Storm-induced concentration of sulfurized, marine-origin, organic matter as a possible mechanism in the formation of petroleum source-rock
| Autor: | Marion Delattre, Jean-Noel Ferry, Hichem Koched, Nicolas Tribovillard, Thierry Adatte, Romain Abraham, François Baudin |
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| Přispěvatelé: | Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), Institut des Sciences de la Terre de Paris (iSTeP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Lausanne = University of Lausanne (UNIL), Université de Genève = University of Geneva (UNIGE), TOTAL S.A., TOTAL FINA ELF |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Boulonnais Stratigraphy Late Jurassic Geochemistry [SDU.STU]Sciences of the Universe [physics]/Earth Sciences engineering.material 010502 geochemistry & geophysics Oceanography 01 natural sciences Remobilization Sedimentary structures Sulfurized organic matter Organic matter 0105 earth and related environmental sciences Horizon (geology) chemistry.chemical_classification Geology Anoxic waters Geophysics Source rock chemistry [SDU]Sciences of the Universe [physics] engineering Orange amorphous organic matter Economic Geology Sedimentary rock Pyrite Oil shale |
| Zdroj: | Marine and Petroleum Geology Marine and Petroleum Geology, 2019, 109, pp.808-818. ⟨10.1016/j.marpetgeo.2019.07.003⟩ |
| ISSN: | 0264-8172 |
| Popis: | International audience; Black shales, though laminated, are not systematically synonymous with quiet conditions of deposition. A number of papers report about black shales yielding sedimentary structures echoing relatively high hydrodynamic conditions. Here we examine two sedimentary sequences pertaining to the Late Jurassic Argiles de Châtillon Formation of the Boulonnais area (Northernmost France), each of them including a meter-thick black-shale horizon. The two laminated black shales contain sulfurized (i.e., organic S-rich) organic matter, reaching a maximum of 9%. However, some differences set the two black shales apart. The lower one was deposited under calm, suboxic to anoxic, bottom-water conditions (the « classic » way); the upper black shale was deposited under oxic, agitated bottom-water conditions, not compatible with stable sulfidic conditions required for organic-matter sulfurization. The upper black shale experienced hydrodynamically-induced concentration of sulfurized, recalcitrant organic matter of marine origin. The sulfurized organic matter could be preserved and quantitatively accumulated owing to its non-putrescible nature, leading to the formation of a potential hydrocarbon source rock. The association of pyrite inclusions with sulfurized organic matter probably modified the hydrodynamic behavior of organic particles. The storm-induced remobilization and concentration of sulfurized organic matter implies that the “sulfurization factory” operated in proximal, shallow environments such as estuaries, mud flats or mangrove environments. Such a model is in agreement with findings from modern coastal/shelf environments (notably mangroves) and fully transposable to many other sedimentary situations of any geological time period. |
| Databáze: | OpenAIRE |
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