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为研究组合盖层中垂向贯穿断层对储层中CO2的密封效果,利用TOUGH2数值模拟软件模拟研究了存在贯穿断层时组合盖层和单一盖层对CO2密封效果的差异。结果表明,当存在贯穿断层时,组合盖层的密封效果弱于单一盖层,但组合盖层在压力积聚方面仍具有一定优势,盖层岩石更难致裂;存在贯穿断层时,注入压力越大,组合盖层比单一盖层的密封效果更差,而断层带的突破压力基本不影响组合盖层的密封效果。
In order to study the sealing effect of vertical through faults in the composite caprock on CO2 in reservoirs, the TOUGH2 numerical simulation software was used to simulate the CO2 sealing effect of composite caprocks and single caprocks in the presence of through-faults. The results show that the sealing effect of the composite cap layer is weaker than that of the single cap layer, while the composite cap layer still has some advantages in pressure buildup, and the cap rock is more difficult to crack. In the presence of the fault, the injection pressure The sealing effect of the composite cover is worse than that of the single cover, while the breakthrough pressure of the fault zone does not affect the sealing effect of the composite cover.