Numerical description of shale gas desorption stages

Abstract

The desorption of shale gas is dynamic and multistage processes. Dividing desorption process, describing the desorption stages, and analyzing the main factors in each stage are the research emphasis. The desorption process is described by mathematical models and divided into several stages according to desorption rate and its change rate. The results show that shale gas desorption can be divided into the slow desorption stage, the large desorption stage, and the final desorption stage. The increase of organic matter content not only has a significant effect on extending the production peak but also may lead to arrival of final desorption stage in advance. The increase of clay mineral content can accelerate the arrival of production peak and extend the production peak. It may be possible to analyze the shale gas production process and adjust the production plan on the basis of analyzing the material composition of reservoir.