织纳煤田张家湾区块煤储层特征与煤层气开发模式研究  

Coal reservoir characteristics and coalbed methane development modein Zhangjiawan block of Zhina coalfield

作　　者：郭志军 杨永宇 温书鹏 孔令飞[3] 黎建 刘伟[4] 张雄[4] Guo Zhijun;Yang Yongyu;Wen Shupeng;Kong Lingfei;Li Jian;Liu Wei;Zhang Xiong(Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Region,Ministry of Natural Resources,Guiyang,Guizhou 550081;Guizhou Institute of Petroleum Exploration and Development Engineering,Guiyang,Guizhou 550081;113 Team of Guizhou Coal Geology Bureau,Guiyang,Guizhou 550025;College of Resources and Security,Chongqing University,Chongqing 400044)

机构地区：[1]自然资源部复杂构造区非常规天然气评价与开发重点实验室,贵州贵阳550081 [2]贵州省油气勘查开发工程研究院,贵州贵阳550081 [3]贵州省煤田地质局一一三队,贵州贵阳550025 [4]重庆大学资源与安全学院,重庆400044

出　　处：《资源环境与工程》2024年第4期414-420,共7页Resources Environment & Engineering

基　　金：贵州省地质勘查专项资金项目(52000021MGQSE7S7K6PRP,52000024P0048BH101732);贵州省科技计划项目(黔科合支撑[2023]一般369)。

摘　　要：贵州省织纳煤田煤炭资源丰富,煤层气资源开发潜力巨大。以织纳煤田三塘向斜张家湾区块为研究区,根据参数井取心资料,分析煤储层的煤体结构、含气性、孔渗特性及力学特性,探讨与之相适应的煤层气勘探开发模式。结果表明,张家湾区块发育薄—中厚复杂煤层群,具有10个可采煤层,可采煤层埋深200~500 m;各煤层为高阶煤储层,大多数煤层的煤体结构较好,煤层含气量为9.36~18.05 m^(3)/t(平均为14.14 m^(3)/t),呈随深度增加而增加的趋势,具备较好的煤层气开发潜力;煤层渗透性较低,特别是6、7煤层的渗透性极低,适用于压裂改造或间接增透模式开发;煤储层强度和脆性随深度增加呈现增加趋势。该区块首选开发模式为丛式井“分段压裂、合层排采”,对于厚煤层可考虑开展小规模水平井前瞻探索,对于煤炭开采区建议积极探索“煤—气”资源协同开发模式。研究成果可为张家湾区块煤层气勘探开发技术体系的建立提供有益参考。Zhina Coalfield in Guizhou Province is rich in coal resources,and the development potential of coalbed methane resources is huge.Taking Zhangjiawan block of Santang syncline in Zhina coalfield as the research area,according to the coring data of parameter wells,the coal structure,gas content,porosity and permeability characteristics and mechanical properties of coal reservoirs are analyzed,and the corresponding exploration and development mode of coalbed methane is discussed.It shows that this block is distributed in thin-medium thickness complex coal seams with 10 minable coal seams and buried depth of 200-500 m.As a high-order coal reservoir,the coal body structure of most coal seams is good,and the gas content of coal seams is 9.36 to 18.05 m^(3)/t,with an average of 14.14 m^(3)/t,which shows a trend of increasing with depth,and has good development potential of coalbed methane.The permeability of coal seam is low,especially the permeability of No.6 and No.7 coal seam is extremely low,which is suitable for fracturing reconstruction or indirect permeability enhancement mode development.The strength and brittleness of coal reservoir increase with depth.It is discussed that the preferred development mode in this area is cluster well“staged fracturing and combined layer drainage”.For thick coal seams,small-scale horizontal wells can be considered for forward exploration,while for coal mining areas,it is suggested to actively explore the coordinated development of“coal-gas”resources.The research results can provide a useful reference for the establishment of coalbed methane exploration and development technology system in Zhangjiawan block.

关 键 词：煤层气 煤储层 参数井 开发模式 织纳煤田 

分 类 号：P618.11[天文地球—矿床学] TQ517.5[天文地球—地质学]