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天然气水合物是一种特殊的包合化合物。包合化合物乃是一种分子成分封闭在其它成分中的物理结合的分子。在天然气水合物中,气体分子以物理方式封闭在膨胀了的水分子晶格内。北冰洋水深335米以下和亚热带海洋水深610米以下的温度和压力均适于甲烷水合物的形成。洋底沉积中的天然气水合物层的理论底面深度是根据以下假设确定的:(1)稳定的静水压力梯度,(2)两种标准水温梯度;(3)变化的地温梯度;(4)纯甲烷气与共生海水发生水合作用。
Gas hydrate is a special inclusion compound. Inclusion compounds are physically bonded molecules whose molecular components are enclosed in other components. In gas hydrates, gas molecules are physically trapped in the lattice of swollen water molecules. Temperatures and pressures below 335 m in the Arctic Ocean and below 610 m in the subtropical ocean are suitable for methane hydrate formation. The theoretical bottom depth of the gas hydrate layer in the ocean floor sediment is determined based on the following assumptions: (1) steady hydrostatic pressure gradient, (2) two standard water temperature gradients, (3) varying geothermal gradient, (4) pure Methane gas and symbiotic seawater hydration.