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Geoscience Frontiers 2023年第5期14卷 91-107页

作者： Miruo Lin Kelai Xi Yingchang Cao Rukai Zhu Xiaobing Niu Honggang Xin Weijiao Ma Key Laboratory of Deep oil and Gas China University of Petroleum(East China)Qingdao 266580China Research Institute of Petroleum exploration and Development PetroChinaBeijing 100083China PetroChina Changqing oilfield Company Xi’an 700018China

The formation mechanism of micron-to centimeter-scale sedimentary cycles in lacustrine shales is a hot topic of research,because these small-scale sedimentary cycles significantly influence shale-oil distribution ***-frequency paleoenvironmental evolution is an important controlling factor for the formation of small-scale sedimentary ***,the driving factors of high-frequency paleoenvironmental evolution and the formation process of sedimentary cycles under its constraint remain *** this study,which focuses on lacustrine shales,we find that the alternating deposition of variable thickness of organic-rich lamina(ORL)and silty-grained felsic lamina(SSFL)form sedimentary cycles on the micron to centimeter scale in the Chang 73 sub-member of the Yanchang Formation in the Ordos *** on detailed petrographic characterization,in-situ geochemical parameter testing,and high-resolution cycle analysis,the formation process of cyclical sedimentary records and related paleoenvironmental evolution are *** solar activity cycles were identified from the shales,namely the 360–500 yr,81–110 yr,and 30–57 yr cycles(cycles I,II,and III,respectively).Highfrequency paleoenvironmental evolution caused by solar activity induced lake-level fluctuation,which further controlled silty-grained sediment deposition and organic matter preservation in deep lake *** I controlled relatively long-term lake-level fluctuation,driving several pairs of SSFL and ORL deposition at the centimeter *** II and III were short-term cycles and acted on the millimeter to micrometer scale,further complicating the sedimentary strata forming during the period of lake-level fall induced by cycle *** cyclic deposition of SSFL and ORL correspond to cycle ***-level fluctuation influenced by cycle II mainly caused SSFL thickness variation in each lamina *** the period of lake-level rise induced by cycle I,periods of lake level rise

关键词： Triassic Lacustrine shales Solar activity Lake-level fluctuation shale-oil exploration

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