页岩中残余气赋存机理及脱气方法

Occurrence Mechanism and Degassing Method of Residual Gas in Shale

页岩气作为重要的非常规油气资源,在能源替代和环保领域的关注度和重要性日益凸显。页岩中残余气是页岩气的重要组成部分,其含量对于天然气储量预估及勘探核心区的指标评价具有重要意义,同时,相关理论研究也是油气成藏地质学的重要构成部分。通过对页岩中气体吸附与运移过程的解释说明,结合不同条件下含气性的变化规律,揭示了页岩残余气赋存机理及主要控制因素;介绍了几种页岩残余气脱气方法,从样品制备、试验体系等方面,对比分析了不同方法下的适用范围和研究内容。

As a kind of important unconventional oil-gas resources,shale gas has become more and more important in the fields of energy substitution and environmental protection.The scientific issues involved in the exploration and development of shale gas have also entered a new stage of exploration.The residual gas in shale is an important part of shale gas,and its contents are of great significance for the estimation of natural gas reserves and the evaluation of the core area of exploration.At the same time,relevant theoretical research is also an important part of hydrocarbon accumulation geology.In this paper,firstly,the existing forms and composition characteristics of shale residual gas are introduced,and the importance of shale gas research is elucidated.Through the explanation of gas adsorption and migration process in shale,combined with the gas-bearing,several shale residual gas degassing methods have been described.The application scope and research content of different methods have been compared respectively from the aspects of sample preparation and test system.