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Wettability of Tight Sandstone Reservoir and Its Impacts on the Oil Migration and Accumulation: A Case Study of Shahejie Formation in Dongying Depression, Bohai Bay Basin

Author

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  • Kunkun Jia

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Bejing 102249, China
    College of Geosciences, China University of Petroleum, Beijing 102249, China)

  • Jianhui Zeng

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Bejing 102249, China
    College of Geosciences, China University of Petroleum, Beijing 102249, China)

  • Xin Wang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Bejing 102249, China
    College of Geosciences, China University of Petroleum, Beijing 102249, China)

  • Bo Li

    (Exploration and Development Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China)

  • Xiangcheng Gao

    (Exploration and Development Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China)

  • Kangting Wang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Bejing 102249, China
    College of Geosciences, China University of Petroleum, Beijing 102249, China)

Abstract

The migration and accumulation of oil in tight sandstone reservoirs are mainly controlled by capillary force. Due to the small pore radius and complex pore structure of tight sandstone reservoirs, the capillary force is very sensitive to wettability, so wettability significantly affects oil migration and accumulation. However, the study of oil migration and accumulation in tight sandstone reservoirs often needs to combine multiple methods, the process is complex, and the research methods of wettability are not uniform, so the mechanism of wettability affecting oil migration and accumulation is not clear. Taking the tight sandstone of the Shahejie Formation in the Dongying sag, Bohai Bay Basin, as the research object, the wettability characteristics of a tight sandstone reservoir and their influence on oil migration and accumulation were analyzed by means of a pore permeability test, XRD analysis, micro-CT experiment, contact angle tests, spontaneous imbibition experiments, and physical simulation experiments on oil migration and accumulation. The results show that the reservoir is of the water-wet type, and its wettability is affected by the mineral composition. Wettability in turn affects the spontaneous imbibition characteristics by controlling the capillary force. Oil migration in tight sandstone reservoirs is characterized by non-Darcy flow, the oil is in the non-wetting phase and subject to capillary resistance. The key parameters to describe the oil migration and accumulation characteristics include the kickoff pressure gradient, the critical pressure gradient, and ultimate oil saturation. Wettability affects oil migration characteristics by controlling the capillary force. The more oil-wet the reservoir is, the more favourable it is to oil migration and oil accumulation and therefore the higher the reservoir’s ultimate oil saturation is.

Suggested Citation

  • Kunkun Jia & Jianhui Zeng & Xin Wang & Bo Li & Xiangcheng Gao & Kangting Wang, 2022. "Wettability of Tight Sandstone Reservoir and Its Impacts on the Oil Migration and Accumulation: A Case Study of Shahejie Formation in Dongying Depression, Bohai Bay Basin," Energies, MDPI, vol. 15(12), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4267-:d:835903
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    References listed on IDEAS

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    1. Juncheng Qiao & Xianzheng Zhao & Jianhui Zeng & Guomeng Han & Shu Jiang & Sen Feng & Xiao Feng, 2019. "The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs," Energies, MDPI, vol. 12(21), pages 1-24, October.
    2. Jianchao Cai & Lijun You & Xiangyun Hu & Jing Wang & Ronghua Peng, 2012. "Prediction Of Effective Permeability In Porous Media Based On Spontaneous Imbibition Effect," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 23(07), pages 1-12.
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