两淮煤田低渗煤层孔隙结构三维可视化表征及其连通性  

Three-dimensional Visualization of Pore Structure of Low Permeability Coal Seam in Lianghuai Coal Field and Its Connectivity

作　　者：王章飞 方辉煌 桑树勋[3] 郑春山 郭金冉 WANG Zhang-fei;FANG Hui-huang;SANG Shu-xun;ZHENG Chun-shan;GUO Jin-ran(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230000,China;Key Laboratory of Coal-based CO2 Capture and Geological Storage,Jiangsu Province/Low Carbon Energy Institute,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]安徽理工大学地球与环境学院,淮南232001 [2]合肥国家综合科学中心能源研究所,合肥230000 [3]中国矿业大学低碳能源研究院/江苏省煤基CO_(2)捕集与地质存储重点实验室,徐州221116

出　　处：《科学技术与工程》2024年第26期11195-11207,共13页Science Technology and Engineering

基　　金：安徽省高校自然科学研究项目(2023AH040154);安徽省自然科学基金(2308085Y30);安徽省重点研究与开发计划基础领域项目(2023z04020001);国家自然科学基金青年基金(42102217);安徽省高校协同创新项目(GXXT-2021-018)。

摘　　要：为研究煤层孔裂隙结构的连通性对煤层气赋存与运移的影响。以两淮地区矿区的煤样作为实验研究对象,对煤样进行三维可视化重构,构建了煤样的三维孔隙结构模型以及等价孔隙网络模型,利用多种算法并结合表征单元体对煤样的孔隙结构进行表征与分析,同时,从整体到局部的角度对孔隙结构进行分析,研究表明:两淮地区孤立孔隙中C形孔隙占据主导,连通孔隙中F形孔隙占据主导;刘庄与祁东煤样孔隙结构空间展布较任楼与潘一矿区的煤样要好,具有更好的连通性;粗类型喉道之间的搭配较其他类型喉道之间的搭配整体连通性要好。结果说明两淮地区的煤样,大体积连通孔隙在孔隙结构中占据主导地位。刘庄与祁东煤样较任楼与潘一煤样的连通性要好,且刘庄煤样的连通性最好,潘一煤样连通性最差。To study the influence of the connectivity of coal seam pore and fracture structure on the occurrence and migration of coalbed methane.Taking coal samples from mining areas in the Lianghuai as experimental research objects,the three-dimensional visual reconstruction of the coal sample was carried out,the three-dimensional pore structure model and the equivalent pore network model of the coal sample were constructed,and the pore structure of the coal sample was characterized and analyzed by using a variety of algorithms and combined with the characterization unit,and the pore structure was analyzed from the perspective of the whole to the local.The results show as follows.C-type pores dominated in isolated pores,while F-type pores dominated in connected pores.The spatial distribution of the pore structure of the coal samples in Liuzhuang and Qidong is better than that of the coal samples in Renlou and Panyi mining areas,and has better connectivity.The overall connectivity between coarse types of throats is better than that between other types of throats.The large volume of connected pores occupies a dominant position in the pore structure of the coal samples in the Lianghuai area.The connectivity between Liuzhuang and Qidong coal samples is better than that between Renlou and Panyi coal samples,and the connectivity of Liuzhuang coal samples is the best,and the connectivity of Panyi coal samples is the worst.

关 键 词：煤层气 孔隙结构 等价孔隙网络模型 计算机断层扫描(computed tomography CT) 三维可视化重构 两淮煤田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]