Comparative analysis of the consolidation and shear behaviors of CH4 and CO2 hydrate-bearing silty sediments
Comparative analysis of the consolidation and shear behaviors of CH4 and CO2 hydrate-bearing silty sediments
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DOI：
10.1016/j.jngse.2020.103157
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发表时间：
2020-03
影响因子：
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通讯作者：
Tingting Luo;Yanghui Li;B. N. Madhusudhan;Jiafei Zhao;Yongchen Song
中科院分区：
文献类型：
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作者：
Tingting Luo;Yanghui Li;B. N. Madhusudhan;Jiafei Zhao;Yongchen Song
阿拉斯加北坡Ignik Sikumi的成功试采表明，CH 4-CO2置换法在天然水合物开采中具有巨大的应用潜力。含CH 4和CO2水合物沉积物力学行为的对比是评价CH 4-CO2置换前后水合物储层地质力学稳定性的关键因素。在粉砂质储层中发现了大量的水合物。然而，目前对含CH 4和CO2水合物粉质沉积物力学行为的研究还很少。本文对含甲烷和二氧化碳水合物粉质沉积物的各向同性固结特性和应力-应变关系进行了对比分析。结果表明，含CH 4和CO2水合物的粉质沉积物具有相似的压缩和膨胀指数。不同的水合物饱和度对含CH 4和CO2水合物粉质沉积物的强度和刚度有不同的影响。此外，含CO2水合物的粉质沉积物表现出比含CH 4水合物的粉质沉积物弱的收缩行为。
The successful production trial in Ignik Sikumi located in Alaska North Slope showed the significant potential of applying the CH4–CO2replacement method to natural hydrate production. The comparison on the mechanical behaviors of CH4and CO2hydrate-bearing sediments is the key factor in assessing the geomechanical stability of hydrate reservoirs before and after the CH4–CO2replacement. Large amount of hydrates have been discovered in silty reservoirs. However, studies focusing on the mechanical behaviors of CH4and CO2hydrate-bearing silty sediments are rare to date. This paper reports the results of a comparative analysis of the mechanical behaviors, including the isotropic consolidation behaviors and stress-strain relationships of CH4and CO2hydrate-bearing silty sediments. The results show that the CH4and CO2hydrate-bearing silty sediments present similar compression and swelling indexes. Various hydrate saturation shows differential effects on the strength and stiffness of CH4and CO2hydrate-bearing silty sediments. In addition, CO2hydrate-bearing silty sediments displays weaker contraction behaviors than that of CH4hydrate-bearing silty sediments.