure is reduced and the imbibition rate is elevated considering nanoscale slip effects. As imbibition progresses, the pressure and imbibition rate gradually converge toward the values observed in conventional flows. In complete wetting nanoporous systems, water flow experiences high pressure and low velocity, whereas the pressure for oil flow is significantly reduced. Forced imbibition may undergo a transition from capillary force-dominated to viscous force-dominated, with a negative displacement pressure at the initial stage. Furthermore, the fluctuations in water-oil mass flow considering the slip effect are less pronounced than those observed in conventional flows, leading to reduced residual fluid saturation in blind-end pores and pore bodies caused by snap-off events. Pore systems with poor connectivity and narrow throat structures correspond to low displacement efficiency. The findings of this work explain the impact of nanoscale slip effects on flow characteristics in unconventional reservoirs, contributing to the reasonable assessment of fluid flow capacity and facilitating production planning.</p>