地下深层岩石微纳米孔隙内气体渗流的多尺度模拟与分析
Multiscale Simulation and Analysis for Gas Flow in Deep-Seated Micronano Pore

页岩气是未来中国能源结构中的重要组成部分，但中国页岩气埋藏深度大，不能直接照搬美国对浅层页岩气的开采经验，需要对其输运机理有更清晰的认识.介绍了跨尺度混合模拟算法，分析了基于孔隙尺度模拟来研究场尺度的气井衰减曲线分析等问题，揭示了高努森数效应与非理想气体效应之间的耦合机理；介绍了考虑多孔介质弹性形变对渗流影响时计算表观渗透率的特征压力模型，为页岩气勘探开发提供了相关理论支持.
Shale gas will become an important energy source in China in the near future. However, most shale gas in China is deeply buried, so the experience of shallowseated shale gas exploitation in US can not be directly employed. A better understanding of shale gas transport mechanism can surely facilitate the precise prediction of production and the exploitation optimization of deep-seated shale gas. In this paper, we establish a multiscale simulation method named pore-field iteration. Fieldscale problems such as inflow performance relationship and decline curve analysis are solved based on pore-scale simulation directly. In addition, the coupling between the high Knudsen number effect in micro flow and the nonideal gas effect caused by the high pressure and temperature underground is investigated from a theoretical perspective. Finally, we incorporate the influence of the elastic structural deformation in our modeling and propose the characteristic pressure model to calculate apparent permeability, which supports shale gas exploitation by providing theoretical analysis