今天翻译了这篇文章的摘要部分，请大家批评指正！题目：Methane migration within the submarine gas-hydratestability zone under deep-water conditions作者：G.D.  Ginsburg,  V.A.  Soloviev 
文章来源：Marine Geology 137  (1997) 49-57 
原文（全文见附件）：
Methane migration within the submarine gas-hydratestability zone under deep-water conditions
 
Abstract
Possible pathways of methane migration and associated gas-hydrate accumulationare considered. Gas-hydrates precipitate in water filtration routes when themethane concentration in water exceeds its solubility, which significantlydecreases within the hydrate stability zone towards the sea floor. In thevicinity of the ascending free gas flows, gas-hydrates are formed within adiffusion aureole resulting from the difference between chemical potentials of gaseousand water-dissolved methane. The role of diffusion is also essential in the vicinityof gas-saturated water flows as well as within and above the sections where biochemicalmethane is intensively generated.
 A chemical potential gradientof dissolved methane (which is a necessary condition for gas-hydrate accumulation)is created due to inhomogeneity of the geological medium manifested as temperatureand water salinity gradients or changes of permeability.
The thermobaric gas-hydrate stability zone is a geochemical barrier forhydrocarbon gas emigrating from sediments into the water column. However, methaneis not completely preserved in a hydrate state. It is unknown yet whichfraction of migrating methane is detained on this barrier.
翻译：
甲烷气体在深水区海底天然气水合物稳定带中的运移研究
摘要本文考虑了甲烷运移的可能通道以及与其相关的天然气水合物的生成。当甲烷气体在水中的富集度超过其在水中的溶解度，天然气水合物在水渗漏过程中析出。该气体溶解度具有从水合物稳定带向海底明显降低的趋势。在上升游离气流附近，天然气水合物以扩散环的方式分布，主要由于气态甲烷和水溶甲烷间化学势的区别引起的。相对于生物化学成因甲烷的集中产区内部和上部而言，扩散作用在具饱和气的水流附近同样重要。溶解甲烷气（具有形成水合物的条件）的化学势梯度的形成，归因于地质介质的非均质性，表现为温度和水的矿化度梯度随渗透性的变化而变化。特定的温压天然气水合物温度带是烃类气体从沉积物中运移到水体中的地球化学屏障。然而，甲烷气体不仅仅保存于一个水合物区带。目前还不清楚，从沉积物中运移出来的甲烷气体的哪一部分会停留在这个屏障区。
