Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 49-62.doi: 10.12108/yxyqc.20230105

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Geochemical characteristics and sedimentary environment of source rocks of the third member of Paleogene Shahejie Formation in central Laizhouwan Sag,Bohai Sea

DENG Meiling1,2, WANG Ning1,2, LI Xinqi3, CHEN Rongtao3, LIU Yan1,2, XU Yaohui1,2   

  1. 1. Hubei Key Laboratory of Petroleum Geochemistry and Environment (College of Resources and Environment, Yangtze University)， Wuhan 430100, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education (Yangtze University)， Wuhan 430100, China;
    3. Research Institute of Bohai Petroleum, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
  • Received:2022-05-16 Revised:2022-06-18 Online:2023-01-01 Published:2023-01-06

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Abstract: The geochemical characteristics and sedimentary environment of the third member of Paleogene Shahejie Formation (E2s3) in central Laizhouwan Sag of Bohai Sea were studied by means of pyrolysis，TOC，GC/MS analysis of saturated hydrocarbons，and major and trace elements analysis of source rock samples. The results show that: (1) The source rocks of E2s3 have different organic matter abundances，they are generally good to high-quality source rocks. The organic matters are mainly type Ⅰ-Ⅱ and in the low mature to mature stage as a whole. (2) According to Pr/nC17-Ph/nC18 plates，C24 tetracyclic terpanes/C26 tricyclic terpanes (C24 TeT/C26 TT)， C27/C29 regular sterane and olliane index，it can be concluded that the organic matters of E2s3 source rocks are derived from mixed inputs of lower aquatic organisms and terrigenous higher plants. (3) CIA，Sr/Ba，Pr/Ph，V (/V+Ni)， U/Th and gammacerane index were used to analyze the paleoenvironment of the source rocks. During the sedimentary period of E2s3，the climate was warm and humid with abundant precipitation. The water environment was fresh-brackish water，accompanied by strong terrigenous input，with high initial productivity，and the sedimentary environment is weak oxidation and weak reduction environment with poor oxygen. The sedimentary environment of E2s3 has little change，and the paleoclimate and water salinity are basically the same. However，terrigenous input and water oxidation conditions gradually increase with the deposition.

Key words: low mature to mature source rocks, geochemical characteristics, weak oxidation and reduction environment, terrigenous, the third member of Shahejie Formation, Paleogene, Laizhouwan Sag, Bohai Sea

CLC Number: 

  • TE122.114
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