阳泉新景煤矿构造煤发育规律及其对瓦斯赋存的控制机理

发布时间：2018-01-19 11:16

  本文关键词： 新景煤矿 构造特征 构造煤 分布规律 瓦斯特性 瓦斯赋存　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文在系统分析矿井构造特征及其发育规律的基础上,结合区域构造特征及其演化,利用钻孔测井曲线对3号煤层煤体结构进行判识,讨论了新景煤矿不同类型构造煤宏、微观变形特征及其发育的主控地质因素;同时选取典型构造煤样品进行压汞实验测试,分析其孔隙性特征;最后结合煤层瓦斯含量、构造曲率以及构造煤分布规律等,探讨了新景煤矿瓦斯赋存的影响因素,取得了以下主要研究成果。(1)新景煤矿含煤地层形成以后主要经历了印支期NS向挤压、燕山期EW向至NWW-SEE向的挤压以及喜马拉雅期NNE-SSW向挤压三期构造应力作用,不同时期形成的构造形迹相互叠加和改造,形成穹窿、盆形以及鞍状等构造。(2)新景煤矿构造煤类型发育较为齐全,碎裂煤、碎斑煤、碎粒煤、鳞片煤、揉皱煤和糜棱煤均可见到。不同构造煤类型形成于不同的应力-应变环境,在宏、微观变形特征上表现出特有的变形特征。构造煤的发育主要受到褶皱构造以及小构造影响。(3)运用聚类分析的方法将3号煤层煤体结构划分为三大类,并总结了各自测井曲线变化特征,对3号煤层煤体结构进行了判识和分层定厚。提出和定义了钻孔煤体结构破坏值,结合Ⅱ类煤和Ⅲ类煤百分比等值线图以及煤体结构破坏值等值线图,分析了3号煤层煤体结构分布规律。(4)从压汞实验测试数据可以看出,不同类型构造煤具有不同的孔隙性特征。从原生结构煤-糜棱煤,总孔容、孔隙度以及中值孔径均呈现先增大后减小的变化趋势,同类型构造煤样品之间孔比表面积离散性较强,整体变化趋势不稳定。原生结构煤以微孔和过渡孔为主,随着变形程度的增强,原生孔遭受破坏,微孔所占比例减少,宏观裂隙和大孔数量增加。将新景煤矿的构造煤压汞曲线划分为“平行型”、“尖棱型”、“反S型”和“双S型”四种孔隙结构类型,代表了四种不同的孔隙形态及其连通性,对煤层中瓦斯运移、富集产生不同程度影响。(5)影响新景煤矿瓦斯赋存的因素有煤变质程度、煤系组合特征、煤层埋藏深度、水文地质条件、煤层的后生冲蚀作用等,而矿井构造控制下的煤体结构的非均质性分布与矿井瓦斯赋存差异性具有一定相关性。
[Abstract]:On the basis of systematic analysis of mine structure and its development law, combined with regional structural characteristics and evolution, this paper uses borehole logging curve to identify coal body structure of No. 3 coal seam. The characteristics of macro and micro deformation of different types of tectonic coal in Xinjing Coal Mine and the main geological factors controlling their development are discussed. At the same time, the typical structural coal samples were selected for mercury injection test, and the porosity characteristics were analyzed. Finally, combined with coal seam gas content, structural curvature and distribution of structural coal, the influence factors of gas occurrence in Xinjing coal mine are discussed. After the formation of coal-bearing strata in Xinjing coal mine, it mainly experienced NS compression during the Indosinian period. During the Yanshanian EW to NWW-SEE compressions and the Himalayan NNE-SSW compressional third tectonic stress the tectonic traces formed in different periods superimpose and transform each other to form the fornix. Basin-shaped and saddle-shaped tectonics. 2) Xinjing coal mine has a complete development of structural coal types, such as broken coal, broken spot coal, broken grain coal, and squama coal. Different types of tectonic coals are formed in different stress-strain environments in macros. The development of tectonic coal is mainly influenced by fold structure and small structure. The coal body structure of No. 3 coal seam can be divided into three categories by cluster analysis. The characteristics of log curves are summarized, and the structure of coal body in No. 3 coal seam is identified and stratified to determine the thickness. The failure value of coal body structure in borehole is put forward and defined. Combined with the percentage isoline diagram of type 鈪，

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