淮南煤田煤系页岩气储集空间特征及其岩相控制作用

发布时间：2018-03-20 03:28

本文选题：煤系页岩气　切入点：储集空间　出处：《吉林大学学报(地球科学版)》2017年02期 　论文类型：期刊论文

【摘要】：海陆过渡相煤系泥页岩广泛分布,具有良好的天然气资源潜力。以淮南煤田煤系泥页岩为研究对象,运用X射线衍射、扫描电镜等分析手段,对淮南煤田煤系地层泥页岩的矿物学、岩相、储层特征等方面进行相关测试,并探讨了泥岩岩相对页岩气储集空间的控制作用。研究表明:淮南煤田煤系泥页岩矿物成分中黏土矿物含量多、自生非黏土矿物相对较少,致使岩石脆性降低并对压裂裂缝产生具有负效应,但部分菱铁矿的存在可能起改善作用;存在花斑状高岭石泥岩、浅灰色高岭石泥岩、鲕状泥岩、暗色泥岩、粉砂质泥岩等5种岩相。泥页岩储层裂缝包括层面剪切缝、有机质演化异常压力缝、层间页理缝、构造裂缝等宏观类型和与石英和高岭石有关的微裂缝类型;泥页岩孔隙包括化石孔、粒间孔、粒内孔和晶间孔及可能的有机质孔等类型,为页岩气赋存提供了储集空间。不同沉积环境下的泥岩岩相不同,进而决定了矿物成分特征与有机质相对含量,对泥页岩储集空间起主要控制作用。
[Abstract]:Paralic coal shale is widely distributed and has good potential of natural gas resources in Huainan coalfield. Coal shale as the research object, using X ray diffraction, scanning electron microscopy, the mineralogy of Huainan coalfield, coal bearing strata of shale facies, reservoir characteristics and other aspects of the relevant test, and discusses the control effect the mudstone relative shale gas reservoir space. Results showed that the content of clay minerals in Huainan coalfield coal shale minerals, authigenic non clay minerals is relatively small, resulting in reduced rock brittleness and produce negative effects on fracture, but some siderite existence may improve; existing granophyric kaolinite mudstone, shallow the grey oolitic kaolinite mudstone, mudstone, mudstone, silty mudstone and other 5 kinds of lithofacies. Shale reservoir fracture level including shear fracture, organic evolution of abnormal pressure joints between layers Foliation joints, structural fractures and other macro types and associated with quartz and kaolinite micro fracture type shale pore; including fossil pore, intergranular pore, hole and other types of possible organic pore intragranular pore and intergranular, provides reservoir space for shale gas accumulation. Under different sedimentary environments of different mudstone facies. And then determine the relative content of mineral composition and characteristics of organic matter, the space has played an important role in shale reservoir.

【作者单位】：安徽理工大学地球与环境学院;安徽省煤田地质局;
【基金】：国家自然科学基金项目(41402140,41302129) 安徽省页岩气资源调查评价项目(2012-g-17) 安徽省自然科学基金项目(1408085QE88)~~
【分类号】：P618.13

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