Experimental study on sediment deformation during methane hydrate decomposition in sandy and silty clay sediments with a novel experimental apparatus
Experimental study on sediment deformation during methane hydrate decomposition in sandy and silty clay sediments with a novel experimental apparatus
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砂质粉质粘土沉积物甲烷水合物分解过程中沉积物变形的实验研究
DOI：
10.1016/j.fue1.2016.05.112
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发表时间：
2016-10
期刊：
影响因子：
7.4
通讯作者：
Zhang Yu
中科院分区：
文献类型：
--
作者：
Han Han;Wang Yi;Li Xiao-Sen;Yu Jian-Xing;Feng Jing-Chun;Zhang Yu
从含水合物沉积物（HBS）中提取甲烷引起了全世界越来越多的兴趣。然而，天然气水合物的分解会引起严重的沉积物变形，是阻碍水合物开采的主要因素之一。为了研究甲烷水合物在不同沉积物中的分解行为，研究水合物分解过程中沉积物的变形，在新型三维快开高压反应器中进行了两次对比实验。本研究以南海神狐海域的合成砂质沉积物和天然粉质粘土沉积物作为HBS。对于砂质沉积物中的水合物，压力-温度（P-T）关系与块状水合物一致。而粉质粘土沉积物中水合物分解条件较砂质沉积物转移到更高的压力区，这主要是由于孔隙粒度小和盐度的存在。此外，由于盐度、有机物、矿物的影响以及孔隙和孔隙颗粒分布的不均匀，粉质粘土沉积物中水合物的分解条件在反应器的不同位置也有所不同。因此，认为粉质粘土沉积物中甲烷水合物沉积存在一个可变平衡。进一步观察了水合物分解的径向收缩效应（RASHEHD）。这可能是气体渗流和水合物胶结作用共同作用的结果。
Extraction of methane from hydrate-bearing sediment (HBS) has aroused increasing interest around the world. However, the decomposition of gas hydrate may cause significant sediment deformation, which is one of the main obstructions for the hydrate exploitation. To investigate the decomposition behaviors of methane hydrate in different sediments and study the sediment deformation during hydrate decomposition, two contrast experiments were carried out in a novel three-dimensional (3-D) high-pressure reactor with a quick-opening component. In this study, synthetic sandy sediment and natural silty clay sediment sampled from the Shenhu Area, South China Sea were used as the HBS. For hydrate in sandy sediment, the pressure-temperature (P-T) relationship is consistent with that of bulk hydrate. However, in silty clay sediment, the hydrate decomposition conditions shift into a higher pressure region than that in sandy sediment, which is mainly due to the small pore particle size and the presence of salinity. In addition, hydrate decomposition conditions in silty clay sediment also vary at different positions in the reactor because of the effects of salinity, organics, minerals and the uneven distribution of the pores and pore particles. Hence, it is considered that there is a variable equilibrium for the methane hydrate deposits in silty clay sediment. Further, Radial Shrinkage Effect of Hydrate Decomposition (RASHEHD) was observed in both experiments. It is possibly a combined consequence of gas seepage and the cementation effect of hydrate.
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