المؤلفون: Christophe N. Peyrefitte, Dominique Rousset, Boris A.M. Pastorino, Regis Pouillot, Maël Bessaud, Fabienne Tock, Helene Mansaray, Olivier L. Merle, Aurelie M. Pascual, Christophe Paupy, Aurelia Vessiere, Patrice Imbert, Patrice Tchendjou, Jean-Paul Durand, Hugues J. Tolou, Marc Grandadam

المصدر: Emerging Infectious Diseases, Vol 13, Iss 5, Pp 768-768 (2007)

مصطلحات موضوعية: Chikungunya virus, alphavirus, Dengue viruses, arbovirus, Cameroon, dispatch, Medicine, Infectious and parasitic diseases, RC109-216

الوصف: We report the isolation of chikungunya virus from a patient during an outbreak of a denguelike syndrome in Cameroon in 2006. The virus was phylogenetically grouped in the Democratic Republic of the Congo cluster, indicating a continuous circulation of a genetically similar chikungunya virus population during 6 years in Central Africa.

وصف الملف: electronic resource

العلاقة: https://wwwnc.cdc.gov/eid/article/13/5/06-1500_articleTest; https://doaj.org/toc/1080-6040Test; https://doaj.org/toc/1080-6059Test

الوصول الحر: https://doaj.org/article/e66f10501309454e97264850dc75bcc7Test

المؤلفون: Jean-Philippe Blouet, Gerard Dupont, Sutieng Ho, Anneleen Foubert, Patrice Imbert

المصدر: AAPG Bulletin. 105:1033-1064

مصطلحات موضوعية: Outcrop, 020209 energy, Geochemistry, Energy Engineering and Power Technology, Geology, Context (language use), 02 engineering and technology, Structural basin, Cretaceous, chemistry.chemical_compound, Petroleum seep, Fuel Technology, chemistry, Stratigraphy, Geochemistry and Petrology, 0202 electrical engineering, electronic engineering, information engineering, Earth and Planetary Sciences (miscellaneous), Carbonate, Oil shale

الوصف: Despite the obvious link between hydrocarbon seepage at the surface and the activity of petroleum systems at depth, the majority of studies on seep carbonates concentrate on shallow aspects, whereas they are rarely oriented toward a source-to-sink perspective. Here, seep carbonates are conceptualized as a key element for analyzing petroleum systems at basin scale. Mapping of a 150-m-thick, 200-m-wide outcrop of the Lower Cretaceous slope wedge of the southeastern France Basin reveals two distribution patterns of seep carbonate concretions: (1) aligned in a continuous bed secant to the stratigraphy and (2) clustered in patches vertically stacked over 35 m. The δ13C signatures of the seep carbonates as light as −40‰ Peedee belemnite point toward a biogenic methane–dominated seepage. A set of turbidite channels pinching out right below the seep carbonates is seen as a potential gas trap, whereas biostratigraphic analysis indicates that the channels are coeval with a prominent black shale in the center of the basin. Any biogenic methane generated by the black shale could have used the channels as drains up to their pinch-out. The switch from a continuous seep carbonate level to stacked patches suggests initial widespread capillary leakage, followed by the opening of a preferential migration pathway. The distribution of seep carbonates thus appears dominated by breaching mechanisms of reservoir–cap-rock seals. This case study illustrates how seep carbonate mapping, in combination with the tectono-sedimentary context of each basin, may be a valuable tool for petroleum geologists.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::8ab4049abb453fba6621490fa5e6047eTest
https://doi.org/10.1306/06192019025Test

المؤلفون: Guillaume Michel, Stéphanie Dupré, Agnès Baltzer, Axel Ehrhold, Patrice Imbert, Mathilde Pitel, Benoît Loubrieu, Carla Scalabrin, Pascal Lazure, Louis Marié, Jean-Baptiste Geldof, Éric Deville

المساهمون: Handled by Isabelle Manighetti

وصف الملف: application/pdf; image/vnd.djvu

العلاقة: CRGEOS_2017__349_8_391_0; https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.1016/j.crte.2017.10.003Test/; oai:centre-mersenne.org:CRGEOS_2017__349_8_391_0; citation: Comptes Rendus. Géoscience, 349, no. 8 (2017) p 391-401

المؤلفون: Patrice Imbert, Vincent Riboulot, M. Voisset, Antonio Cattaneo

المصدر: Terra Nova (0954-4879) (Wiley), 2019-12, Vol. 31, N. 6, P. 540-548

مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, Geology, 14. Life underwater, Geophysics, 010502 geochemistry & geophysics, 01 natural sciences, Stability (probability), Seafloor spreading, 0105 earth and related environmental sciences

الوصف: Fluid migration within the sedimentary column contributes significantly to slope failure and pockmark formation and can be an effective triggering mechanism to generate submarine landslides. Pockmarks are thus commonly listed among geohazards. Contrary to these accepted notions, we propose here an alternative view of pockmarks with an example from the Eastern Niger Submarine Delta: Pockmarks and associated chimneys may increase or modify the shear strength of sedimentary layers and locally enhance seafloor stability. The analysis of two 3D seismic volumes shows that a landslide deposit divides into two branches around a cluster of three pockmark chimneys, interpreted to impede its further development. The morphological characteristics of a slide constrained by fluid seepage features show the potential role of fluid escape in marine sediment strengthening.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24b2fbdadadee509c1d93c95980cdc7eTest
https://doi.org/10.1111/ter.12425Test

المؤلفون: Patrice Imbert, Dominique Dubucq, Lies Loncke, Damien Dhont, Romain Jatiault

المساهمون: Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Centre scientifique et Technique Jean Feger (CSTJF), TOTAL FINA ELF

المصدر: Marine and Petroleum Geology
Marine and Petroleum Geology, Elsevier, 2019, 103, pp.753-772. ⟨10.1016/j.marpetgeo.2018.11.026⟩

مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Stratigraphy, Thermogenic seeps, Structural basin, 010502 geochemistry & geophysics, Oceanography, 01 natural sciences, Oil slicks, Gas hydrate stability zone, Double BSR, 0105 earth and related environmental sciences, Feature (archaeology), Lower Congo basin, Salt diapir, Asphalt, Geology, Geophysics, Diapir, Seafloor spreading, Salt tectonics, Overburden, Petroleum seep, Pockmarks, Economic Geology, Gas hydrates

الوصف: International audience; We report the geophysical characterisation of natural oil seep sites through a combination of sea surface evidence of oil leakage from spatial imagery with a large collection of seafloor and subsurface geophysical data. This paper provides a detailed characterisation of one selected active seep site and identifies possible specific feature of oil seep sites. The oil seep is a complex-shaped feature on the seafloor consisting of a cluster of heterometric pockmarks inside a main depression area and peripheral metre-scale seafloor mounds. A strong deformation related to salt tectonics controls the location of the seafloor source by fracturing the overburden. The associated thermal anomaly induces a vertical modification position of the base of the gas hydrate stability zone (BGHSZ) that is used as a fluid migration route towards the crest of the diapir. The combination of local depressions and seafloor amplitude anomalies linked with vertical high-amplitude pipes rooted on the BGHSZ suggests a focused fluid flow towards the seafloor. In peripheral areas, the seafloor mounds are linked by shallow faults to buried high amplitude patches on sub-bottom profiler sections. The combination of restricted-size seafloor mounds with a progressive deepening of the high amplitude from the seafloor suggests a substantial decrease of the hydrocarbon flow towards peripheral areas. The proximity of actively oil-supplying seafloor depressions and seafloor mounds shows that the hydrocarbon flow rapidly decreases laterally. The thermogenic seep site is affected by two consistent and sub-parallel reflections with negative polarity. The first is interpreted as the methane-related BGHSZ, the second could correspond to the base of a thermogenic BGHSZ produced by a mixture of heavier gas. The seafloor roughness and double BSR appear to be specific features of oil seep sites. The geophysical features revealed at a localised study area will be extrapolated towards a larger province for relevance validation.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::56337fff154ab538d1927dc68d286426Test
https://doi.org/10.1016/j.marpetgeo.2018.11.026Test

المؤلفون: Romain Jatiault, Patrice Imbert, Lies Loncke, Dominique Dubucq, Damien Dhont

المساهمون: Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Centre scientifique et Technique Jean Feger (CSTJF), TOTAL FINA ELF

المصدر: Marine and Petroleum Geology
Marine and Petroleum Geology, Elsevier, 2019, 103, pp.773-791. ⟨10.1016/j.marpetgeo.2019.02.002⟩

مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Stratigraphy, Structural basin, 010502 geochemistry & geophysics, Oceanography, 01 natural sciences, Oil slicks, Gas hydrate stability zone, Thermogenic fluid seeps, Bathymetry, Double BSR, Seabed, 0105 earth and related environmental sciences, Lower Congo basin, Salt diapir, Asphalt, Geology, Geophysics, Diapir, Seafloor spreading, Petroleum seep, Pockmarks, 13. Climate action, Economic Geology, Sedimentary rock, Gas hydrates

الوصف: International audience; The Lower Congo Basin is known to discharge a substantial volume of oil towards the sea surface, from more than one hundred seafloor seep sites distributed throughout the deep province of the Lower Congo Basin. A large geochemical coring survey confirmed the presence of oil on the seabed. The combination with the seismic data considerably improved the identification of the origin of the oil slicks on the seabed. Multiple specific geophysical characteristics of thermogenic hydrocarbon seep sites were highlighted in a previous detailed analysis of seismic datasets. This study aims to test the characteristics previously identified at regional-scale. The active discharge zone is limited to the distal province of the basin. It is characterised by strong compression/shortening due to the sliding of the post-salt super-sequence, resulting in numerous salt diapirs that control the location of seafloor oil seep sites. The paper describes the bathymetric, reflectivity, amplitude and sub-bottom profiler characteristics of a group of thermogenic seep sites. They correspond essentially to submarine mounds or pockmarks of complex and irregular shape surrounded by hummocky mounds. Active oil pockmarks are systematically associated with positive amplitude anomalies on the seabed and are linked to vertical high-amplitude columns rooted in the seismic reflector and associated with the base of the gas hydrate stability zone. The sub-bottom profiler data shows that the hummocky mounds are connected by a network of faults to high-amplitude bodies buried under a consistent sediment thickness. Based on the definition of specific geophysical features (seafloor mounds, complex shape and irregular pockmarks, positive anomalies of seafloor amplitude, high-amplitude vertical pipes), we identified a series of potential oil seep sites at basin scale. The mounds are particularly recognizable using the seismic curvature attribute; we have identified 2946 individual hummocks that are grouped in 50 zones with a density of 35–240 per km2. They are believed to be associated with asphalt storage on the seafloor and related to the biodegradation of heavy oils during hydrocarbon dysmigration through the sedimentary pile. Unusual double BSRs occur over the study area; these are also a specific feature of thermogenic seep sites. Barely half of the potential sites identified on the seismic datasets are associated with recurrent oil slicks at the sea surface. The proportion of remaining anomalies may be associated with inactive seep sites over the period of satellite-based monitoring or gas-dominated seep sites.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46a8a8396dad2dd49f48b514a0fb6d63Test
https://doi.org/10.1016/j.marpetgeo.2019.02.002Test

المؤلفون: Jean-Paul Callot, Patrice Imbert, Nabil Sultan, Arthur Blouin, Alexandra Pierron

المصدر: Journal Of Geophysical Research-earth Surface (2169-9003) (American Geophysical Union (AGU)), 2020-12, Vol. 125, N. 12, P. e2020JF005623 (27p.)

مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, methane, Numerical modeling, 01 natural sciences, Methane, chemistry.chemical_compound, numerical modeling, Geophysics, chemistry, mud volcano, geohazard, 13. Climate action, Basin modelling, Seismic interpretation, Geohazard, Petrology, sediment remobilization, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes, Mud volcano

الوصف: Submarine mud volcanoes are one of the most spectacular methane expulsion features at the seafloor and they represent a significant geohazard worldwide. In this work we focus on the physical processes controlling the initiation and early evolution of the Absheron mud volcano (AMV). Our analyses were carried out based on basin modeling calibrated thanks to existing seismic interpretation of the AMV, analysis of sediment samples from seabed, and data from two exploration wells. Acquired laboratory geotechnical data allowed us to derive laws considering the impact of gas exsolution on host sediment behaviors. In this study, we identified key geological and physical conditions that led to mud volcano formation: by coupling diffusion processes with hydrofracturing and fluid advection, we were able to simulate the conditions required to generate mud 3.5 km below the AMV. Mud remobilization up to the seabed was reproduced by using Navier‐Stokes equations modified to account for the impact of gas expansion on mud density. Considering density inversion only, simulations indicate that mud would be extruded at the seabed 100 years after its generation, an ascent rate similar to extrusion rates measured at the active Kotyrdag mud volcano in Azerbaijan. This article is protected by copyright. All rights reserved. Plain Language Summary Mud volcanoes build‐up at the Earth surface from liquidized sediments remobilized from depths reaching several kilometers. They are distributed globally, onshore and offshore, in different geological backgrounds and represent serious geohazards for people and infrastructures. Moreover, they are also among the most spectacular methane expulsion features at the surface, participating to the global budget of green‐house gases emissions. Their understanding is thus paramount to prevent natural catastrophes such as Lusi eruption in Indonesia in 2006 and to quantify the human impact on global warming. If mud volcanoes are known for centuries (Pline the Elder) and studied for decades, little is known about the processes controlling mud generation from stiff deep sediments and its vertical migration towards the surface. The methane is often considered as being a driving element in this geological process and bubble formation in compacted sediments during laboratory testing led to strong damage of sediment properties. Here we develop two independent numerical models, based on simple physical processes and relying on in‐situ observations of the Absheron Mud Volcano (South Caspian Basin) and laboratory testing. They allow to simulate mud generation at depth and its remobilization to the surface. Our research work provides reliable information to describe the initiation and early evolution of an active mud volcano.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::771eea757a7d622ff52244b5f2c24821Test
https://doi.org/10.1029/2020jf005623Test

المؤلفون: Germinal Gabalda, Adil A. Aliyev, Dominique Remy, Matthieu Dupuis, Orhan R. Abbasov, Victoria Bichaud, Patrice Imbert, Elnur E. Baloglanov, Remy Juste, Sylvain Bonvalot, Francis Odonne

المصدر: Marine and Petroleum Geology. 134:105315

مصطلحات موضوعية: geography, geography.geographical_feature_category, Plateau, Stratigraphy, Mass deficit, Geology, Conical surface, Oceanography, Geophysics, Volcano, Caldera, Economic Geology, Compression (geology), Density contrast, Petrology, Mud volcano

الوصف: We compared the structure of two flat and two conical mud volcanoes (MV) in Azerbaijan in order to understand what governs the morphological contrast. We paid particular attention to the structural evolution of the surface, as observed in the field over 5 years and as monitored by satellite images revealing surface activity over that period; in addition, we acquired microgravity measurements to probe deeper structure. The combination of these data reveals in all studied volcanoes significant mass deficit concentric with the surface edifice. Modeling indicates that the mass deficit is consistent with a chamber underlying the summit caldera of conical MVs and the plateau of flat MVs, with a thickness of several hundred meters for a density contrast of 500 kg/m3 between the chamber mud and the surrounding solid mud. Surface structures and their evolution during and in between eruptions provide insight into the depth of the mud chamber, which lies within a few meters of the surface for flat mud volcanoes and one to several hundred meters deep for conical ones. Surface structures and satellite-derived deformation analysis shows that flat mud volcanoes grow by radial expansion and compression of the flanks distributed all around the edifice. In contrast, conical mud volcanoes grow by flow stacking in the summit caldera, deformation being constrained by the caldera rim; excess mud supply is accommodated by occasional rim breaching and mud overflow into flank gullies.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::9757678ea7c0f11717579a829800eb6fTest
https://doi.org/10.1016/j.marpetgeo.2021.105315Test

المؤلفون: Dominique Remy, Francis Odonne, Orhan R. Abbasov, Bruno C. Vendeville, Victoria Bichaud, Remy Juste, Maëlys Pain, Germinal Gabalda, Patrice Imbert, Adil A. Aliyev, Anthony Dofal, Mathieu Gertauda, Arthur Blouin, Matthieu Dupuis, Elnur E. Baloglanov

المساهمون: Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), TOTAL-Scientific and Technical Center Jean Féger (CSTJF), TOTAL FINA ELF, Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR), Centre National de la Recherche Scientifique (CNRS)-Université de Pau et des Pays de l'Adour (UPPA)-TOTAL FINA ELF, IFREMER, Unite Rech Geosci Marines, Lab Geophys & Enregistrements Sedimentaires, Plouzane, France., Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Centre scientifique et Technique Jean Feger (CSTJF), TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Aléas géologiques et Dynamique sédimentaire (LAD), Géosciences Marines (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)

المصدر: Marine and Petroleum Geology
Marine and Petroleum Geology, Elsevier, 2020, 112, pp.104051. ⟨10.1016/j.marpetgeo.2019.104051⟩
Marine and Petroleum Geology, 2020, 112, pp.104051. ⟨10.1016/j.marpetgeo.2019.104051⟩
Marine And Petroleum Geology (0264-8172) (Elsevier BV), 2020-02, Vol. 112, P. 104051 (22p.)

مصطلحات موضوعية: Azerbaijan, 010504 meteorology & atmospheric sciences, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Stratigraphy, Direct observation, Soft mud, Flat-topped mud-volcanoes, Geology, Crust, 010502 geochemistry & geophysics, Oceanography, 01 natural sciences, Resistivity-gravity data, Low-density mud at depth, Geophysics, 13. Climate action, Growth of flat mud volcanoes, Economic Geology, Mudflows stacking, Petrology, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Mud volcano

الوصف: We investigated the mode of growth of flat-topped mud volcanoes, through the study of three active edifices onshore Azerbaijan: they are the Bozdag-Guzdek, the Ayazakhtarma and the Akhtarma-Pashaly mud volcanoes. The three edifices are up to 80 m high and 3 km wide, and the recurrence time between eruptions from a few months to a few years. Surface changes during and between eruptions were documented by a combination of mapping from satellite pictures, repeated direct observation over five years and structural analysis. In addition, resistivity profiles and microgravity measurements were used to decipher their subsurface geometries. We interpret the flat-topped character of the mud volcanoes as the result of rapid “isostatic” readjustment of a brittle surface crust, < 1 m to tens of meters thick, overlying a ductile layer. The surface structure typically shows a concentric transition from an extensional regime in the vicinity of the emission center, to strike slip movements in a median ring, to a compressional regime with thrusts, and pop-up blocks or folds in the outer part of the plateau. Both the flat surface of these mud volcanoes and observed radial displacements of the surface, combined with the very low Bouguer anomaly of the Ayazakhtarma mud volcano, give arguments to propose that km-diameter, flat-topped mud volcanoes likely reflect the presence at a shallow depth (a few tens of meters?) of a large volume of soft mud. Rapid compaction at the surface forms a crust that moves away from a central feeding area, thereby transferring mud added at the center into lateral spreading, building a Coulomb prism all around the mud volcano and strongly limiting vertical buildup.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::423236f01da36c3864b7269d42e7d6c5Test
https://hal.archives-ouvertes.fr/hal-02898360Test

المؤلفون: Nabil Sultan, Patrice Imbert, Jean-Paul Callot, Arthur Blouin

المساهمون: Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR), TOTAL FINA ELF-Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre scientifique et Technique Jean Feger (CSTJF), TOTAL FINA ELF, TOTAL-Scientific and Technical Center Jean Féger (CSTJF)

المصدر: Engineering Geology
Engineering Geology, Elsevier, 2019, 263, pp.105313. ⟨10.1016/j.enggeo.2019.105313⟩
Engineering Geology (0013-7952) (Elsevier BV), 2019-12, Vol. 263, P. 105313 (18p.)

مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, 0211 other engineering and technologies, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Preconsolidation pressure, 02 engineering and technology, 01 natural sciences, Gassy sediments, 14. Life underwater, Total pressure, Petrology, Mud volcano, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Consolidation (soil), Gas exsolution, Sediment, Geology, Consolidation testing, Geotechnical Engineering and Engineering Geology, Sediment damage, Permeability (earth sciences), 13. Climate action, Compressibility, Saturation (chemistry)

الوصف: Gassy sediments are common in marine environments and are characterized by a specific mechanical behavior significantly different from that of water-saturated sediments. It is shown that gas causes damage and initiates fractures in sediments. To define the controlling parameters dominating the damage process during gas exsolution and its consequences in terms of hydro-mechanical behavior, we developed a specific consolidation apparatus to test sediments collected from the active Absheron Mud Volcano. Indeed, mud volcano formation is initiated by gas exsolution and subsequent mud generation at depth from stratified sediments. Gas was generated in the samples by circulating carbonated water through the fine-grained sediments, then decreasing the total pressure. Particular attention was given to the impact of gas saturation and associated damage and fractures on P-wave velocity, sediment compressibility, permeability and preconsolidation pressure. Results show that fracture geometry is mainly controlled by the degree of gas saturation and preconsolidation pressure. The damage level increases with the degree of gas saturation while the elastic modulus of sediments is degraded. Experimental data show that sediments do not entirely recover their original mechanical behavior when gas dissipates. Finally, the experimental data confirm that gas exsolution and expansion is a key mechanism for mud generation.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd41ff45118370416750f28d0192db76Test
https://hal.archives-ouvertes.fr/hal-02377189/file/S0013795219309676.pdfTest