Academic Journal
The diagenetic history of the giant Lacq gas field, witness to the apto-albian rifting and the Pyrenean orogeny, revealed by fluid and basin modeling
| العنوان: | The diagenetic history of the giant Lacq gas field, witness to the apto-albian rifting and the Pyrenean orogeny, revealed by fluid and basin modeling |
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| المؤلفون: | Elias Bahnan, Alexy, Pironon, Jacques, Carpentier, Cédric, Barré, Guillaume, Gaucher, Eric |
| المساهمون: | GeoRessources, Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Centre scientifique et Technique Jean Feger (CSTJF), TotalEnergies ( Total Energies. Anciennement : Total, TotalFina, TotalFinaElf ), Laboratoire des Fluides Complexes et leurs Réservoirs (LFCR), Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), TOTAL EP-R&D and the Center de Recherches sur la Géologie des Matières Premières Minérales et Energétiques (CREGU), contract number FR00008500 - CREGU/T25. |
| المصدر: | ISSN: 0264-8172 ; Marine and Petroleum Geology ; https://hal.univ-lorraine.fr/hal-03413485 ; Marine and Petroleum Geology, 2021, 133, pp.105250. ⟨10.1016/j.marpetgeo.2021.105250⟩. |
| بيانات النشر: | HAL CCSD Elsevier |
| سنة النشر: | 2021 |
| المجموعة: | Aix-Marseille Université: HAL |
| مصطلحات موضوعية: | Lacq petroleum system, Aquitaine basin, Fluid inclusion modeling, Basin modeling, Sulfur-rich fluid system, TSR, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology, [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
| الوصف: | International audience ; The link between fluid circulation schemes and basin histories remain one of the most valuable tools to un-derstand the diagenetic evolution of petroleum reservoirs. This study proposes a diagenetic model for the DeepLacq reservoir constrained by petrography, geochemistry, fluid inclusions studies and basin modeling analyses.Drill cores penetrating the 3000 m deep Late Jurassic to Early Cretaceous “Deep Lacq” reservoirs, in the Aqui-taine basin SW France, were used to investigate how the geodynamic evolution of the basin influenced thediagenesis of petroleum reservoirs. This basin experienced a phase of rifting during the Lower Cretaceous fol-lowed by inversion and compression during the Paleogene. Petrographic and geochemical results indicate thatearly diagenesis involved bacterial activity and early dolomitization. Fluid thermodynamic modeling, coupledwith the reconstruction of the basin history provided insight into the timing of diagenetic fluid circulations.Burial diagenesis involved a rift-related dolomitization episode linked mainly to the recrystallization of earlierdolomites and the circulation of deep hot fluids connected to the Triassic evaporites. The dolomitizing fluidscirculated at temperatures close to 136–144 ◦C and pressures of 338–386 bars, during the Aptian (120-116 Ma).During the post-rift uplift and its subsequent thermal re-equilibration, multiple fluid pulses precipitated coarseblocky calcites. These Ca-rich fluids circulated between 109 and 97 Ma, at high-pressure conditions at around of704–766 bars and with temperatures of 146–156 ◦C. The circulation of another fluid pulse that resulted in theprecipitation of anhydrite cements is linked to the onset of the Pyrenean orogeny. No evidence that support in-situ TSR reactions were found, which suggests migration of TSR-related H2S from a kitchen in the deeper parts ofthe basin. This multi-modeling approach shows how the detailed thermodynamic analyses of fluid inclusions canadd valuable constraints on a diagenetic ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1016/j.marpetgeo.2021.105250 |
| الاتاحة: | https://hal.univ-lorraine.fr/hal-03413485 https://hal.univ-lorraine.fr/hal-03413485v1/document https://hal.univ-lorraine.fr/hal-03413485v1/file/S0264817221003536.pdf https://doi.org/10.1016/j.marpetgeo.2021.105250 |
| Rights: | http://creativecommons.org/licenses/by-nc/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.ED757ADC |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.marpetgeo.2021.105250 |
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