IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v15y2022i12p4270-d835832.html
   My bibliography  Save this article

Oil Retention and Its Main Controlling Factors in Lacustrine Shales from the Dongying Sag, Bohai Bay Basin, Eastern China

Author

Listed:
  • Peng Cheng

    (State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China)

  • Xianming Xiao

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China)

  • Qizhang Fan

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China)

  • Ping Gao

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China)

Abstract

The investigation of the shale oil development potential of the lower third section–upper fourth section (ES 3 3 –ES 4 1 ) of the Eocene–Oligocene Shahejie Formation in the Dongying Sag, Bohai Bay Basin, eastern China, continues to be a scientific challenge. A total of 23 shale samples was collected from these strata, and the organic petrology, organic geochemistry, mineral composition, porosity, and pore structure of these samples and their relationships with the retained oils were investigated. The results indicated that these shales with type I–IIa kerogen are rich in lamalginite and its debris, and the Ro values of these shales range from 0.70% to 1.00%. The non-micropores (>2 nm) that are mainly developed from inorganic minerals are greater than the micropores (<2 nm) that largely contributed from the organic matter of the shale. The retained oil contents presented by the free hydrocarbons (S1) and extracted organic matter (EOM) exhibited significantly positive relationships with the total organic carbon (TOC) contents and micropore volumes, which may indicate that the retained oils are largely stored in organic matter micropores resulting from the volume swelling of kerogen. The total oils and their light compositions, as well as the S1/TOC and EOM/TOC values, increase with the burial depth of the shales, indicating that the content and mobility of the retained oils are largely controlled by the maturity of shales. This study predicts that the burial depth of favorable shale oil reservoirs in the Dongying Sag should be greater than 3500 m (Ro > 0.90%), and the siltstone or carbonate rock interlayer, especially with laminated or layered textures, will further control the sweet spot intervals of shale oil. This study provides new geological evidence for revealing the retention mechanism of shale oils and has practical significance for shale oil exploration and development in the Dongying Sag, Bohai Bay Basin.

Suggested Citation

  • Peng Cheng & Xianming Xiao & Qizhang Fan & Ping Gao, 2022. "Oil Retention and Its Main Controlling Factors in Lacustrine Shales from the Dongying Sag, Bohai Bay Basin, Eastern China," Energies, MDPI, vol. 15(12), pages 1-26, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4270-:d:835832
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/15/12/4270/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/15/12/4270/
    Download Restriction: no
    ---><---

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Weizhu Zeng & Zhiguang Song, 2022. "Influences of Clay Mineral and Organic Matter on Nanoscale Pore Structures of the Cretaceous Lacustrine Shales in the Songliao Basin, Northeast China," Energies, MDPI, vol. 15(19), pages 1-16, September.
    2. Hongqi Yuan & Lihua Zhao & Yaxiong Zhang & Yunong Wu & Yinghua Yu, 2023. "A Method for the Prediction of Favorable Sites on Faults That Adjust Outside-of-Source Hydrocarbon Accumulations to High-Slope Areas: A Case of the Zhaobei Fault in Qikou Sag, Bohai Bay Basin, Eastern," Energies, MDPI, vol. 16(17), pages 1-17, September.
    3. Qiyang Gou & Shang Xu, 2023. "The Controls of Laminae on Lacustrine Shale Oil Content in China: A Review from Generation, Retention, and Storage," Energies, MDPI, vol. 16(4), pages 1-17, February.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4270-:d:835832. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.