Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 71-80.doi: 10.12108/yxyqc.20230507

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Pyrite morphology in shale of Permian Wujiaping Formation in eastern Sichuan Basin and its indicative significance to oceanic anoxic events

WEN Siyu1,2, ZHANG Bing1,2,3, YAO Yongjun4, MA Kai1,2, WANG Yan3, YANG Kai3   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. College of Geophysics, Chengdu University of Technology, Chengdu 610059, China;
    4. Chongqing Gas Mine, PetroChina Southwest Oil & Gas Field Company, Chongqing 400000, China
  • Received:2022-08-20 Revised:2022-10-25 Online:2023-09-01 Published:2023-09-28

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Abstract: Through microscopic thin section identification，X-ray diffraction analysis，major and trace elements test of shale samples from Permian Wujiaping Formation in eastern Sichuan Basin，the pyrite characteristics and anoxic events in shales of Permian Wujiaping Formation in eastern Sichuan Basin were studied. The results show that：（1）The shale mineral composition of Wujiaping Formation in eastern Sichuan Basin is relatively complex，rich in clay minerals，and pyrite is developed. The lithofacies are mainly divided into calcareous siliceous mixed shale，siliceous shale and clay shale.（2）The sensitive parameters of oxidation-reduction environment including U/Th，Ni/Co and V/Cr indicate that the sedimentary environment of Wujiaping Formation shale in the study area is generally suboxic environment，presenting the characteristics of transition from oxidation environment to anoxic environment from bottom to top vertically.（3）The grain size of framboidal pyrite in the study area is 5.18-10.75 μm，and it gradually decreases from bottom to top. This change in grain size can be regarded as its response to the Late Permian oceanic anoxic event.（4）The anoxic event caused by the eruption of the Emeishan basalt involves the late stage of Maokou Formation，and the stage of Wujiaping Formation and Dalong/Changxing Formation. Since the eruption of the Emeishan basalt，CO2 has been continuously dissolved in the water，plankton has increased greatly，and the oxygen content in the water has continued to decline. By the stage of Dalong/Changxing Formation， the water in eastern Sichuan Basin has been completely in an anoxic or even sulfide environment.

Key words: shale, pyrite morphology, ocean anoxia event, Wujiaping Formation, Permian, eastern Sichuan Basin

CLC Number: 

  • TE135
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