Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 72-84.doi: 10.12108/yxyqc.20190408

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Elemental geochemical characteristics and main controlling factors of organic matter enrichment of Longmaxi Formation in southern Sichuan

GAO Qiao1,2, WANG Xingzhi1,2, ZHU Yiqing1,2, ZHAO Shengxian3,4, ZHANG Rui3, XIAO Zheyu5   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
    4. Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan Province, Chengdu 610051, China;
    5. Third Institute of Oceanography, State Oceanic Administration, Xiamen 361000, Fujian, China
  • Received:2018-12-04 Revised:2019-03-04 Online:2019-07-21 Published:2019-06-21

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Abstract: In order to clarify the paleoredox conditions and the main controlling factors of organic matter enrichment of Longmaxi Formation in Weiyuan-Changing areas,southern Sichuan,the analysis of major and trace elements in four coring wells was carried out. The results show that:(1)Long 11 sub-member of Longmaxi Formation is rich in elements of V,Ni,Ba,Th and U with the loss of Cr element,while the Long 12 sub-member is rich in elements of V,Ba,Th and U with the loss of Cr and Co elements.(2)In the early sedimentary stage of Long 11 sub-member,the study area was in anoxic environment,and in the middle and late sedimentary stages, the redox condition evolved into dysoxic or oxic in Weiyuan area,while the environment evolved into oxic in Changning area.(3)In the sedimentary stage of Long 12 sub-member,WD204 H well area was steadily in oxic condition and WD201 well area was still in dysoxic or partially oxic condition in Weiyuan area,while the condition was entirely oxic in Changning area.(4)The enrichment of organic matter was mainly controlled by paleoredox condition in Long 11 sub-member,while it was controlled by the strength of paleoproductivity in Long 12 sub-member. The research results have important reference value for shale gas exploration of Longmaxi Formation in southern Sichuan.

Key words: redox conditions, sedimentary environment, trace elements, organic matter enrichment, paleoproductivity, Longmaxi Formation, southern Sichuan

CLC Number: 

  • TE132.2
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