深部煤层气储层微观结构及储渗机理

发布时间：2018-03-12 19:23

本文选题：煤层气储层　切入点：微观结构　出处：《辽宁工程技术大学学报(自然科学版)》2017年10期 　论文类型：期刊论文

【摘要】：采用扫描电镜观察了北京大安山煤矿和阜新五龙矿煤层气储层样本的微观结构,分析了煤层孔隙和裂隙的类型、大小、连通等结构特征及结构与煤层气储集和渗流间的关系,运用图像处理技术,基于扫描图片提取并分析了煤层孔隙度.结果表明:北京大安山煤矿煤层气储层样本是典型的低孔隙度、低渗透性储层,以微孔隙、极微孔隙、微裂隙、极微裂隙为主;阜新五龙矿煤层气储层样本是典型的高孔隙度、高渗透性储层,孔隙类型多样,存在大孔、大裂隙,孔隙之间和孔、裂隙间连通性好,十分利于煤层气的渗流和产出;煤层中孔隙较多、孔径适中的结构有利于煤层气的吸附储集,煤层中大孔和裂隙有利于煤层气的游离储集,煤层中裂隙延伸长而宽,孔隙间连通,孔、裂隙相沟通的结构有利于煤层气的渗流和运移.
[Abstract]:The microstructure of coalbed methane reservoir samples in Beijing Da'anshan Coal Mine and Fuxin Wulong Mine was observed by scanning electron microscope. The types, sizes and connections of pores and fractures in coal seam and their relationship with coalbed methane reservoir and percolation were analyzed. The coal seam porosity is extracted and analyzed based on scanning images by using image processing technology. The results show that the coal bed methane reservoir samples in Da'anshan Coal Mine in Beijing are typical low porosity and low permeability reservoirs, with micropores, very micro pores and micro fractures. The samples of coalbed methane reservoir in Wulong Mine of Fuxin are typical high porosity, high permeability reservoir, various pore types, large pores, large fractures, good connectivity between pores and pores, It is very favorable for the seepage and production of coalbed methane, the structure of pore size is favorable to the adsorption and storage of CBM, the large hole and fissure in coal seam is favorable to the free storage of CBM, and the crack in coal seam extends long and wide. The structure of communication between pores, pores and fissures is favorable to the seepage and migration of coalbed methane.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金(51574138,51574136,51304103)
【分类号】：P618.13;TE31

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