Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 51-65.doi: 10.12108/yxyqc.20230305

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Geochemical characteristics and formation environment of source rocks of Triassic Chang 7 member in northern Pingliang area，Ordos Basin

XUE Nan1,2, SHAO Xiaozhou1,2, ZHU Guangyou3, ZHANG Wenxuan4, QI Yalin1,2, ZHANG Xiaolei1,2, OUYANG Siqi5, WANG Shumin1,2   

  1. 1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    4. Department of Exploration, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    5. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2022-07-10 Revised:2022-08-20 Online:2023-05-01 Published:2023-04-25

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Abstract: Through geochemical analysis of dark mudstone samples of Triassic Chang 7 member from 15 wells in northern Pingliang area，southwest margin of Ordos Basin，combined with logging interpretation results，the paleosedimentary environment was inferred，and the main controlling factors and development model of hydrocarbon source rocks were summarized. The results show that： （1）The organic matter abundance of Triassic Chang 7 source rocks in northern Pingliang area gradually decreased from bottom to top， with the highest organic matter abundance in Chang 73 sub-member，followed by Chang 72 sub-member， and the lowest in Chang 71 submember. The organic carbon mass fraction of the hydrocarbon source rock of Chang 73 sub-member is up to 12.4%， with great hydrocarbon generation potential. The organic matters are mainly typeⅠand type Ⅱ1. It is a set of good to high-quality lacustrine source rocks in mature stage.（2）The climate was moist and warm during the sedimentary period of Chang 73 sub-member in northern Pingliang area， and it was a terrestrial freshwater environment. High paleo-productivity and anoxic reduction water created favorable conditions for the growth， reproduction and preservation of organic matters.（3）Volcanic-hydrothermal source rocks are developed in Chang 73 submember in northern Pingliang area. Volcanic activity and hydrothermal deposition jointly affect the water environment of Chang 73 sub-member. The high paleo-productivity is the basis for the formation of large amounts of organic matters， and the anoxic reduction environment is the key factor for the complete preservation of organic matters.

Key words: geochemistry, paleo-productivity, moist and warm, anoxic reduction environment, volcanic-hydrothermal source rocks, Chang 7 member, Triassic, northern Pingliang area, Ordos Basin

CLC Number: 

  • TE121.3
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