准噶尔盆地深部与浅部煤层气储层物性特征对比分析  

Comparative analysis of physical properties of deep and shallow CBM reservoirs in Junggar Basin

作　　者：邢丽茹 张洲[1,2,3] 任峻杉 余婉莹 王鹏翔 XING Liru;ZHANG Zhou;REN Junshan;YU Wanying;WANG Pengxiang(School of Resources and Environment,Henan Polytechnic University,Jiaozuo,Henan 454000,China;Henan Province Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Jiaozuo,Henan 454000,China;Henan International Joint Laboratory for Unconventional Energy Geology and Development,Jiaozuo,Henan 454000,China)

机构地区：[1]河南理工大学资源环境学院,河南省焦作市454000 [2]中原经济区煤层〈页岩〉气河南省协同创新中心,河南省焦作市454000 [3]河南省非常规能源地质与开发国际联合实验室,河南省焦作市454000

出　　处：《中国煤炭》2024年第9期9-17,共9页China Coal

基　　金：国家自然科学基金项目(42230814);河南省科技攻关项目(222102320140)。

摘　　要：为了探讨深部与浅部煤层气赋存的差异,采集准噶尔盆地煤矿1500 m以浅煤样和煤矿钻孔1500 m以深煤样,通过资料搜集和室内测试分析了研究区深部与浅部煤储层物性特征的差异,最终得到以下结论:深部镜质组含量比浅部高,煤体结构更完整,储层改造性更强;深部比浅部含气量大,煤层气赋存状态由欠饱和状态逐步转变为超饱和状态,煤层气成因多样;浅部煤岩的渗流孔比深部发育,深部煤岩的吸附孔比浅部发育。浅部煤岩以外生裂隙为主,孔裂隙间连通性好;深部煤岩以内生裂隙为主,有矿物质充填裂隙,且深部孔隙度和裂隙密度比浅部小,渗透性较差。对比分析表明,准噶尔盆地深部煤层气比浅部富集性更优,具有较大开发潜力。但渗透性远不如浅部,且开发难度大,因此建议通过压裂改造与排水采气工艺技术相结合的方式促进深部煤层气开发。In order to investigate the differences in deep and shallow CBM occurrence,coal samples were collected from boreholes at depths of over 1500 m and below 1500 m in the Junggar Basin coal mine.Through data collection and laboratory testing,the variations in physical properties of deep and shallow coal reservoirs in the research area were analyzed,leading to the following conclusions:vitrinite content of deep-buried coal was higher than that of shallow-buried coal,with a more intact coal structure and stronger reservoir modification;deep-buried coal had a higher gas content than the shallow-buried coal and the CBM occurrence state gradually changed from undersaturation to supersaturation,with diverse gas origins;the permeability pores of shallow-buried coal were more developed than those of deep-buried coal,while the adsorption pores in deep-buried coal were more developed than those in shallow coal rock.The shallow-buried coal rocks were primarily characterized by externally generated fractures with good connectivity between pore fractures,while deep-buried coal rocks were dominated by internally generated fractures with mineral-filled fractures,and deep porosity and fracture density were smaller than those in the shallow part,resulting in poorer permeability.Comparative results indicated that the deep part of the Junggar Basin had better CBM enrichment than the shallow part,with significant development potential.However,the permeability of deep CBM reservoir was much lower than that in the deep part,posing challenges to development.Therefore,it was recommended to promote deep CBM development through a combination method of fracturing transformation and drainage gas extraction technologies.

关 键 词：准噶尔盆地 深部煤层 浅部煤层 物性特征 煤层气开发 

分 类 号：P624.6[天文地球—地质矿产勘探]