豫东马桥详查区煤系气成藏地质特征  

Geological reservoir properties of coal measures gas in Maqiao survey area of eastern Henan province

作　　者：张小东[1,2] 朱春辉 林俊峰 许亚坤[3] 王昆 ZHANG Xiaodong;ZHU Chunhui;LIN Junfeng;XU Yakun;WANG Kun(School of energy science and engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;The Collaborative Innovation Center of Coalbed Methane（Shale Gas）of Central Plains Economic Zone,Jiaozuo 454000,Henan,China;No.4 Institute of Geological ＆ Mineral Resources Survey of Henan,Shangqiu 476000,Henan,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]中原经济区煤层气(页岩气)协同创新中心,河南焦作454000 [3]河南省地质矿产勘查开发局第四地质矿产调查院,河南商丘476000

出　　处：《河南理工大学学报（自然科学版）》2018年第5期40-46,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41372162);河南省高校"构造煤"科技创新团队支持计划项目(14IRTSTHN002)

摘　　要：为了探讨豫东煤系气生成、资源赋存规律和成藏可能,指导区内煤系气资源的勘探开发工作,以马桥详查区为研究对象,基于区域地质和储层地质条件,结合煤岩镜质体反射率、有机碳含量,以及孔渗性、吸附性等物性测试结果,剖析了煤系储层的空间分布及物性特征,探讨了煤系生烃潜力和成藏的可能性。结果表明:(1)区内煤系烃源岩为煤层和泥岩层,其中煤中镜质组含量高,变质程度深,生烃量大,为主要生气母质,而泥岩中有机质含量较低,生气能力有限。(2)煤体内微孔多,吸附能力强,加之砂、泥岩储层致密,孔隙度小,渗透率低,排驱压力较大,不利于气体的运移。(3)煤系经历了晚三叠世、晚侏罗世至早白垩世两期生烃高峰,期间煤层中气体压力较高,可以突破顶板泥岩的排驱压力运移至砂、泥岩层,但其富集成气藏的可能尚需要进一步研究。Abstract： In order to investigate the generation, resource endowment and potential possibility of coal measures gas（CMG） in the east coal basin of Henan province and thus to provide references for CMG exploration and development, the regional and reservoir geology of Maqiao survey area was analyzed. The spatial distribution and physical property characteristics of coal measure strata were determined based on the tests of vitrinite re- flectance, organic carbon content of coal samples as well as their physical properties （porosity, permeability and adsorption）. Meanwhile, the potential of hydrocarbon generation and possibility of gas accumulation were dis- cussed. The results show that, （ 1 ） the hydrocarbon source rocks of coal measure strata are coal and mudstone,and coal is the main hydrocarbon source rock with more vitrinites, deeper metamorphism and greater hydrocar- bon production,while mudstone is poor source rock with less hydrocarbon production for its lower organic mat- ters; （2） coal has high adsorption capacity on gas and more micropores in them, and the reservoirs including sand and mudstone seams are tight with poor porosity,low permeability and high displacement pressure, so that the properties are unfavorable to the migration of gas ; （3） the coal measure strata has experienced twice hydro- carbon generation peaks the late triassic and the late jurassic the early cretaceous, the gas with high pressure may have moved to the reservoirs such as different sand seams and mudstone seam,therefore,the further study on the possibility of gas reservoir forming is needed.

关 键 词：马桥详查区 煤系气 储层物性 埋藏史 热演化史 生烃史演化 成藏特征 

分 类 号：TE121[石油与天然气工程—油气勘探]