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2007年5月,南海北部神狐海域的实地钻探结果表明该区域海底存在大量天然气水合物,其作为未来我国潜在的可开发能源的调查和资源评价工作正在展开.本文以SH7站位的钻探、测井数据为基础,建立了实际水合物藏分层地质模型,主要包括上盖层、水合物层和下盖层,其中上下盖层均为可渗透的沉积物.本文利用新型的开采井设计方式,进行了单一水平井定压降压法开采水合物的数值模拟.结果表明,开采过程中水合物分解区域主要集中在开采井周边区域、水合物层与上下盖层的界面附近区域.开采井产气量远小于存在不可渗透盖层的水合物藏,利用单一降压法不能经济有效地开采该区域天然气水合物.
In May 2007, the field drilling in Shenhu sea area in the northern South China Sea showed that there was a large amount of gas hydrate in the seabed of the South China Sea, which is being investigated as a potential exploitable energy source and resource evaluation in China in the future.In this paper, Based on the well logging data, a stratigraphic model of the actual hydrate reservoir is established, which includes the upper cap layer, the hydrate layer and the lower cap layer, and the upper cap layer and the lower cap layer are all permeable sediments.In this paper, , The numerical simulation of hydrate production by single horizontal well with constant pressure and pressure was carried out.The results show that the hydrate decomposition area mainly concentrates in the area near the interface of the production well and the hydrate layer and the upper and lower cap rocks during the mining process. Well gas production is much smaller than hydrate reservoirs with impermeable capstones, and the use of a single depressurization method can not effectively and economically exploit gas hydrates in the region.