湘中地区煤系构造递进变形规律及构造控煤模式研究

The coalfield structure is one of the important factors affecting China's coal resource exploitation, identification of structural deformation mechanism and control factor is the prerequisite condition and basis work for coal resource exploitation. Based on the structural framework, structural deformation of coal measures characteristics and its control factors, the Central Hunan was selected as the research area, synthetically used the multi-subject theories and methods of coal geology, structure geology, geological background research, mining geology research, test analysis and numerical simulation will be unfolded. Structural configuration and its spatial distribution in response to Coal measures and of coal bed structural deformation characteristics.The differentiation of tectonic deformation in representative sections will be analyzed in detail to establish Structural styles and structural deformation law. Geodynamic environment, tectonic evolution，deep structure and basement property, tectonic stress fields，lithologic asociation within coal measures and adjacent strata series will be studied to reveal the main control factors of coal measures structural deformation.The dynamics genetic mechanism of coal measures structural deformation will be analyzed to establish tectonic pattern.In practice, provide the scientific instruction for coal resource exploitation and utilization.

煤田构造是影响煤炭资源开采的重要因素，查明煤系构造变形递进规律和控制因素则是煤炭资源开发的前提和基础性工作。以湘中地区煤系构造变形为研究对象，从区域构造格局、构造变形特征及控制因素切入，运用煤田地质学和构造地质学的理论和技术，通过野外地质调查、矿井地质调查、测试分析、数值模拟等手段，分析煤系及煤层构造变形特征、构造-热演化及构造应力场等，深入研究构造形态及其空间展布规律。详细剖析典型地质剖面构造变形差异性原因，建立控煤构造样式的分类，探讨研究区煤系构造递进变形规律。从地球动力学环境，构造演化历程、深部构造和基底属性、构造应力场作用以及煤系岩性组合特征等方面，揭示煤系构造变形的控制因素。根据煤系构造变形的动力学成因机制，建立控煤构造模式，为南方缺煤地区煤炭资源调查评价提供依据。

煤田构造是影响煤炭资源开采的重要因素，查明煤系构造变形递进规律和控制因素则是煤炭资源开发的前提和基础性工作。以湘中盆地煤系构造变形及煤层变质作用为研究对象，从区域构造格局、构造变形特征及控制因素切入，通过野外地质调查、矿井地质调查、测试分析、数值模拟等手段，深入分析煤系及煤层构造变形特征、构造演化及煤层变质作用。主要结论为：（1）湘中盆地构造格局呈现南北分区、东西分带性特征：西部为逆冲推覆构造带；中部为隔档式褶皱与逆冲断层组合；东部为逆冲断裂与宽缓褶皱带组合。地层岩性组合差异性导致发育多个滑脱层，造成垂向层次构造变形的不同，其主控因素是沉积物质基础以及印支期、燕山-喜山期的区域构造应力场转换。（2）湘中盆地以挤压型控煤构造样式为主，控制了煤炭资源的现今赋存状况。根据煤系构造变形的动力学成因机制和分布特征提出隔档式褶皱和隔槽式、逆冲推覆、滑脱构造等的控煤模式。（3）天龙山岩体侵位引起的岩浆热及构造应力，促使煤大分子结构趋向有序化， d002减小，La、Lc增大，逐渐过渡为隐晶质石墨；岩体侵位施加放射状挤压应力集中带，节理与岩组主压应力轴方位与岩体边界近于垂直，靠近岩体构造变形增强；岩体附近煤层受岩浆热作用显著，煤中REE含量增加，岩浆热变质作用驱使稀土元素向富轻稀土方向演化，构造应力驱使稀土元素向着富重稀土的方向演化。煤中形成更多新孔隙（分布在小于100 nm的孔径段），导致总孔容和比表面积增大。