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Paleo-oil reservoir pyrolysis and gas release in the Yangtze Block imply an alternative mechanism for the Late Permian Crisis

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Geoscience Frontiers 2022年第2期13卷 125-138页

作者： Chengyu Yang Meijun Li Zhiyong Ni Tieguan Wang Nansheng Qiu Ronghui Fang Long Wen State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)College of GeosciencesChina University of Petroleum(Beijing)Beijing 102249China Key Laboratory of Exploration Technologies for oil and Gas Resources(Yangtze University) Ministry of EducationCollege of Resources and EnvironmentYangtze UniversityWuhanHubei 430100China oil&Gas Survey China Geological SurveyBeijing 100083China The Key Laboratory of Unconventional Petroleum Geology China Geological SurveyBeijing 100083China Exploration and Development Research Institute of Southwest oil&Gas Field Company PetroChinaChengduSichuan 610041China

The causes of the global mass extinction that occurred around the Permian-Triassic boundary have been widely studied through the geological record and in various *** results show that volcanic activity was a key factor in initiating the crisis during the Late *** to other thermal events triggered by volcanic activity,pyrolysis of petroleum in Pre-Permian reservoirs has rarely been suggested as a significant source of the greenhouse gases that caused the mass *** this study,geochemical analysis is carried out of a huge paleo-oil reservoir in the Yangtze Block(YB),South *** detection of mineral inclusions and pyrobitumens is evidence of rapid pyrolysis of accumulated oil in the Ediacaran *** evidence from hydrothermal minerals and the presence of domain mesophase in the pyrobitumen suggest that the pyrolysis process occurred abruptly and that greenhouse gases were rapidly released through venting *** dating of such a complex geological event in this old and deeply buried reservoir is inevitably difficult and potentially ***,cross-validation of the multiple evidence sources,including hydrothermal minerals and domain mesophase,indicates that the rapid oil pyrolysis must have been driven by a major thermal *** of burial and thermal histories suggests that the thermal event was most likely to have been triggered by the Emeishan Large Igneous Province(ELIP),which was in a period of significant volcanic activity during the Late *** volumes of gases,including methane,carbon dioxide,and possibly hydrogen sulfide,were released,causing a significant increase in greenhouse gases that may have contributed to global warming and the resulting mass extinction during the Late Permian Crisis(LPC).

关键词： oil reservoir pyrolysis Hydrothermal fluid Emeishan Large Igneous Province Gas release Mass extinction

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