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Development patterns of source rocks in depression lake basin and its controlling effect on oil accumulation：Case study of the Chang 7 shale of the Triassic Yanchang Formation，Ordos Basin

Cui Jing-wei，Zhu Ru-kai，Li  Sen，Qi Ya-lin，Shi Xiao-zhang，Mao Zhi-guo   

  1. 1.Research Institute of Petroleum Exploration and Development，PetroChina，Beijing 100083，China；
    2.Key Laboratory of Petroleum Reservoir，CNPC，Beijing 100083，China；
    3.Research Institute of Petroleum Exploration and Development，Changqing Oilfield Company，CNPC，Xi’an 710018，China；
    4.Research Institute，Yanchang Petroleum Group Co.Ltd.，Xi’an 710075，China
  • Received:2019-01-30 Revised:2019-03-13 Online:2019-07-10
  • About author:Cui Jingwei(1980-), Male, Senior engineer, Ph.D, Mainly engaged in unconventional oil and gas geology and reservoir-forming geochemistry research. E-mail：cuijingwei@petrochina.com.cn.
  • Supported by:

    Supported by the China National Science and Technology Major Project (Grant No.ZX201705001-01-004); the National Basic Research Program of China (973 Program) (Grant No.2014CB239000).

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Abstract: In the Mesozoic T-J1 oil system of Ordos Basin，the degree of oil enrichment，main production layer and source rock distribution have strong regional differences，and there is no systematic study on this difference.The total organic carbon abundance and vertical distribution of the Chang 7 oil formation source layers of 8 long core wells in different areas of the basin were calculated by means of ΔLogR method.According to the industrial oil well and the low production well，the favorable oil distribution areas of Chang 8，Chang 7 and Chang 6 oil formation reservoirs are demarcated.The study found that there are five distribution styles and strong regional differences in the longitudinal direction of source rocks.The Jiyuan area in the northwestern part of the lake basin is dominated by the bottom rich type and the full section rich type.The northeastern Shaanxi region is mainly dominated by the middle rich type and the top rich type.The central area of the basin is mainly the interlayered type，and the southwestern Longdong region is mainly the bottom rich type.The comprehensive analysis of source rock type and oil favorable zone reveals that source rock type has a controlling effect on crude oil distribution.Bottom rich type and the full section rich type are dominant in the Jiyuan area，and multiple layers have oil.In northern Shaanxi，the top rich type and middle rich type accumulate to the upper，and the Chang 6 oil formation was the main production layer.The bottom rich type of the Longdong area accumulates under the source，and the Chang 8 oil formation is the main production layer.The central part of the lake basin is dominated by the interlayered type with multiple layers of production oil.The relationship between the distribution pattern of source rock and oil accumulation is not only an improvement of the distribution law of the continental lake，but also has important significance for the optimization of the field of near-source-in-source oil and gas exploration.

Key words: Ordos Basin, Yanchang Formation, Patterns of source rocks, Exploration direction

CLC Number: 

  • TE122.2
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