Organic matter enrichment law of lacustrine shale constrained by high resolution cyclostratigraphy: a case study from the lower sub-member of Member 3 of Paleogene Shahejie Formation,Dongying sag
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing), Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China
Abstract：The precise prediction of organic matter,which is closely related to palaeoclimate and palaeoenvironment,is the core and difficulty of petroleum geology research. In this study,cyclic stratigraphy and geochemical techniques were used to identify the high-frequency cyclic strata and analyze the palaeoenvironment,palaeoclimate,organic matter geochemistry and mineralogy of the lower sub-member of Member 3 of Shahejie Formation($Es_{3}^{L}$)in Well FY1,Dongying sag. The results show that: (1)Two 1.2 Ma long-term obliquity cycles,five 400 ka long eccentricity cycles,21 short eccentricity cycles of 96 ka,42 obliquity cycles of 51 ka and 103 precession cycles of 19 ka are identified in the $Es_{3}^{L}$ of the Paleogene in Dongying sag. Combined with the previous research results,based on the waveform curves of 1.2 Ma,400 ka and 96 ka,two long-term,six medium-term and 21 short-term base-level cycles were identified. (2)The correlation between the depositional environment of $Es_{3}^{L}$ and TOC data indicates a synchronization between palaeoclimate evolution and organic matter enrichment,which are controlled by the astronomical cycle. During the long obliquity or long eccentricity increased period,the climate become warmer and result in a raised base-level,enhanced reduced environment and favorable environment for organic matter accumulation. (3)The degree of organic matter enrichment depends mainly on the palaeo-productivity controlled by the wet climate and preservation condition controlled by paleo-lake depth. The long-term and medium-term scale cycle has a dominated control on organic matter enrichment. Therefore,the waveform curve of the long-term and medium-term scale cycle can be used to reconstruct the palaeoenvironment and locate the rich organic matter layer.
ZHOU Jinghao,XIAN Benzhong,ZHANG Jianguo et al. Organic matter enrichment law of lacustrine shale constrained by high resolution cyclostratigraphy: a case study from the lower sub-member of Member 3 of Paleogene Shahejie Formation,Dongying sag[J]. JOPC, 2022, 24(4): 759-770.
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