深层页岩高温高压纳米孔中甲烷赋存与流动特性  

Occurrence and Flow Characteristics of Methane in High-Temperature and High-Pressure Nanopores of Deep Shale

作　　者：王睿 孙成珍[1] 杨旭 WANG Rui;SUN Chengzhen;YANG Xu(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Petroleum Engineering School Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西安交通大学,动力工程多相流国家重点实验室,西安710049 [2]西南石油大学石油与天然气工程学院,成都610500

出　　处：《工程热物理学报》2025年第4期1200-1204,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金优秀青年科学基金(No.52222606)。

摘　　要：针对深层页岩纳米孔隙中气体输运性质认识不清问题,进行了深层页岩高温高压储层条件下伊利石狭缝中甲烷赋存与流动特性的分子模拟研究,分析了甲烷分子的赋存与扩散性质及流动特性,讨论了温度、压力对甲烷赋存及流动规律的影响。结果表明:伊利石狭缝中甲烷密度非均质分布,壁面附近存在密度峰值;相较于中浅层页岩,深层页岩储层条件下孔隙内可以赋存更多的甲烷分子,扩散能力受到限制;甲烷流量随孔隙压力(5∼80 MPa范围)的降低而减小,随温度(60∼120℃范围)的降低而升高;压力是流量的主控因素,在降压开采时流量会逐渐减小。The understanding of gas transport in deep shale nanopores is still not clear.In this study,molecular simulations of methane occurrence and flow in illite slits of deep shales under the condition of high-temperature and high-pressure was carried out.The occurrence,diffusion and flow characteristics of methane molecules were analyzed.The effects of temperature and pressure on methane occurrence and flow were elucidated.The results show that the distribution of methane density in illite slits is nonuniform,and there are density peaks near the wall.Compared with Middle and Shallow shales,more methane molecules can exist in the pores of deep shale,and the diffusion ability is limited.The methane flow flux decreases with the decrease of pressure(5∼80 MPa)and increases with the decrease of temperature(60∼120℃).Pressure is the main dominating factor of flow flux,and the flow flux decreases gradually during depressurization.

关 键 词：深层页岩 流动扩散 伊利石 纳米孔道 分子模拟 

分 类 号：TE311[石油与天然气工程—油气田开发工程]