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Assessment of the CO 2 Geological Storage Potential of Yanchang Shale Gas Formation (Chang7 Member) Considering the Capillary Sealing Capability of Caprock

Author

Listed:
  • Xiao Sun

    (Research Institute of Yanchang Petroleum (Group) Co., Ltd., Xi’an 710075, China)

  • Qi Cheng

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China)

  • Jiren Tang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China)

  • Xing Guo

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China)

  • Yunzhong Jia

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China)

  • Jingfu Mu

    (Research Institute of Yanchang Petroleum (Group) Co., Ltd., Xi’an 710075, China)

  • Guilin Zhao

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China)

  • Yalu Liu

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China)

Abstract

Reducing net carbon emissions is of great significance for sustainability. Carbon capture, utilization, and storage (CCUS) technology is regarded as one of the most effective approaches to reducing net carbon emissions. A prerequisite for the implementation of the CO 2 geological storage project is the assessment of the storage potential of the storage site. In this study, a calculation method of storage potential was proposed to estimate the CO 2 storage potential of the Yanchang shale gas reservoir in the Ordos Basin, China. In this method, the CO 2 sealing capability of the caprock is taken into account, which determines the maximum CO 2 storage pressure of the reservoir. The overall CO 2 storage potential consists of four types of storage states (free-state, adsorption, dissolution, and mineralization). The maximum CO 2 storage pressure of the Yanchang shale gas reservoir is 13.4 MPa via breakthrough pressure experiments, and the corresponding theoretical storage potential is 7.59 × 10 11 t. The potential for free-state, adsorption, dissolution, and mineralization sequestration are 8.42 × 10 10 t, 6.88 × 10 10 t, 2.45 × 10 9 t, and 6.05 × 10 11 t, respectively. Due to the difficulty in completing mineralization within the engineering time scale, the mineralization potential should not be taken into account when estimating the available CO 2 storage potential. The available CO 2 potential (including free-state, adsorption, and dissolution) of the Yanchang shale gas reservoir is 1.54 × 10 11 t, which is a considerable amount. The Yanchang shale gas formation will be able to accommodate 41.49% of global annual CO 2 emissions (according to the data in 2021) if the available CO 2 storage potential of the Yanchang shale gas reservoir is fully exploited.

Suggested Citation

  • Xiao Sun & Qi Cheng & Jiren Tang & Xing Guo & Yunzhong Jia & Jingfu Mu & Guilin Zhao & Yalu Liu, 2023. "Assessment of the CO 2 Geological Storage Potential of Yanchang Shale Gas Formation (Chang7 Member) Considering the Capillary Sealing Capability of Caprock," Sustainability, MDPI, vol. 15(20), pages 1-15, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:20:p:15038-:d:1262732
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    References listed on IDEAS

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