鄂尔多斯盆地东缘临兴东区杨家坡区块煤层气井产能特征及主控因素  

Characteristics and Key Control Factors of Coalbed Methane Well Productivity in the Yangjiapo Block,Eastern Linxing District,Ordos Basin

作　　者：闫涛滔 邓志宇[2] 吴鹏[2] 高国森 常锁亮[1] 付鑫宇 孟艳军 刘彦飞 YAN Taotao;DENG Zhiyu;WU Peng;GAO Guosen;CHANG Suoliang;FU Xinyu;MENG Yanjun;LIU Yanfei(College of Mining Technology,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;China United Coalbed Methane Co.,LTD.,Beijing 100016,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]太原理工大学地球科学与测绘工程学院,山西太原030024 [2]中联煤层气有限责任公司,北京100016 [3]中国地质大学(北京)能源学院,北京100083

出　　处：《现代地质》2024年第6期1545-1556,共12页Geoscience

基　　金：国家自然科学基金项目(41902178);中联煤层气有限责任公司临兴东区块杨家坡区煤层气一体化研究项目(ZZGS SAYJPYTH2020-300);山西省重点研发计划项目(202102090301009);山西省基础研究计划青年项目(20210302123061)。

摘　　要：煤层气井产能特征及其主控因素分析是提高煤层气资源动用率和实现经济高效开发的重要保障。通过综合分析鄂尔多斯盆地东缘杨家坡区块地质资料和气井生产数据,对区域煤层气井产气特征、典型井排采动态变化规律和产能影响因素进行解剖。提出单位液面降幅产气量、液面降幅比等参数以提高气井产能评价的合理性和准确性,并结合灰色关联分析方法确定了杨家坡区块煤层气井产能主控因素。研究结果表明:杨家坡区块煤层气井产气量呈现非均质分布特征,稳产气量为552~1744 m^(3)/d。基于生产井产气特征,可将见气井排采阶段划分为低产气、产量上升和稳定产气3个阶段。煤层气井产能主控因素主要为地质因素,包括煤储层解吸特征和水文地质条件。提出了“高解吸指数—弱水动力”区域煤层气富集高产模式,该模式表明寻找高解吸指数伴有弱水动力条件下的产能潜力区是实现杨家坡区块煤层气产能高效建设的关键。相关认识及关键参数对本区乃至其他煤层气区块井位选择及资源高效开发有重要的指示和借鉴意义。Understanding the characteristics and primary controlling factors of coalbed methane(CBM)well productivity is key to improving utilization rate and achieving economic and efficient development of CBM resources.This paper examines the gas production characteristics,dynamic changes in typical well drainage,and factors affecting CBM well productivity,based on a comprehensive analysis of regional geology and gas well production data from the Yangjiapo block,Eastern Ordos Basin.New parameters,such as gas production per unit decrease in liquid level and the liquid level decrease ratio,were proposed to enhance the rationality and accuracy of evaluating gas well productivity.A grey correlation analysis was used to identify the primary factors controlling the productivity of CBM wells in the Yangjiapo Block.The study results indicate that gas production from CBM wells in the Yangjiapo Block is heterogeneous,with stable rate ranging from 552 to 1744 m^(3)/d.Based on gas production characteristics,the production can be divided into three stages:low production,production increase,and stable production.The primary controlling factors on the production capacity of the CBM wells are geological factors,including the desorption characteristics of coal reservoirs and hydrogeological conditions.A regional CBM enrichment and high-yield model has been proposed,characterized by a high desorption index and weak hydrodynamic conditions.This model suggests that areas with a high desorption index and weak hydrodynamic conditions are more likely to achieve efficient CBM production in the Yangjiapo Block.Understanding these key parameters provide important insights and reference for selecting well locations and efficiently developing resources in this area and potentially other CBM blocks.

关 键 词：煤层气 排采特征 产能影响因素 灰色关联分析 杨家坡区块 

分 类 号：P618.1[天文地球—矿床学]