Jin Xiaohui, Lin Qing, Fu Ning, Huang Xia, Zhu Youhai. Impact of CO2 on formation and distribution of gas hydrate in northern South China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2013, 35(6): 634-639. doi: 10.11781/sysydz201306634
Citation: Jin Xiaohui, Lin Qing, Fu Ning, Huang Xia, Zhu Youhai. Impact of CO2 on formation and distribution of gas hydrate in northern South China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2013, 35(6): 634-639. doi: 10.11781/sysydz201306634

Impact of CO2 on formation and distribution of gas hydrate in northern South China Sea

doi: 10.11781/sysydz201306634
  • Publish Date: 2013-11-28
  • In the northern South China Sea, non-hydrocarbon gases such as CO2 are abundant, which are both constructive and destructive for gas hydrates. When the natural gases containing CO2 leak upward to shallow formations, CO2 could be reduced to CH4 as carbon source under appropriate conditions, forming gas hydrates within shallow sediments. The experiments of gas samples with different CO2 and N2 contents have indicated that the temperature for gas hydrate formation of CO2-bearing gases is higher than that of CH4-bearing gases, resulting in deeper occurrence of hydrates and bigger thickness of hydrate stale zones. If strong seepage happened, natural gases with higher CO2 content would migrate upward to CH4 hydrate zone through deep faults. The replacement process of CH4 by CO2 will start. The previous gas hydrates will be damaged or the saturation of CH4 will decline.

     

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