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

Xiao Sun, Qi Cheng, Jiren Tang (), Xing Guo, Yunzhong Jia, Jingfu Mu, Guilin Zhao and Yalu Liu
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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
Jiren Tang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Xing Guo: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Yunzhong Jia: State Key Laboratory of Coal Mine Disaster Dynamics and Control, 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
Yalu Liu: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Sustainability, 2023, vol. 15, issue 20, 1-15

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.

Keywords: CCUS; storage potential; shale gas formation; capillary sealing capability; caprock (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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