Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 87-95.doi: 10.12108/yxyqc.20190110

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Paleoenvironment and controlling factors of organic matter enrichment: a case of Chang 7 oil reservoir in southern margin of Ordos Basin

LI Sen1, ZHU Rukai1,2,3, CUI Jingwei1,2,3, LIU Han1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. National Energy Center of Tight Oil and Gas, Beijing 100083, China;
    3. Key Laboratory of Oil and Gas Reservoir, CNPC, Beijing 100083, China
  • Received:2018-01-12 Revised:2018-05-09 Online:2019-01-18 Published:2019-01-18

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Abstract: The organic-rich shales of Chang 7 oil reservoir are widely developed in the southern margin of Ordos Basin,however,the mechanism of organic accumulation in the shales,sedimentary environment and controlling factors are controversial. High-density element scanning and organic geochemical analysis were carried out for Chang 7 member in well Yaoye 1 in Tongchuan area,to reconstruct the paleoenvironment of Chang 7 shales,revealing the controlling factors of organic-rich shale formation. It is found that the paleoproductivity decreased gradually from bottom to top,the water body was brackish and gradually desalinated during Chang 7 sedimentary period,and the water body changed from oxygen-rich to oxygen-poor and then to oxygen-rich. Pyrolysis and organic carbon measurements of organic-rich shales show that the organic matter types include Ⅱ1,Ⅱ2 and Ⅲ,and the abundance of organic matter is 0.44%-26.9%. The characteristics of organic matter in longitudinal direction are quite different. According to the of organic matter characteristics and paleoenvironment parameters of shales, the abundance of organic matter is mainly controlled by the reduction degree of water body,and the type of organic matter is related to paleoproductivity. Volcanic ash plays an active role in improving paleoproductivity.

Key words: sedimentary environment, organic matter enrichment, Chang 7 oil reservoir, Ordos Basin

CLC Number: 

  • TE121.3
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