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宿东矿区构造煤分布规律及构造控制机理

发布时间:2019-02-24 08:40
【摘要】:本文在矿井地质资料系统收集、整理和综合分析的基础上,结合区域构造演化分析、矿井构造特征分析、构造煤宏微观变形特征观测和煤体结构的测井曲线解译,深入进行了宿东矿区构造发育特征、叠加改造规律及其对区域构造的响应特征分析,探讨了矿井构造的形成演化及其动力学机制;揭示了不同煤体结构煤层发育规律及构造控制机理,取得了以下主要成果和认识。(1)探讨了宿东矿区构造发育及其对区域构造演化的响应特征。宿东矿区主体构造形态受宿东向斜的控制,呈NW向延伸,褶皱及断裂构造变形均较为强烈,褶皱构造主要为轴向NW的宿东向斜及伴生的次级褶皱;断裂构造以NW、近NS和NE向为主,断层性质主要为正断层,具有落差大、延伸长的特征,但在不同的构造期具有不同性质的活动。矿井构造发育对区域构造演化的响应特征十分显著,印支期近NS向构造挤压作用在本区的表现不甚明显;燕山早、中期NEE-SWW向挤压作用导致徐宿弧形逆冲推覆构造的形成和演化,宿东向斜为推覆构造南段前缘逆冲岩席的主要构造之一,受徐宿推覆构造的影响十分显著,也奠定了宿东矿区的主体构造格局;燕山晚期和喜马拉雅期构造伸展作用不仅造成了先期断裂性质的转换,并使矿区构造进一步复杂化。(2)采用断裂分形容量维法和褶皱平面变形系数法进行了矿区构造复杂程度评价。评价结果表明,主要研究对象8和10煤层断层构造发育程度均属于复杂型,而8煤层复杂程度更高;褶皱平面变形系数分析结果显示,8号煤层整体变形强于10煤层。(3)通过深入的构造煤变形特征分析,将宿东矿区构造煤发育的类型分为碎裂煤、碎斑煤、碎粒煤、鳞片煤、揉皱煤和糜棱煤等。结合钻孔测井曲线解释将煤体结构划分为3种组合类型,Ⅰ类煤体结构包括原生结构煤和变形程度较弱的碎裂煤,Ⅱ类煤体结构包括变形程度较强的碎裂煤、片状煤和碎斑煤,Ⅲ类煤体结构包括碎粒煤、鳞片煤、揉皱煤和糜棱煤;深入分析8和10煤层不同类型煤体结构发育特征及其差异性。(4)探讨了矿井构造对煤体变形的控制作用,认为褶皱构造、断裂构造和层滑构造均对煤体变形和不同类型构造煤发育具有重要的控制作用,探讨了8、10煤层不同类型煤体结构的分布规律。
[Abstract]:Based on the collection, arrangement and comprehensive analysis of mine geological data system, combined with the analysis of regional tectonic evolution, the analysis of mine structural characteristics, the observation of structural macro and micro deformation characteristics of coal and the interpretation of logging curves of coal body structure, The characteristics of structure development superposition and transformation and its response to regional structure in Sudong mining area are analyzed and the formation and evolution of mine structure and its dynamic mechanism are discussed. The development law and structure control mechanism of coal seam with different coal structure are revealed, and the following main achievements and understandings are obtained. (1) structural development and its response to regional tectonic evolution in Sudong mining area are discussed. The main structural shape of Sudong mining area is controlled by the Sudong syncline, which is extended in NW direction, and the deformation of fold and fault structure are both strong. The fold structure is mainly the Sudong syncline with axial NW and the secondary fold associated with it. The fault structure is dominated by NW, near NS and NE, and the fault is mainly normal fault, which has the characteristics of large gap and long extension, but it has different activities in different tectonic periods. The response of mine tectonic development to regional tectonic evolution is very significant, and the NS tectonic compression in the Indosinian period is not obvious in this area. The early and middle Yanshanian NEE-SWW compressions resulted in the formation and evolution of the Xuzhou-arc thrust nappe. The Sudong syncline is one of the main structures of the thrusts in the front margin of the southern segment of the nappe structure, which is significantly influenced by the Xu-Su nappe tectonics. It also establishes the main structure pattern of Sudong mining area. The late Yanshanian and Himalayan tectonic extensions not only resulted in the transformation of the character of the early faults, but also in the late Yanshanian and Himalayan periods. It further complicates the structure of the mining area. (2) the structural complexity of the mining area is evaluated by using the fractal capacity dimension method of fault and the fold plane deformation coefficient method. The evaluation results show that the fault structure development degree of 8 and 10 coal seam belongs to complex type, but the complex degree of 8 coal seam is higher. The analysis results of fold plane deformation coefficient show that the overall deformation of No. 8 coal seam is stronger than that of 10 coal seam. (3) through the deep analysis of tectonic coal deformation characteristics, the types of tectonic coal development in Sudong mining area are divided into cataclysmic coal, shredded coal and granular coal. Scaly coal, crumpled coal and bristle coal, etc. Combined with the interpretation of borehole logging curves, the coal body structure can be divided into three kinds of combination types. Type I coal body structure includes primary structure coal and broken coal with weak deformation degree, type II coal body structure includes fragmentation coal with strong deformation degree, flake coal and fragmentation coal. Type 鈪,

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