含油气盆地微渗漏甲烷运移机制研究进展

A Preliminary Review of Gas Migration Mechanisms of Methane Microseepage in Hydrocarbon-prone Areas

地质甲烷是仅次于湿地甲烷的第二大天然甲烷源,全球约10%的甲烷来自于地质甲烷释放。含油气盆地的甲烷是地质甲烷的重要组成部分,其渗漏主要分为点源微渗漏和面源微渗漏,影响甲烷微渗漏的关键在于CH_4等烃类气体渗漏过程的运移机制。综述了甲烷微渗漏过程中控制气体运移的基本因素和运移动力,重点介绍了甲烷微渗漏气体的主要运移方式,并以新疆塔里木盆地大宛齐油田的微渗漏甲烷通量监测为例,探讨了含油气盆地甲烷微渗漏的运移机制。

Geological methane is second only to wetland methane in source of natural methane. About 10% of the global methane comes from the release of geological methane. Methane in hydrocarbon-prone areas is an important part of geological methane, and its seepage can be mainly divided into focused flow and diffuse flow. The key to influencing methane seepage is the migration mechanism of CH4 and other hydrocarbon gas seepage process. This paper summarizes the fundamentals and driving forces for gas migration in the process of methane microseepage, and highlights the main forms of gas migration of microseepage. By detecting the microseepage methane flux of Dawanqi oilfield in Tarim basin, Xinjiang, China, the migration mechanism of microseepage in hydrocarbon-prone basins is discussed.