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A New Evaluation Method of Shale Oil Sweet Spots in Chinese Lacustrine Basin and Its Application

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  • Xiaodong Li

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Ketong Chen

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Peng Li

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Junqian Li

    (School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
    Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao 266580, China)

  • Haiyan Geng

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Bin Li

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Xiwei Li

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Haiyan Wang

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Liyuan Zang

    (Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Yongbo Wei

    (School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
    Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao 266580, China)

  • Rixin Zhao

    (School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
    Shandong Provincial Key Laboratory of Deep Oil and Gas, Qingdao 266580, China)

Abstract

Compared with the marine shale from North America, Chinese lacustrine basins have more complex geological and reservoir conditions, which makes the selection of sweet spot intervals in the shale oil reservoir particularly difficult. It is thus crucial to accurately predict the shale oil sweet spots for effective exploration and development of shale oil in a lacustrine basin. In this paper, we propose an innovative evaluation method of shale oil sweet spots, which considers five primary parameters (i.e., total oil content, movable oil ratio, reservoir pressure coefficient, permeability, and rock brittleness index) to construct a comprehensive weighting factor, which is used to quantitatively identify a favorable shale oil reservoir. This method firstly constructs an evaluation function for each of the parameters, and then calculates a comprehensive weighting factor to determine the shale oil sweet spot. Statistical results show that the oil production of formation testing intervals have a good positive correlation with the average value of the comprehensive weighting factor of the intervals, which verifies the feasibility of the method. Based on this method, one of the key exploratory wells, Qiang21 in the Raoyang Sag of Bohai Bay basin, was selected as a case study and was determined to be a sweet spot interval of the shale oil reservoir in the upper third member of the Shahejie Formation. This study provides a new way to obtain a favorable exploration interval of shale oil reservoirs and serves shale oil development.

Suggested Citation

  • Xiaodong Li & Ketong Chen & Peng Li & Junqian Li & Haiyan Geng & Bin Li & Xiwei Li & Haiyan Wang & Liyuan Zang & Yongbo Wei & Rixin Zhao, 2021. "A New Evaluation Method of Shale Oil Sweet Spots in Chinese Lacustrine Basin and Its Application," Energies, MDPI, vol. 14(17), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5519-:d:628796
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    References listed on IDEAS

    as
    1. Tunstall, Thomas, 2015. "Iterative Bass Model forecasts for unconventional oil production in the Eagle Ford Shale," Energy, Elsevier, vol. 93(P1), pages 580-588.
    2. Kerstin Falk & Benoit Coasne & Roland Pellenq & Franz-Josef Ulm & Lydéric Bocquet, 2015. "Subcontinuum mass transport of condensed hydrocarbons in nanoporous media," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
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    Cited by:

    1. Zhiqi Guo & Wenxuan Gao & Cai Liu, 2023. "Geophysical Interpretation of Horizontal Fractures in Shale Oil Reservoirs Using Rock Physical and Seismic Methods," Energies, MDPI, vol. 16(22), pages 1-19, November.
    2. Zhaojing Song & Dianshi Xiao & Yongbo Wei & Rixin Zhao & Xiaocheng Wang & Jiafan Tang, 2023. "The Research on Complex Lithology Identification Based on Well Logs: A Case Study of Lower 1st Member of the Shahejie Formation in Raoyang Sag," Energies, MDPI, vol. 16(4), pages 1-19, February.

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