Study on Geological Deformation of Supercritical CO 2 Sequestration in Oil Shale after In Situ Pyrolysis

Heping Yan (), Xiurong Wu, Qiang Li, Yinghui Fang and Shuo Zhang
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Heping Yan: Shaanxi 194 Coal Geological Co., Ltd., Tongchuan 727007, China
Xiurong Wu: Shaanxi 194 Coal Geological Co., Ltd., Tongchuan 727007, China
Qiang Li: College of Construction Engineering, Jilin University, Changchun 130026, China
Yinghui Fang: Shaanxi 194 Coal Geological Co., Ltd., Tongchuan 727007, China
Shuo Zhang: College of Construction Engineering, Jilin University, Changchun 130026, China

Energies, 2024, vol. 17, issue 15, 1-17

Abstract: After the completion of in situ pyrolysis, oil shale can be used as a natural place for CO 2 sequestration. However, the effects of chemical action and formation stress-state changes on the deformation of oil shale should be considered when CO 2 is injected into oil shale after pyrolysis. In this study, combined with statistical damage mechanics, a transverse isotropic model of oil shale with coupled damage mechanisms was established by considering the decreased mechanical properties and the chemical damage caused by CO 2 injection. The process of injecting supercritical CO 2 into oil shale after pyrolysis was simulated by COMSOL6.0. The volume distribution of CO 2 and the stress evolution in oil shale were analyzed. It is found that CO 2 injection into oil shale after pyrolysis will not produce new force damage, and the force damage caused by the decrease in the mechanical properties of oil shale after pyrolysis can offset the ground uplift caused by CO 2 injection to a certain extent. Under the combined action of chemical damage and mechanical damage, the uplift of a formation with a thickness of 200 m is only 10 cm. The injection of supercritical CO 2 is beneficial for maintaining the stability of oil shale after in situ pyrolysis.

Keywords: in situ pyrolysis of oil shale; CO 2 capture and storage; transverse isotropy; statistical damage mechanics; formation deformation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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