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| 4D geomechanical analysis of geological bodies in abnormally high pressure exhausted gas storage：A case study of Southwest X gas storage |
| YANG Junwei1，JIA Shanpo1，2，FU Xiaofei2，3，XU Meng2，3，ZHANG Guangquan4，WANG Zhechao5，WU Guojun6 |
(1. Bohai-Rim Energy Research Institute，Northeast Petroleum University，Qinhuangdao，Hebei 066004，China；2. Key Laboratory of Oil and Gas Reservoir and Underground Gas Storage Integrity Evaluation of Heilongjiang Province，Northeast Petroleum University，Daqing，Heilongjiang 163318，China；3. CNPC Fault Controlling Reservoir Laboratory，Northeast Petroleum University，Daqing，Heilongjiang 163318，China；4. Sinopec Petroleum Exploration and Production Research Institute，
Beijing 100083，China；5. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines，Northeastern
University，Shenyang，Liaoning 110004，China；6. State Key Laboratory of Geomechanics and Geotechnical
Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract The pressure varies greatly in the depletion stage of abnormally high-pressured gas reservoir(AHGR)，and the peak pressure in the alternating injection-production stage cannot reach the original formation pressure after AHGR was reconstructed into underground gas storage(UGS)，which makes conventional methods not applicable to its geomechanical evaluation，thus leads to a lack of systematic evaluation method. In order to ensure the safe and efficient operation of UGS that reconstructed from AHGR，the X abnormally high pressure gas reservoir was selected as the study object，and both of its reservoir pressure field at the end of depletion and the stress and strain fields obtained from geomechanical numerical simulation were selected for data interactive transmission. Then，the dynamic coupling model of trap in-situ stresses and reservoir seepage is established. Finally，using the method of combining finite difference and finite element，the 4D geomechanical characteristics of trap geological body were evaluated systematically and accurately by regard the trap of UGS as the basic evaluation unit. In the end，the 4D geomechanical evaluation method，which can provide effective support for the evaluation of the UGS reconstructed from AHGR，is established.
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2023, Vol. 42 
