Relevant bibliographies by topics / Dissolution des carbonates

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Academic literature on the topic 'Dissolution des carbonates'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Dissolution des carbonates"

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Edmonds, Clive N. "Chapter 15 Dissolution – carbonates." Geological Society, London, Engineering Geology Special Publications 29, no. 1 (2020): 389–401. http://dx.doi.org/10.1144/egsp29.15.

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AbstractThe dissolution of limestone and chalk (soluble carbonates) through geological time can lead to the creation of naturally formed cavities in the rock. The cavities can be air, water, rock or soil infilled and can occur at shallow levels within the carbonate rock surface or at deeper levels below. Depending upon the geological sequence, as the cavities break down and become unstable they can cause overlying rock strata to settle and tilt and also collapse of non-cemented strata and superficial deposits as voids migrate upwards to the surface. Natural cavities can be present in a stable or potentially unstable condition. The latter may be disturbed and triggered to cause ground instability by the action of percolating water, loading or vibration. The outcrops of various limestones and chalk occur widely across the UK, posing a significant subsidence hazard to existing and new land development and people. In addition to subsidence they can also create a variety of other problems such as slope instability, generate pathways for pollutants and soil gas to travel along and impact all manner of engineering works. Knowledge of natural cavities is essential for planning, development control and the construction of safe development.
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Stockmann, G., D. Wolff-Boenisch, S. R. Gíslason, and E. H. Oelkers. "Dissolution of diopside and basaltic glass: the effect of carbonate coating." Mineralogical Magazine 72, no. 1 (February 2008): 135–39. http://dx.doi.org/10.1180/minmag.2008.072.1.135.

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AbstractFar-from-equilibrium dissolution experiments with diopside and basaltic glass in mixed-flow reactors at 70°C and pH 8.2 show that solute concentrations do not reach steady state over the experimental duration of 45—60 days. Chemical modelling indicates that during the dissolution experiments, solutions have become supersaturated with respect to carbonates in the case of diopside, and carbonates, clay minerals and zeolites in the case of the basaltic glass. Decreasing dissolution is therefore interpreted as a result of secondary surface precipitates blocking the reactive surface area. Calcite formation was supported in both experiments by a significant increase in Ca (and Sr) concentrations as pH was abruptly lowered from 8.2 to 7 because this change increased carbonate solubility and caused all potential carbonate precipitates to re-dissolve. The reduction in pH also led to an increase in Si concentration for diopside and a decrease in Si concentration for basaltic glass. This observation is in accordance with previous experiments on the pH-dependent dissolution rates of pyroxenes and basaltic glass.
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Harbar, Vladyslav, and Andriy Lisovskiy. "Carbonations and carbonate profile forming processes of rendzinas of the Podilski Tovtry." Visnyk of the Lviv University. Series Geography, no. 51 (December 27, 2017): 88–97. http://dx.doi.org/10.30970/vgg.2017.51.8741.

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The peculiarities of content and profile distribution of carbonates in rendzinas and soil-forming rocks of the Podilski Tovtry are investigated. It has been determined that the predominant process of weathering of carbonate rocks is a chemical dissolution, in which carbonates are converted into bicarbonates and, in the case of washing water regime, are applied from the soil (the process of decarbonization) and mechanical grinding and destruction of the remaining carbonate inclusions in the process of soil cultivation. The dissolution of carbonate rocks causes accumulation in the soil profile of an insoluble residue, the intensity of which depends on the composition of carbonate rocks, the rate of filtration of aqueous solutions, their aggressiveness and the concentration of destructive substances. The most intensive such accumulation occurs in acidic medium, at a low rate of infiltration of solutions and at high concentrations of CO2. It was established that the highest proportion of CaCO3 is characterized by lithotamium limestone (up to 90–93 %), and the lowest – carbonate polygenetic loams (up to 35–40 %). The feature of the profile distribution of the content of carbonates in rendzinas is its gradual growth in the upper part of the soil profile and rapid in the middle and lower parts. It is determined that the rendzinas of the Podilski Tovtry carbonates are represented predominantly in the form of wreckage of initial soil-forming rocks of different sizes and shapes, as well as amorphous solid-phase crude and finely dispersed products of weathering in the form of powdery and powdery carbonate dusting. It is established that in dense crystallized lithotamium limestones of the main strand, the carbonate mass weakly passes moisture, and the main process of weathering occurs due to surface corrosion. The accumulation of secondary carbonates in the form of mycelium and veins is characteristic on the slopes of the Tovtry (mostly in brown rendzinas and pararendzinas), due to the vertical and lateral migration flows of the dissolved forms of CaCO3. Key words: rendzinas, Podilski Tovtry, carbonates, carbonate profile.
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Kashurin, R., S. Gerasev, and A. Suslov. "Study of the Solubility of Sediments of Certain Lantanoids in Carbonate Solutions." Bulletin of the South Ural State University series "Chemistry" 12, no. 4 (2020): 63–71. http://dx.doi.org/10.14529/chem200403.

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The study examines the dissolution process for the precipitates of the rare-earth carbonates and phosphates with a change in the concentration parameters of the system. The objective of the study is to determine the nature of the dissolution process at variable composition of the studied solutions. As a result of the theoretical base analysis, the qualitative and quantitative content of rare-earth metals in red sludge and phosphogypsum is presented, which governs the interest in this problem under consideration. The available techniques for extraction of rare-earth metals from red sludge and phosphogypsum have also been considered, their advantages and disadvantages are presented. A promising carbonate-alkali method for the extraction of rare-earth metals has been considered. Thermodynamic parameters of the system have been calculated to determine the possibility of the process. During the experiment the factors affecting the dissolution process have been examined: the carbonate ion concentration, the nature of the solvent cation and rare-earth metal cation. Carbonates and phosphates of europium, holmium, and neodymium have been considered as the analyzed components. Carbonates and phosphates of neodymium, europium, and holmium have been dissolved in model solutions of K2CO3 with the concentrations of 0.2–4.5 mol/L until reaching equilibrium. The obtained results show the dependence of solubility of the precipitates of rare-earth metals on the solvent nature and concentration. The explored data are presented as solubility isotherms. On the basis of experimental data the values of the extraction degree of a rare-earth metal into the solution have been calculated. For neodymium, europium, and holmium carbonates, the maximum recovery degree αmax is 72.8 %, 81.2 %, 83.0 %, respectively. During the experiment with dissolution of lanthanide phosphates, the following results have been obtained: the maximal degree of neodymium extraction is 60.59%, while for europium it equals 51.66 % and 93.01 % for holmium
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Kamgaing, Théophile. "Précipitation de carbonates de cations divalents dans les systèmes lacustres : intérêt, état des connaissances des mécanismes et suggestions (Revue critique de la littérature)." Revue des sciences de l’eau 28, no. 2 (July 7, 2015): 81–102. http://dx.doi.org/10.7202/1032292ar.

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Les carbonates de fer, de manganèse, de calcium et de magnésium précipités en solution des lacs sont documentés. Indicateurs de climat et de variation des caractéristiques chimiques des lacs, ils sont de plus en plus recherchés dans les sédiments. Souvent incomplets, les mécanismes de leur précipitation dans la colonne d’eau du lac et dans les eaux interstitielles sont reprécisés dans cette étude. D’après la littérature, la sidérite et la rhodochrosite précipitent en milieu réducteur saturé de carbonate de fer et de carbonate de manganèse respectivement. Ces prévisions sont confirmées dans cette étude, le potentiel redox étant un paramètre déterminant pour la précipitation du carbonate de fer. Toutefois, la littérature ne décrit pas suffisamment l’origine (géochimique ou biologique) des éléments constitutifs des solides carbonatés lacustres, encore moins les phénomènes qui stabilisent ces derniers ou les rendent vulnérables (dissolution). Cette étude apporte plus de précisions à l’endogènèse de ces carbonates, l’origine de leurs éléments constitutifs étant prise en compte. Elle montre que le caractère de l’eau (agressif ou incrustant) pourrait avoir un impact considérable sur le devenir de ces carbonates. Ainsi un dégazage forcé d’un lac rendrait ses eaux incrustantes, caractère idéal pour la précipitation des carbonates, mais néfaste à la stabilité des strates qui changent de composition après précipitation d’espèces chimiques. Par conséquent, tout projet de dégazage de lac devrait prendre en considération ce paramètre (caractère de l’eau) dans sa conception, sa mise en oeuvre et son exploitation.
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Toffolo, Michael B. "Radiocarbon Dating of Anthropogenic Carbonates: What Is the Benchmark for Sample Selection?" Heritage 3, no. 4 (November 24, 2020): 1416–32. http://dx.doi.org/10.3390/heritage3040079.

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Anthropogenic carbonates are pyrotechnological products composed of calcium carbonate, and include wood ash, lime plaster/mortar, and hydraulic mortar. These synthetic materials are among the first produced by humans, and greatly influenced their biological and cultural evolution. Therefore, they are an important component of the archeological record that can provide invaluable information about past lifeways. One major aspect that has been long investigated is the possibility of obtaining accurate radiocarbon dates from the pyrogenic calcium carbonate that makes up most of these materials. This is based on the fact that anthropogenic carbonates incorporate atmospheric carbon dioxide upon the carbonation of hydrated lime, and thus bear the radiocarbon signature of the atmosphere at a given point in time. Since plaster, mortar, and ash are highly heterogeneous materials comprising several carbon contaminants, and considering that calcium carbonate is prone to dissolution and recrystallization, accurate dating depends on the effectiveness of protocols aimed at removing contaminants and on the ability to correctly identify a mineral fraction that survived unaltered through time. This article reviews the formation and dissolution processes of pyrogenic calcium carbonate, and mineralogical approaches to the definition of a ‘dateable fraction’ based on its structural properties.
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Song, Jinmin, Shugen Liu, Hairuo Qing, Luba Jansa, Zhiwu Li, Ping Luo, Di Yang, Wei Sun, Hanlin Peng, and Tong Lin. "The depositional evolution, reservoir characteristics, and controlling factors of microbial carbonates of Dengying Formation in upper Neoprotozoic, Sichuan Basin, Southwest China." Energy Exploration & Exploitation 36, no. 4 (December 9, 2017): 591–619. http://dx.doi.org/10.1177/0144598717743995.

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The Dengying Formation of Neoprotozoic age deposited in north Sichuan Basin, China, is dominated by dolomitic strata containing microbial carbonates. Thirteen cyanobacteria forms, one oncolite and two stromatolitic structures have been identified. Different microfacies may be related to different microbe forms or assemblages as well as depositional environments. Potential hydrocarbon reservoirs in microbial carbonates are of low porosity and permeability. Microbialites develop in the members Z2 dn1, Z2 dn2, and Z2 dn4. The member Z2 dn1 and Z2 dn2 lying in the lower part, dominated by thrombolitic and spongiostromata dolostone, with three reservoir intervals of overall 190 m thick. Laminite and stromatolitic dolostone are the most important in member Z2 dn4, with three reservoir intervals of 119 m thick. Microbial carbonate reservoirs in members Z2 dn1 and Z2 dn2 were effected by two stages of fresh water dissolution, three stages of burial dissolution, and one stage of hydrocarbon invasion. But one stage of fresh water dissolution, two stages of burial dissolution, and three stages of hydrocarbon invasion modified the reservoirs of member Z2 dn4. The dominant factors for microbial reservoirs were microbial textures and development of Mianyang-Changning intracratonic sag.
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Lindroos, Alf, Jan Heinemeier, Åsa Ringbom, Mats Braskén, and Ámy Sveinbjörnsdóttir. "Mortar Dating Using AMS 14C and Sequential Dissolution: Examples from Medieval, Non-Hydraulic Lime Mortars from the Åland Islands, SW Finland." Radiocarbon 49, no. 1 (2007): 47–67. http://dx.doi.org/10.1017/s0033822200041898.

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Non-hydraulic mortars contain datable binder carbonate with a direct relation to the time when it was used in a building, but they also contain contaminants that disturb radiocarbon dating attempts. The most relevant contaminants either have a geological provenance and age or they can be related to delayed carbonate formation or devitrification and recrystallization of the mortar. We studied the mortars using cathodoluminescence (CL), mass spectrometry (MS), and accelerator mass spectrometry (AMS) in order to identify, characterize, and date different generations of carbonates. The parameters—dissolution rate, 13C/12C and 18O/16O ratios, and 14C age—were measured or calculated from experiments where the mortars were dissolved in phosphoric acid and each successive CO2 increment was collected, analyzed, and dated. Consequently, mortar dating comprises a CL characterization of the sample and a CO2 evolution pressure curve, a 14C age, and stable isotope profiles from at least 5 successive dissolution increments representing nearly total dissolution. The data is used for modeling the interfering effects of the different carbonates on the binder carbonate age. The models help us to interpret the 14C age profiles and identify CO2 increments that are as uncontaminated as possible. The dating method was implemented on medieval and younger mortars from churches in the Åland Archipelago between Finland and Sweden. The results are used to develop the method for a more general and international use.
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Hadžišehović, Munevera, Nada Miljević, Vojislava Šipka, Dušan Golobočanin, and Radule Popović. "Isotopic Analysis of Groundwater and Carbonate System in the Surdulica Geothermal Aquifer." Radiocarbon 35, no. 2 (1993): 277–86. http://dx.doi.org/10.1017/s003382220006495x.

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We present here results of our investigation of the isotopic chemical composition of groundwater and carbonates in the Surdulica geothermal aquifer, Serbia. We considered the effects of carbonate dissolution and measured 13C, 14C, D, 18O, 3H, field pH, temperature, Na+, Ca2+, Mg2+, HCO−3; and other aqueous species from 30 springs and boreholes. Geothermal waters are supersaturated with calcite. Carbon isotope compositions vary with carbonate mineral dissolution. The δD and δ18O of groundwater samples fit the meteoric water line, and indicate that groundwater is recharged mainly from higher altitudes and the cold season. Different groundwater residence times point out two mechanisms for their formation: fissure flow for young waters and standard diffusion processes for old ones.
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Kasioptas, A., C. Perdikouri, C. V. Putnis, and A. Putnis. "Pseudomorphic replacement of single calcium carbonate crystals by polycrystalline apatite." Mineralogical Magazine 72, no. 1 (February 2008): 77–80. http://dx.doi.org/10.1180/minmag.2008.072.1.77.

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AbstractDuring chemical weathering and natural hydrothermal reactions, apatite can form by replacing calcium carbonates. In hydrothermal experiments in which aragonite and calcite single crystals have been reacted with phosphate solutions, the carbonates are replaced by polycrystalline hydroxylapatite (HAP). In both cases the crystals have retained their overall morphology while their compositions have changed significantly. The HAP appears to have a crystallographic relationship to the parent carbonate crystals. The textural relationships are consistent with an interface-coupled dissolution-precipitation mechanism. Structural relationships and relative molar volumes and solubilities appear to be factors that greatly affect replacement reactions.
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Dissertations / Theses on the topic "Dissolution des carbonates"

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Hänchen, Markus. "CO storage by aqueous mineral carbonation : olivine dissolution and precipitation of Mg-carbonates." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17459.

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BERGAMASCHI, VANDERLEI S. "Influencia de parametros de precipitacao nas caracteristicas fisicas e quimicas do carbonato de zirconio." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10884.

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Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Mléneck, Vautravers Maryline. "Sédimentation et dissolution des carbonates biogéniques aux moyennes latitudes Nord et Sud : approche quantitative et relations avec les paléocirculations océaniques des derniers 150.000 ans." Bordeaux 1, 1997. http://www.theses.fr/1997BOR10514.

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La connaissance des variations de la dissolution des carbonates est primordiale pour une meilleure interpretation des signaux paleoenvironnementaux. Il a ete demontre que la fragmentation des tests de foraminiferes planctoniques est un bon indice qualitatif de la dissolution. Nous avons donc calibre experimentalement cet indice pour les moyennes latitudes des oceans atlantique nord et indien austral. Nos resultats montrent que trois especes abondantes et representatives de ces domaines (n. Pachyderma(s), g. Bulloides et g. Inflata) ont des cinetiques de dissolution distinctes. Dans l'ocean atlantique, nous montrons en appliquant cette calibration que les pertes de masse calculees a 50n atteignent 40% lors des glaciaires en raison de la presence d'une masse d'eau vraisemblablement originaire de l'ocean austral. Le bassin ouest semble avoir ete le siege d'une dissolution plus importante que le bassin est. De plus, le suivi de la composition d'un assemblage diversifie lors de sa dissolution a permis de mesurer l'impact de ce phenomene sur la reconstruction des paleotemperatures a partir de fonctions de transfert (methode des analogues modernes). Selon la composition initiale, les temperatures reconstituees presentent des divergences positives ou negatives. Nous mettons en evidence une surestimation de 6c des paleotemperatures a 72 ka. L'etude a haute resolution que nous avons mene sur la carotte su 90 44 montre qu'un meme heinrich event presente deux phases de debacle, les carbonates detritiques attestant d'une source laurentidienne plus importante dans la premiere phase. Dans l'ocean indien austral, la dissolution est importante des 2600 m dans le domaine antarctique et peut atteindre 50% dans le domaine subantarctique pendant les glaciaires. Les variations du #1#3c benthique montrent que les periodes de dissolution sont liees a l'isolement de cet ocean. Par contre, le signal de preservation est en avance sur le signal de circulation lors des transitions
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Desboeufs, Karine. "Processus de dissolution des aérosols atmosphériques au sein des gouttes d'eau nuageuses." Phd thesis, Université Paris-Diderot - Paris VII, 2001. http://tel.archives-ouvertes.fr/tel-00005175.

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Les nuages sont des éléments essentiels de notre atmosphère qui agissent à la fois sur le bilan radiatif terrestre et sur sa capacité oxydante en transformant chimiquement une grande variété d'espèces solubles. Ces nuages se forment par la condensation de vapeur d'eau sur des particules d'aérosols, appelés noyaux de condensation. La fraction soluble de ces particules conditionne l'hygroscopie des particules et détermine ainsi la taille des gouttes du nuage. Ce paramètre est déterminant pour définir les propriétés optiques des nuages. De plus, la dissolution des particules est la source primaire en phase aqueuse de différentes espèces dont les métaux de transition. Ces éléments sont impliqués dans divers processus d'oxydoréduction et en particuliers dans les processus responsables de la formation des pluies acides. Il est par conséquent très important de connaître, de manière fiable, les processus aboutissant à la solubilisation de l'aérosol dans les gouttes d'eau nuageuses. Le principal objectif de ce travail a donc été de développer un outil expérimental puis une approche de modélisation afin de comprendre et de simuler la dissolution des particules piégées dans une phase nuageuse liquide. Dans un premier temps, ce travail a consisté à mettre en oeuvre un dispositif expérimental, comportant un réacteur de dissolution en circuit ouvert, qui permet de suivre la cinétique de dissolution dans des conditions proches des conditions nuageuses. Cet outil expérimental a ensuite été utilisé pour une caractérisation systématique des différents facteurs d'influence recensés jusqu'alors sur la dissolution, c'est à dire le pH, la nature des aérosols, leur degré d'altération... mais également sur des facteurs jusqu'alors non expérimentés que sont la force ionique, la nature des acides et les cycles d'évapocondensation nuageuse. Les expériences de dissolution menées sous ces différentes conditions nuageuses ont permis de mettre en avant et de quantifier l'effet important des ions H+ et OH- sur la dissolution, ainsi que du degré de solubilisation de la particule. Ces observations ont ensuite été utilisées pour l'élaboration d'un mécanisme de dissolution des particules en phase aqueuse. Une quantification de ce mécanisme a enfin été réalisée en paramétrisant les principaux facteurs impliqués dans la dissolution. La comparaison des résultats calculés et expérimentaux montre une assez bonne adéquation, validant la paramétrisation effectuée. Finalement ce travail permet d'apporter des informations qualitatives et surtout quantitatives des interactions entre l'eau et les particules d'aérosols qui étaient encore manquantes et montrent notamment l'importance du processus de dissolution pour comprendre le rôle des aérosols dans l'implication climatique et chimique des nuages.
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Gaulard, Coralie. "Influence de l'environnement sur l'altération de la matrice UO2 du combustible irradié en situation de stockage." Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2011EVRY0019/document.

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Dans le cadre de la loi programme relative à la gestion durable des matières et déchets radioactifs du 28 Juin 2006, la France a choisi comme solution de référence le retraitement de ses combustibles usés et le stockage en milieu géologique profond des déchets ultimes vitrifiés. Néanmoins, les études relatives à un stockage direct des combustibles usés se poursuivent par mesure de précaution. Le concept de stockage prévoit de conditionner les assemblages de combustibles usés dans un surconteneur en acier dont l'étanchéité est garantie sur une durée spécifiée de l'ordre de 10 000 ans. L'arrivée d'eau au contact du combustible après dégradation du conteneur initie les processus de dégradation de la matrice UO2 conduisant au relâchement des radionucléides. Il est de ce fait, important de connaître et de comprendre le mécanisme d’altération de la matrice UO2. Pour cela, des techniques électrochimiques (voltammétries cyclique et linéaire) couplées à des techniques de caractérisation du solide et de la solution (XPS, ICP-MS) ont été utilisées.Une étude thermodynamique et bibliographique du système U(VI)/UO2(s) a permis de mettre en évidence l’influence des conditions physico-chimiques de la solution sur le système, et de mettre en évidence les différents mécanismes proposés pour décrire l’oxydation/dissolution d’UO2 dans différents milieux (non-complexant, carbonaté et argileux). L’étude de l’oxydation/dissolution d’UO2 en milieu acide non-complexant (NaCF3SO3 0,1 mol/L à pH = 3), milieu où le couple UO22+/UO2 prédomine et où la formation de précipités est limitée voire évitée, a mis en évidence un mécanisme en deux étapes électrochimiques et un modèle caractéristique de l’oxydation d’UO2 en milieu acide non-complexant. Ensuite, l’étude en milieu neutre non-complexant (NaCl 0,05 mol/L à pH = 7,5) a mis en évidence un mécanisme en deux étapes électrochimiques et une étape chimique (EEC) dans lequel les deux étapes électrochimiques sont similaires à celles proposées en milieu acide. Enfin, une première approche de l’oxydation/dissolution d’UO2 a été réalisée en milieu carbonaté (NaCl 0,05 mol/L + NaHCO3 2.10-3 mol/L à pH = 7,5) puis en présence d’une phase argileuse (MX80) dans la solution d’étude. Ces études ont respectivement montré l’influence des carbonates et de la MX80 sur la dissolution du dioxyde d’uranium
Within the framework of the geological disposal of spent nuclear fuel, research on the long term behavior of spent fuel is undertaken and in particular the study of mechanisms of UO2 oxidation and dissolution in water-saturated host rock. Under the law program on the sustainable management of radioactive materials and waste of June 28, 2006, France was chose as the reference solution the retreatment of spent fuel and disposal in deep geological repository of vitrified final waste. Nevertheless, studies on a direct disposal of spent fuel will continue for safety. The disposal concept provides for conditioning spent fuel in a steel container whose seal is guaranteed for a period specified in the order of 10,000 years. It is also reasonable to assume that the groundwater comes into contact with the fuel after the deterioration of container and lead to the UO2 matrix degradation and the release of radionuclides. The oxidation/dissolution of UO2 has been studied by means electrochemical methods coupled to XPS and ICP-MS measurements.A thermodynamic and bibliographic study of U(VI)/UO2(s) system allowed to show the effect of the physical and chemical conditions of the solution on the system, and to show the different mechanisms proposed to describe the oxidation and the dissolution of the uranium dioxide in different media (non-complexing, carbonate and clay). The study of the oxidation/dissolution of UO2 in acidic and non-complexing media (0.1 mol/L NaCF3SO3, pH = 3), where UO22+/UO2(s) predominates and the formation of precipitates is limited or even avoided, showed a mechanism with two electrochemical steps and a model characteristic of UO2 oxidation in acidic non-complexing media. Then, the study in neutral non-complexing media (0.05 mol/L NaCl, pH = 7.5) showed a mechanism with two electrochemical steps and one chemical step (EEC) in which both electrochemical steps are similar to those proposed in acidic media. Finally, a first approach of the UO2 oxidation/dissolution was carried out in carbonate media (0.05 mol/L NaCl + 2x10-3 mol/L NaHCO3, pH = 7.5) and in the presence of clay (MX80) in the solution. These studies have respectively shown the influence of carbonates and MX80 on the dissolution of uranium dioxide
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Mazingue-Desailly, Vincent Philippe Guillaume. "Assessing the influence of diagenesis on reservoir quality: Happy Spraberry Field, Garza County, Texas." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/27.

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In the Permian Basin, strata of Leonardian age typically consist of interbedded carbonates and siliciclastics interpreted to be turbidite deposits. Happy Spraberry Field produces from a 100-foot thick carbonate section in the Lower Clear Fork Formation (Lower Leonardian) on the Eastern Shelf of the Midland Basin. Reservoir facies include oolitic- to-skeletal grainstones and packstones, rudstones and in situ Tubiphytes bindstones. Depositional environments vary from open marine reefs to shallow marine oolitic shoal mounds. Best reservoir rocks are found in the oolitic-skeletal packstones. Diagenesis occurred in several phases and includes (1) micritization, (2) stabilization of skeletal fragments, (3) recrystallization of lime mud, (4) intense and selective dissolution, (5) precipitation of four different stages of calcite cement, (6) mechanical compaction, (7) late formation of anhydrite and (8) saddle dolomite and (9) replacement by chalcedony. Oomoldic porosity is the dominant pore type in oolitic grainstones and packstones. Incomplete dissolution of some ooids left ring-shaped structures that indicate ooids were originally bi-mineralic. Bacterial sulfate reduction is suggested by the presence of (1) dissolved anhydrite, (2) saddle dolomite, (3) late-stage coarse-calcite cement and (4) small clusters of pyrite. Diagenetic overprinting on depositional porosity is clearly evident in all reservoir facies and is especially important in the less-cemented parts of the oolitic grainstones where partially-dissolved ooids were subjected to mechanical compaction resulting in "eggshell" remnants. Pore filling by late anhydrite is most extensive in zones where dissolution and compaction were intense. Finally, a porosity-permeability model was constructed to present variations in oolitic packstone- rudstone-bindstone reservoir rocks. The poroperm model could not be applied to oolitic grainstone intervals because no consistent trends in the spatial distribution of porosity and permeability were identified. Routine core analysis did not produce any reliable value of water saturation (Sw). An attempt to take advantage of wireline log data indicates that the saturation exponent (n) may be variable in this reservoir.
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Miroud, Lakhdar. "Étude par traction lente de la corrosion sous contrainte des aciers au carbone en milieu alcalin : rôle des inhibiteurs passivants." Compiègne, 1991. http://www.theses.fr/1991COMPD371.

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Les aciers de construction sont sensibles à la corrosion sous contrainte (CSC) dans des milieux basiques tels que les carbonates. Des études par traction lente ont permis d'observer le comportement de deux nuances (A42 / E26 / et XC38) dans de telles conditions à pH 9. Le domaine des potentiels de susceptibilité à la CSC a été déterminé, et une fissuration inter et transgranulaire a été mise en évidence et mesurée par des méthodes micrographiques. La vitesse de fissuration a été étudiée en fonction des vitesses de déformation imposées : une vitesse expérimentale a été ainsi comparée à des valeurs calculées à partir de méthodes précédemment proposées, et de méthodes élaborées au cours de ce travail. Ces dernières donnent une meilleure idée de la fissuration observées dans notre cas. L'emploi d'un inhibiteur passivant (ions chromate) a permis de diminuer le risque de l'attaque fissurante, et d'annuler la vitesse de fissuration même dans les conditions préalablement sensibles.
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Daly, P. J. "Dissolution kinetics of calcium carbonate." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372693.

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Pereira, Nunes Joao Paulo. "Pore-scale modelling of carbonate dissolution." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/34683.

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High resolution micro-CT images of porous rocks provide a very useful starting point to the development of pore-scale models of fluid flow and transport. Following a literature review covering recent results on the applicability of tomographic imaging to study reaction phenomena at the pore and core scales, this thesis presents a pore-scale streamline-based reactive transport model to simulate rock dissolution. The focus is on carbonate dissolution in CO2-saturated fluids. After injecting CO2-rich fluids into carbonate reservoirs, chemical reactions between the acidic fluid and the host rock are to be expected. Such reactions may cause significant variations in the flow and transport properties of the reservoir, with possible consequences for field development and monitoring. The interplay between flow and reaction exhibits a very rich behaviour that has not yet been fully understood, especially in the case of carbonate rocks, which possess a complex pore structure. The model is developed within a Lagrangian framework, where the advective displacement employs a novel streamline tracing method which respects the no-flow boundary condition at the pore walls. The method is implemented in the pore-space geometry reconstructed from micro-CT images of sedimentary rocks. Diffusion is incorporated with a random walk and fluid-solid reactions are defined in terms of the diffusive flux of reactants through the grain surfaces. To validate the model, simulation results are compared against a dynamic imaging experiment where a carbonate sample was flooded with CO2-saturated brine at reservoir conditions. The agreement is very good and a decrease of one order of magnitude in the average dissolution rate, compared to the rate measured in an ideal reactor, is explained in terms of transport limitations arising from the flow field heterogeneity. The impact of the flow heterogeneity in the reactive transport is illustrated in a series of simulations performed in rocks with different degrees of complexity. It is shown that more heterogeneous rocks, in the sense of flow heterogeneity, may exhibit a decrease of up to two orders of magnitude in the sample-averaged reaction rates, and that the flow rate is also an important factor when studying carbonate dissolution.
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Golfier, Fabrice. "Dissolution des roches carbonatées par injection d'acide." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2001. http://tel.archives-ouvertes.fr/tel-00634112.

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Les traitements d'acidification sont généralement utilisés pour stimuler l'injection et/ou la productivité des puits dans les formations de carbonates. Cependant, de nombreux traitements ne produisent pas les résultats attendus en terme de gain de productivité à cause de la mauvaise modélisation autour du puits des mécanismes physiques intervenant durant le processus d'injection acide. La nature instable du phénomène de dissolution en milieu poreux entraîne la formation de canaux fortement conductifs appelés wormholes, qui sont difficiles à modéliser quantitativement. Un modèle de dissolution à l'échelle de Darcy est proposé comprenant une équation de Darcy-Brinkman pour la partie écoulement couplée avec un modèle de dissolution en non-équilibre local. Un simulateur numérique 3D a été développé pour résoudre ce système d'équations en utilisant une méthode de pas fractionnaire et des schémas TVD. Les résultats sont présentés sur des configurations 2D et 3D aussi bien pour des systèmes homogènes qu'hétérogènes. Les résultats numériques sont discutés d'un point de vue qualitatif et quantitatif par rapport à la littérature et comparés aux résultats expérimentaux. Les expériences ont été réalisées sur un massif de sel quasi 2D dans lequel on a injecté une solution d'eau salée sous-saturée. Les instabilités de dissolution, le développement des canaux et la propagation des wormholes ont été enregistrés à l'aide d'une caméra vidéo. En se basant sur les résultats 2D, la possibilité d'une description du phénomène à l'échelle de la section, c'est-à-dire en effectuant des moyennes sur des sections du domaine, a été explorée. Plusieurs approches sont utilisées, tels que les modèles à une équation, où le milieu considéré incorpore la physique du wormhole et la matrice poreuse environnante, et les modèles à deux équations pour lesquels les wormholes sont traités séparément. Les implications théoriques sont discutées en se basant sur les résultats numériques.
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Books on the topic "Dissolution des carbonates"

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Schuster, Paul F. Effects of acid deposition on dissolution of carbonate stone during summer storms in the Adirondack Mountains, New York, 1987-89. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Calcium carbonate dissolution rate in limestone contactors: Project summary. Cincinnati, OH: U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory, 1995.

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Kirchman, David L. Introduction to geomicrobiology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789406.003.0013.

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Geomicrobiology, the marriage of geology and microbiology, is about the impact of microbes on Earth materials in terrestrial systems and sediments. Many geomicrobiological processes occur over long timescales. Even the slow growth and low activity of microbes, however, have big effects when added up over millennia. After reviewing the basics of bacteria–surface interactions, the chapter moves on to discussing biomineralization, which is the microbially mediated formation of solid minerals from soluble ions. The role of microbes can vary from merely providing passive surfaces for mineral formation, to active control of the entire precipitation process. The formation of carbonate-containing minerals by coccolithophorids and other marine organisms is especially important because of the role of these minerals in the carbon cycle. Iron minerals can be formed by chemolithoautotrophic bacteria, which gain a small amount of energy from iron oxidation. Similarly, manganese-rich minerals are formed during manganese oxidation, although how this reaction benefits microbes is unclear. These minerals and others give geologists and geomicrobiologists clues about early life on Earth. In addition to forming minerals, microbes help to dissolve them, a process called weathering. Microbes contribute to weathering and mineral dissolution through several mechanisms: production of protons (acidity) or hydroxides that dissolve minerals; production of ligands that chelate metals in minerals thereby breaking up the solid phase; and direct reduction of mineral-bound metals to more soluble forms. The chapter ends with some comments about the role of microbes in degrading oil and other fossil fuels.
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Book chapters on the topic "Dissolution des carbonates"

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Tseitlin, Michael, Valentina Raiko, and Aleksei Shestopalov. "Kinetics of Sodium Chloride Dissolution in Condensates Containing Ammonia and Ammonium Carbonates." In Lecture Notes in Mechanical Engineering, 882–92. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22365-6_88.

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Anderson, Leif G. "Carbonate Dissolution." In Encyclopedia of Marine Geosciences, 78–80. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6238-1_46.

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Anderson, Leif G. "Carbonate Dissolution." In Encyclopedia of Marine Geosciences, 1–4. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6644-0_46-1.

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Anderson, Leif G. "Carbonate Dissolution." In Encyclopedia of Marine Geosciences, 1–3. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6644-0_46-2.

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Canfield, Donald E., and Robert Raiswell. "Carbonate Precipitation and Dissolution." In Topics in Geobiology, 411–53. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-5034-5_9.

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Lucia, F. Jerry. "Diagenetic Overprinting and Rock Fabric Distribution: The Cementation, Compaction, and Selective Dissolution Environment." In Carbonate Reservoir Characterization, 109–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03985-4_5.

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Lucia, F. Jerry. "Diagenetic Overprinting and Rock-Fabric Distribution: The Massive Dissolution, Collapse, and Fracturing Environment." In Carbonate Reservoir Characterization, 157–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-03985-4_7.

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Ford, Derek. "Characteristics of Dissolutional Cave Systems in Carbonate Rocks." In Paleokarst, 25–57. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3748-8_2.

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Fox, J. L., Z. Wang, J. Hsu, A. Baig, S. Colby, G. L. Powell, M. Otsuka, and W. I. Higuchi. "Metastable Equilibrium Solubility Distribution and Dissolution Kinetics of Carbonate Apatite Powders." In Mineral Scale Formation and Inhibition, 231–50. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1400-2_19.

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Dittert, N., K. H. Baumann, T. Bickert, R. Henrich, R. Huber, H. Kinkel, and H. Meggers. "Carbonate Dissolution in the Deep-Sea: Methods, Quantification and Paleoceanographic Application." In Use of Proxies in Paleoceanography, 255–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58646-0_10.

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Conference papers on the topic "Dissolution des carbonates"

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Yan*, Xinfei, Zhifang Yang, Minghui Lu, and Xiaoming Li. "Effect of dissolution on acoustic properties in tight carbonates." In SPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016. Society of Exploration Geophysicists and Society of Petroleum Geophysicists, 2016. http://dx.doi.org/10.1190/igcbeijing2016-127.

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Ivanishin, Igor, and Hamidreza Samouei. "Chelating Agents as a Stimulation Fluid with a Negative Reaction Order: More Diluted Solutions React Faster with Carbonates." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206376-ms.

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Abstract Chelating agents are used to stimulate high-temperature carbonate reservoirs and remove mineral scales. For field applications, commercial chelates—EDTA, DTPA, GLDA, etc.—are commonly supplied as 3550 wt% (1.2-1.7 M) solutions and diluted two times in water. However, the dependence of the reaction rate on the concentration of chelate in solution has never been quantified. This paper focuses on determining the kinetics of calcite dissolution as a function of the dilution factor of commonly used chelates at acidic pH. Using a rotating disk apparatus, the kinetics of calcite marble dissolution in 0.10.25 M EDTA (pH=4.9-5.0), 0.1-0.25 M DTPA (pH=3.5-5.0), and 0.28-0.85 M GLDA (pH=3.7-5.0) solutions has been investigated. The dissolution of calcite in all chelates has a negative fractional-order that increases with temperature in the range -0.6 < n< -1.9. Thus, less concentrated chelate solutions react faster with calcite, and the effect of chelate dilution becomes less pronounced with a temperature increase. For example, three times dilution of pH=3.7 commercial GLDA solution—from commonly used 50 vol% (0.85 M) to 16.7 vol% (0.28 M)—increases calcite dissolution rate 8.4, 4.9, 2.7, and 2.0 times at 98.6, 116.6, 134.6, and 188.6°F, respectively. Dilution of pH=5.0 EDTA and pH=3.5 DTPA from 0.25 M to 0.1 M increases the dissolution rate of calcite 1.4-3.1 times at 98.6-188.6°F. Probable reasons for such an unusual reaction behavior are discussed in the paper. Presented results are integral for designing the stimulation operations in carbonate reservoir rocks and the removal of carbonate scales.
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Scaccia, Silvera, and Stefano Frangini. "Effect of Various Electrolyte Compositions on the NiO Degradation in Molten Carbonates." In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74045.

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In the present paper we report the NiO solubility in a variety of alkali carbonate compositions in presence of MgO, CaCO3, BaCO3 and La2O3 additions under different conditions of gas composition and temperature. Two types of binary eutectic melts were chosen, namely the standard electrolyte (62–38) (Li-K)2CO3 and (52–48) % (Li-Na)2CO3 mixtures. The ternary eutectic melt chosen was (43.5-31.5-25.0) mol % (Li-Na-K)2CO3. The observed reduction of NiO solubility induced by the additives can be explained in terms of a higher basic character of all the modified electrolytes, although the NiO dissolution still follows an acidic dissolution mechanism in all the conditions under study.
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Uetani, T., H. Kaido, and H. Yonebayashi. "Investigation of Anhydrite Dissolution as a Potential Low Salinity Waterflooding Mechanism in Carbonates." In IOR 2019 – 20th European Symposium on Improved Oil Recovery. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201900125.

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Jain, Jinesh C., Christian L. Goueguel, Dustin L. McIntyre, and Harry M. Edenborn. "DISSOLUTION OF MINERAL CARBONATES WITH INCREASING CO2 PRESSURE AND THE IMPLICATIONS FOR CARBON SEQUESTRATION LEAK DETECTION." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-285141.

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Tumiati, Simone, Sandro Recchia, Laurent Remusat, Carla Tiraboschi, Dimitri A. Sverjensky, and Stefano Poli. "Dissolution of Subducted Ocean Carbonates and Organic Matter Controls the Carbon Isotopic Signature of the Mantle Wedge." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2635.

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Yokoyama, Tadashi, and Naoki Nishiyama. "Modeling and Experiments on Dissolution of Minerals Under the Presence of Air in Pores: Difference in Silicates and Carbonates." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3032.

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Wu, Weiwei, and Mukul M. Sharma. "Acid Fracturing Shales: Effect of Dilute Acid on Properties and Pore Structure of Shale." In SPE Hydraulic Fracturing Technology Conference. SPE, 2015. http://dx.doi.org/10.2118/spe-173390-ms.

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Abstract Many microfractures created during hydraulic fracturing are too small to be filled with proppants and are likely closed during production. However, for some shales that are rich in calcite (calcareous mudstones), such as the Bakken and Eagle Ford shale, dilute acids can be used while fracturing to maintain the conductivity of these microfractures under closure stress by non-uniformly etching the fracture surfaces. The mineralogy and pore structure of the shale and their evolution during acid fracturing are critical factors on the surface surface etching profile and the fluid leakoff. Therefore, understanding how acid dissolution changes the microstructure, petrophysical properties and pore structures of shale is essential in the design and application of acid fracturing in shales. In this paper changes in shale properties and pore structure by acid fracturing were demonstrated and visually observed for the first time with a scanning electron microscope. Acidized sections of a shale core sample were carefully isolated, and its microstructure, pore structure and petrophysical properties were systematically studied and compared with non-acidized sections of the core. Microstructure changes were found to be strongly dependent on mineral distribution, and several patterns were identified: channels developed in carbonate-rich regions; cavities or grooves formed in carbonate-rich islands or carbonate rings; and surface roughness was created in mixed zones of scattered carbonate and inert minerals. Inert minerals such as clay, organic matter stay relatively undisturbed in the structure, while some mineral grains can be dislodged from their original locations by dissolution of the surrounding carbonates. Many macropores with size up to 120 µm were created and mesopores mostly associated with clay gained more accessibility. Significantly increased permeability and porosity was measured in an acidized shale matrix. Brinell hardness measurements show that, as expected, the hardness of the shale was reduced by acidizing. This means that for acidizing to work effectively, it is important to not etch the fracture surfaces uniformly. Doing so will result in a reduction in the fracture conductivity under stress. The microstructure changes introduced by acid fracturing demonstrated in this study will result in the formation of surface asperities which is likely to improve the fracture conductivity of induced unpropped fractures. The acidized shale matrix close to the fracture surface with increased abundance of macropores and accessibility to mesopores may serve as a preferred pathway for fluid flow as well.
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Yuan*, Guanghui, YIngchang Cao, Zhenzhen Jia, and Yanzhong Wang. "Selective Dissolution of Feldspars in the Presernct of Carbonates: The Way to Generate Secondary Pores in Buried Sandstones by Organic CO2." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2205644.

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Baghishov, Ilgar, Gayan A. Abeykoon, Mingyuan Wang, Francisco J. Argüelles Vivas, and Ryosuke Okuno. "Glycine for Enhanced Water Imbibition in Carbonate Reservoirs – What is the Role of Amino Group?" In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206294-ms.

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Abstract Previous studies indicated the efficacy of the simplest amino acid, glycine, as an aqueous additive for enhanced water imbibition in carbonate reservoirs. The objective of this research was to investigate the importance of the amino group of glycine in its enhanced water imbibition. To this end, glycine was compared with two carboxylates (acetate and formate) with/without adding hydrogen chloride (HCl) for adjusting the solution pH. Note that the amino group is the only difference between glycine and acetate. Contact-angle experiments on calcite were carried out at 347 K and atmospheric pressure with 68000-ppm reservoir brine (RB), and 4 different concentrations of glycine, acetate, and formate solutions in RB. To test the hypothesis that calcite dissolution is one of the main mechanisms in wettability alteration by glycine, we performed another set of contact angle experiments by adding HCl to brine, acetate, and formate solutions. HCl was added to match the pH of the glycine solution at the same concentration. We also performed imbibition tests with Texas Cream Limestone cores at 347 K with brine, glycine, acetate, and formate solutions (with and without HCl) in RB at 5.0 wt%. Contact-angle results indicated that glycine changed calcite's wettability from oil-wet to water-wet (45°). However, acetate solution was not able to change the wettability to water-wet; and formate moderately decreased the contact angle to 80°. The pH level increased from 6.1 to 7.6 after the contact angle experiment in glycine solution, indicating the consumption of hydrogen ions due to calcite dissolution. The levels of pH in formate and acetate solutions, however, decreased from 8.4 to 7.8. The acidity of glycine above its isoelectric point arises from the deprotonation of the carboxyl group. Imbibition tests with carbonate cores supported the observations from the contact-angle experiments. The oil recovery was 31% for glycine solution, 20% for RB, 21% for formate solution, and 19% for acetate solution. This re-confirmed the effectiveness of glycine as an additive to improve the oil recovery from carbonates. An additional set of imbibition tests revealed that acetate at the pH reduced to the same level as glycine was still not able to recover as much oil as glycine. This showed that glycine recovered oil not only because of the calcite dissolution and the carboxyl group, but also because of the amino group. It is hypothesized that the amino group with its electron donor ability creates a chelation effect that makes glycine entropically more favorable to get attached to the calcite surface than acetate. Another important result is that the formate solution at an adjusted pH resulted in a greater oil recovery than RB or RB at the same pH. This indicates that there is an optimal pH for the carboxyl group to be effective in wettability alteration as also indicated by the pH change during the contact-angle experiment.
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Reports on the topic "Dissolution des carbonates"

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Caldeira, K., K. Knauss, and G. Rau. Accelerated Carbonate Dissolution as a CO2 Separation and Sequestration Strategy. Office of Scientific and Technical Information (OSTI), February 2004. http://dx.doi.org/10.2172/15009791.

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James W. Castle, Ronald W. Falta, David Bruce, Larry Murdoch, Scott E. Brame, and Donald Brooks. Fracture Dissolution of Carbonate Rock: An Innovative Process for Gas Storage. Office of Scientific and Technical Information (OSTI), October 2006. http://dx.doi.org/10.2172/918425.

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Duckworth, Owen W., Randall Timothy Cygan, and Scot T. Martin. Macroscopic rates, microscopic observations, and molecular models of the dissolution of carbonate phases. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/919119.

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Nam, Suk Woo, Hyung-Joon Choi, and Tae Hoon Lim. Modeling and simulation of NiO dissolution and Ni deposition in molten carbonate fuel cells. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/460244.

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Edwards, T., K. Hera, and C. Coleman. EVALUATION OF ARG-1 SAMPLES PREPARED BY CESIUM CARBONATE DISSOLUTION DURING THE ISOLOK SME ACCEPTABILITY TESTING. Office of Scientific and Technical Information (OSTI), December 2011. http://dx.doi.org/10.2172/1031052.

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Edwards, Thomas. Phase II of a Six sigma Initiative to Study DWPF SME Analytical Turnaround Times: SRNL's Evaluation of Carbonate-Based Dissolution Methods. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/881427.

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Effects of acid deposition on dissolution of carbonate stone during summer storms in the Adirondack Mountains, New York, 1987-89. US Geological Survey, 1994. http://dx.doi.org/10.3133/wri934189.

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