贵州合层开发煤层气井产层孔渗特征研究  

Study on the production layer porosity and permeability characteristics of coalbed methane wells in the multi-coal seam development in Guizhou

作　　者：周培明 汪俊 魏元龙 向刚 徐虎 ZHOU Peiming;WANG Jun;WEI Yuanlong;XIANG Gang;XU Hu(Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas,Ministry of Natural Resources,Guiyang 550009,China;Guizhou Engineering Research Institute of Oil&Gas Exploration and Development,Guiyang 550009,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China)

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550009 [2]贵州省油气勘查开发工程研究院,贵州贵阳550009 [3]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《能源研究与信息》2023年第2期124-127,135,共5页Energy Research and Information

基　　金：贵州省地质勘查基金项目(208-9912-JBN-UTS0,52000021MGQSE7S7K6PRP)。

摘　　要：贵州省煤层发育,煤层气资源富集,对其合层开发煤层气产层孔渗特征进行研究能够为煤层气高产、稳产提供依据。基于贵州合层排采煤层气井产层特征统计,综合现有地质及工程数据,系统研究产层孔渗特征。研究结果表明:贵州境内受煤变质程度高的影响,煤层气产层孔隙度较低,主要在2%~6%之间;煤储层大多发育两组相互近正交的内生裂隙,外生裂隙则与区内深大断裂活动以及煤层厚度有关;产层渗透率均低于0.35 mD,属于中低渗透率产层,且以小于0.1 mD的低渗产层为主。In Guizhou Province,coal seams developed,which concentrated the coalbed methane.The production layer porosity and permeability characteristics of coalbed methane wells in the multi-seam development were studied to provide a basis for high yield and stable production of coalbed methane.Combining the statistics on the production layer characteristics of coalbed methane wells and the existing geological and engineering data in Guizhou,systematic study on the porosity and permeability characteristics of the production layers was performed.Results show that in Guizhou,the low porosity of 2%to 6%in the coalbed methane production layers is dominated by the high degree of coal metamorphism.Two groups of near-orthogonal endogenous fissures develop in most of coal reservoirs,while the exogenous fissures are related with both the deep fracture activity and coal thickness in the area.The production layers with the permeability less than 0.35 mD belong to medium and low permeability production layer and are dominated by the low permeability of less than 0.1 mD.

关 键 词：贵州 煤层气 煤层气井 孔渗特征 

分 类 号：P631.8[天文地球—地质矿产勘探]