Critical pressure and multiphase flow in Blake Ridge gas hydrates
Critical pressure and multiphase flow in Blake Ridge gas hydrates
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DOI：
10.1130/g19863.1
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发表时间：
2003-12-01
期刊：
影响因子：
5.8
通讯作者：
Winters, WJ
中科院分区：
文献类型：
--
作者：
Flemings, PB;Liu, XL;Winters, WJ
我们使用岩心孔隙度、固结实验、压力岩心取样器数据和毛细管压力测量来预测北卡罗来纳州近海Blake Ridge海洋钻探计划站点997处甲烷水合物层下的水压力为岩石静应力的70%，以及气体压力等于岩石静应力。一个29米厚的相互连接的游离气柱被困在低渗透水合物层之下。我们认为，止岩气体压力是扩张裂缝，天然气是通过甲烷水合物层运移。甲烷水合物储藏中的超压气体和水限制了捕获的游离气的数量，并可能迅速将甲烷输出到海底。
We use core porosity, consolidation experiments, pressure core sampler data, and capillary pressure measurements to predict water pressures that are 70% of the lithostatic stress, and gas pressures that equal the lithostatic stress beneath the methane hydrate layer at Ocean Drilling Program Site 997, Blake Ridge, offshore North Carolina. A 29-m-thick interconnected free-gas column is trapped beneath the low-permeability hydrate layer. We propose that lithostatic gas pressure is dilating fractures and gas is migrating through the methane hydrate layer. Overpressured gas and water within methane hydrate reservoirs limit the amount of free gas trapped and may rapidly export methane to the seafloor.