Influence of mined-out areas on the replacement performance of marine gas hydrate CO2 replacement mining
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摘要: 为揭示固体开采形成的采空区对CO2置换开采天然气水合物置换效果的影响，开展了含采空区储层与完整储层的CO2/N2置换开采不同天然气水合物饱和度对比实验研究。结果表明：对于水合物饱和度分别为30%和45%的试样，含采空区储层较完整储层的CH4置换率分别提高了5.5%和9%，单位体积CO2封存量分别提高了26.5%和39.8%。采空区的存在提高了置换介质与天然气水合物的摩尔比率，从而提供了更高的置换驱动力；且在较高水合物饱和度试样中采空区还会提高置换介质的扩散作用，导致含采空区储层的置换效果好于完整储层。因此，在固体开采后进一步进行CO2置换开采，可以提高置换开采效率，同时有助于碳封存与地层稳定，是一种潜在的海域天然气水合物安全、绿色开采模式。Abstract: In order to reveal the influence of mined-out areas formed by solid mining on replacement performance of gas hydrate CO2 replacement mining， the comparative experimental study on CO2/N2 replacement mining of different gas hydrate saturations in mined-out area reservoirs and intact reservoirs was carried out. The results show that for the samples each with hydrate saturation of 30% and 45%， the CH4 replacement rate of the mined-out area-reservoir is 5.5% and 9% higher than that of the intact reservoir， and the CO2 storage per unit volume is increased by 26.5% and 39.8%， respectively. The existence of mined-out areas increases the molar ratio of the replacement medium to gas hydrate， thus providing a higher replacement driving force. Moreover， in the samples with high hydrate saturation， the mined-out area will also improve the diffusion of the replacement medium， resulting in the greater replacement effect of the reservoir containing mined-out area over the intact reservoir. Therefore， CO2 replacement mining after solid mining can improve replacement mining efficiency， and contribute to carbon sequestration and formation stability. It is a potential safe and green mining mode for marine hydrate.
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Key words:
- marine gas hydrate /
- mined-out area /
- CH4 replacement rate /
- CO2 storage
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