煤系页岩气储层非均质性研究——以宁武盆地太原组和山西组为例

发布时间：2018-03-11 16:45

本文选题：煤系页岩气　切入点：储层非均质性　出处：《地质学报》2017年05期 　论文类型：期刊论文

【摘要】：储层非均质性是影响煤系页岩气勘探开发的主要瓶颈之一。以宁武盆地太原组和山西组泥页岩为研究对象,通过钻孔资料、TOC、XRD、扫描电镜、压汞及低温液氮测试,划分泥页岩发育层段,分析煤系页岩TOC、矿物成分、孔隙度、孔容、比表面积参数宏观非均质性及孔隙结构非均质性,探讨宏观—微观非均质性影响因素。研究表明:太原组和山西组泥页岩平均厚度分别为32.77m和67.68m,可划分为5个层段和4种暗色泥页岩类型,黑色页岩具有TOC、孔隙度、水敏性中等,脆性高特点,是最利于开发的优质储层段;微孔主要受黏土矿物含量影响,呈现出正相关关系,在黏土矿物含量较低时,微孔与TOC呈现正相关;煤系泥页岩宏观非均质性主要受沉积和构造影响,微观非均质性受成岩演化影响。研究成果可为优选煤系页岩气优质储层段和压裂工艺提供可靠依据。
[Abstract]:Reservoir heterogeneity is one of the main bottlenecks affecting the exploration and development of coal series shale gas. Taking the shale of Taiyuan and Shanxi formations in Ningwu Basin as the research object, through drilling data, TOC XRD, scanning electron microscope, mercury injection and low temperature liquid nitrogen testing, The developing strata of shale are divided, and TOC, mineral composition, porosity, pore volume, specific surface area parameter macroscopic heterogeneity and pore structure heterogeneity are analyzed. The results show that the average thickness of shale in Taiyuan formation and Shanxi formation is 32.77 m and 67.68 m respectively, which can be divided into five layers and four types of dark shale. Black shale has TOC, medium porosity and moderate water sensitivity. The micropores are mainly affected by clay mineral content, showing positive correlation, and micropores are positively correlated with TOC when the clay content is low. The macroscopic heterogeneity of coal shale is mainly influenced by deposition and structure, while the microscopic heterogeneity is affected by diagenetic evolution.
【作者单位】：中国矿业大学资源与地球科学学院;中国地质科学院;中国矿业大学煤层气资源与成藏过程教育部重点实验室;天津地质调查中心矿产资源调查院;山西省煤炭地质勘查研究院;
【基金】：中国博士后科学基金第八批特别资助项目(编号2015T80595);中国博士后科学基金项目(编号2014M551684) 国家自然科学青年基金项目(编号41402124)资助成果
【分类号】：P618.13

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