贵州青龙矿构造煤及瓦斯非均质性分布规律研究

发布时间：2018-03-04 23:00

  本文选题：构造特征　切入点：孔隙特征　出处：《中国矿业大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文在系统分析青龙矿井构造特征及其发育规律的基础上,通过主采煤层16号、18号煤不同类型构造煤宏、微观变形特征分析和钻孔测井曲线煤体结构类型的判识,结合区域构造特征及其演化分析,探讨了青龙煤矿构造煤发育、分布特征及构造控制作用;通过典型构造煤样品的压汞实验测试,分析了不同类型构造煤的孔隙结构特征;结合煤层瓦斯含量数据分析,深入探讨了青龙煤矿瓦斯赋存特征及其影响因素。取得了以下主要成果和认识:(1)青龙矿含煤地层自形成以后主要经历了印支期、燕山期和喜马拉雅期三期构造演化,印支期近NS向挤压,主要形成一些近EW向的小型褶皱,在持续的挤压下,形成一系列的逆断层;燕山期NW-SE向挤压构造运动奠定了矿井构造格架,矿区内广泛发育NE-SW向逆断裂及褶皱,同时改造了印支期EW向构造,使得构造线走向发生一定的偏转;喜马拉雅期NE-SW向挤压作用,最为突出的特征是使燕山期NE向逆断层转变为正断层性质。(2)青龙矿构造煤发育较为强烈和普遍。通过构造煤宏、微观变形特征分析,将构造煤划分为碎裂煤、碎斑煤、碎粒煤、片状煤、鳞片煤、揉皱煤和糜棱煤等7种类型,通过测井曲线判识将16、18号煤层煤体结构划分为I类原生结构煤、Ⅱ类弱变形构造煤和Ⅲ类强变形构造煤三类,I类为原生结构煤,Ⅱ类为碎裂煤,Ⅲ类为碎斑煤、碎粒煤、片状煤、鳞片煤、揉皱煤和糜棱煤等。通过对16、18号煤层煤体结构进行测井判识和分层定厚,分析了构造煤分布规律,深入剖析了不同类型、不同性质构造对构造煤发育的控制作用。(3)通过构造煤样的压汞实验,分析了不同类型构造煤孔隙特征、孔径结构演化和孔隙形态及连通性变化特征,探讨了构造煤结构与孔隙结构特征的内在联系。(4)深入探讨了影响青龙矿构造煤及瓦斯非均质性分布地质因素,通过矿井构造、煤层顶板岩性、煤层埋藏深度、煤变质程度、煤岩组分和水文地质条件等分析,得出矿井构造是瓦斯的非均质性分布的主控地质因素。
[Abstract]:On the basis of systematic analysis of the structural characteristics and development law of Azure Dragon coal mine, this paper analyzes the characteristics of macro and microscopic deformation of different types of structural coal in coal seam No. 16 and No. 18 in main mining seam, and identifies the structural types of coal body in borehole logging curve. Based on the analysis of regional structural characteristics and evolution, the development, distribution and tectonic control of tectonic coal in Azure Dragon coal mine are discussed, and the pore structure characteristics of different structural coals are analyzed through mercury injection test of typical structural coal samples. Based on the analysis of coal seam gas content data, the characteristics of gas occurrence and its influencing factors in Azure Dragon coal mine are discussed in depth. The following main achievements and understanding have been achieved and the coal bearing strata in the Azure Dragon mine have mainly experienced the Indosinian period since the formation of the coal-bearing strata. During the Yanshanian and Himalayan periods, the tectonic evolution of the third stage, the Indosinian period near NS compression, mainly formed some near EW direction of small folds, under continuous compression, forming a series of reverse faults; The Yanshanian NW-SE compressional tectonic movement laid the framework of the mine structure, and the NE-SW reverse faults and folds were widely developed in the mining area. At the same time, the Indosinian EW trending structure was reformed, which made the tectonic line strike deflected to a certain extent, and the Himalayan NE-SW compressional process occurred. The most prominent feature is that the tectonic coal of Azure Dragon mine developed strongly and generally from NE to normal fault in Yanshanian period. Based on the analysis of tectonic coal macro and microscopic deformation characteristics, the tectonic coal is divided into cracked coal, fragmentary coal and granular coal. There are 7 types of flake coal, flake coal, crumpled coal and mylonian coal. The coal body structure of coal seam 16,18 is divided into I type primary structure coal, 鈪，

本文编号：1567657