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Volume 42 Issue 4
Jul.  2020
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2020  >  42(4): 558-564
CAO Tingting, YAO Wei, LI Zhiming, LI Zheng, LI Maowen. Geochemical characteristics of lacustrine shale and enrichment mechanism of organic matter in Zhanhua Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(4): 558-564. doi: 10.11781/sysydz202004558
Citation: CAO Tingting, YAO Wei, LI Zhiming, LI Zheng, LI Maowen. Geochemical characteristics of lacustrine shale and enrichment mechanism of organic matter in Zhanhua Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(4): 558-564. doi: 10.11781/sysydz202004558
shu

Geochemical characteristics of lacustrine shale and enrichment mechanism of organic matter in Zhanhua Sag, Bohai Bay Basin

doi: 10.11781/sysydz202004558
  • 1.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • 2.

    State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China

  • 3.

    State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu 214126, China

  • 4.

    Key Laboratory of Hydrocarbon Accumulation Mechanism, SINOPEC, Wuxi, Jiangsu 214126, China

  • 5.

    Research Institute of Exploration and Development, SINOPEC Shengli Oilfield, Dongying, Shandong 257000, China

  • Received Date: 2020-01-06
  • Rev Recd Date: 2020-06-09
  • Publish Date: 2020-07-28
    Abstract
  • The lacustrine shale in the lower part of the third member of Shahejie Formation (Es3) in well L69 in the Zhanhua Sag of Bohai Bay Basin was studied. The geochemical characteristics of lacustrine shale in different system tracts were analyzed in a framework of sequence stratigraphy. The evolution process of sedimentary environment and the enrichment mechanism of organic matter were clarified, which provided theoretical support for the identification of favorable targets of unconventional shale oil. The combination of logging and lithology reveals that the sequence of the lower Es3 can be divided into transgression, early highstand and late highstand system tracts from bottom to top. Productivity and preservation conditions are the controlling factors of organic matter enrichment. The higher productivity and better preservation conditions together determine that the early highstand system tract is the most favorable organic matter accumulation interval, which provides a good material basis for a good shale oil development target.

     

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