渤海湾盆地临清坳陷西北巨鹿区块非常规天然气储层特征  

A study on the characteristics of unconventional natural gas reservoirs in the Julu block of northwestern Linqing Depression,Bohai Bay Basin

作　　者：李史珂 刘景 朱炎铭[2] 马亚杰 刘鑫明 LI Shike;LIU Jing;ZHU Yanming;MA Yajie;LIU Xinming(School of Emergency Management and Safety Engineering,North China University of Science and Technology,Tangshan063200,China;Key Laboratory of Coal Methane Resource and Reservoir Formation Process of the Ministry of Education,China University of Mining and Technology,Xuzhou 221008,China)

机构地区：[1]华北理工大学应急管理与安全工程学院,河北唐山063200 [2]中国矿业大学,煤层气资源与成藏过程教育部重点实验室,江苏徐州1221008

出　　处：《天然气地球科学》2025年第2期221-239,共19页Natural Gas Geoscience

基　　金：国家自然科学基金青年项目“陆相页岩不同显微组分差异演化机制及其储层效应”(编号:42362022)资助。

摘　　要：非常规天然气储层特征研究对合理评估非常规天然气资源和指导非常规天然气开发具有重要意义。以渤海湾盆地临清坳陷巨鹿区块石炭系—二叠系煤系地层为研究对象,开展了扫描电镜、压汞、气体吸附、等温吸附等系列实验,系统性地表征了巨鹿区块煤层、页岩及致密砂岩的孔隙结构和含气性特征,分析并阐明了研究区的生烃潜力。结果表明:①巨鹿区块4层煤煤层总体呈NE—SW向展布,并由SE—NW向厚度呈增大—减小—增大的变化趋势。煤层整体含气量较低,由WN—ES向呈逐渐增加趋势。②页岩主要发育有机质孔、矿物粒间孔、矿物粒内孔和微裂缝4种。③页岩微孔和过渡孔发育,提供了大部分孔体积和孔比表面积,有利于气体的吸附储存。整体孔隙连通性较好,有利于页岩气的解吸与渗透。④致密砂岩砂体结构成熟度较低,多呈现磨圆差,属于典型的致密储层,砂体孔隙不发育,原生孔隙少,孔隙连通性较差等特征。该研究成果为巨鹿区块储层特征研究和评价煤系非常规天然气资源提供了地质依据。The study of the reservoir characteristics of unconventional natural gas formation is of great significance for the rational assessment of unconventional natural gas resources and the guidance of unconventional natural gas development.Taking the Carboniferous-Permian coal beds in Julu block of northwestern Linqing Depression,Bohai Bay Basin,as the research object,a series of experiments including scanning electron microscopy,mercury pressure,gas adsorption and isothermal adsorption were carried out to systematically characterize the pore structure and gas-bearing properties of the coal beds,shales and dense sandstones in Julu block,as well as to analyze and elucidate the hydrocarbon potentials of the research area.The results show that:(1)The four coal seams in Julu block are generally spreading in the NE-SW direction,and the thickness of the coal seams shows a trend of increasing-decreasing-increasing from SE to NW.The overall gas content of the coal seams is low,with a gradual increasing trend from NW to SE.(2)The shale mainly develops four kinds of organic matter pores,mineral intergranular pores,mineral intragranular pores and microcracks.(3)Shale micropores and transitional pores are developed,providing most of the pore volume and pore specific surface area,which is favorable for gas adsorption and storage.The overall pore connectivity is good,which is favorable for desorption and permeation of shale gas.(4)The dense sandstone sand body has low structural maturity,mostly showing poor grinding rounding,and is a typical dense reservoir,characterized by undeveloped pores in the sand body,few primary pores and poor pore connectivity.The research results provide a geological basis for the study of reservoir characteristics and evaluation of unconventional natural gas resources in coal beds in Julu block of northwestern Linqing Depression,Bohai Bay Basin.

关 键 词：煤层气 页岩气 致密砂岩气 储层特征 渤海湾盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]