湘中坳陷推覆构造找煤及其资源量估算研究

发布时间：2018-03-23 04:01

本文选题：推覆构造　切入点：滑脱构造　出处：《湖南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：湘中地区是湖南省重要的煤炭生产基地,区内分布有牛马司、金竹山、洪山殿等不同煤种的煤矿。由于长期的勘探利用,浅部和近地表的煤炭资源接近枯竭。“构造下和老地层下”等隐伏区将是煤炭资源勘查新的工作重心。针对湘中地区煤田构造与找煤工作的实际需求,论文对湘中地区推覆、滑脱构造特征、沉积环境特征、控煤规律进行比较系统和深入地研究,以构造地质理论为指导、以构造控煤研究为核心、以岩相古地理分析、沉积相分析为主要手段,结合推覆、滑脱构造控煤规律研究,预测湘中坳陷推(滑)覆构造下潜在煤炭资源。晚古生代以来,湘中坳陷经历了多期构造运动,对煤系地层的后期改造非常明显,导致煤田地质构造较复杂、推覆构造较发育。在前人研究基础上,对推覆构造几何形态、形成机理、转型研究及控煤特征进行了详细研究,依据研究区内煤系赋存状况,推覆断裂构造展布特点,湘中坳陷发育不同的聚煤中心,圈出湘中坳陷有利的赋煤区段和推覆构造煤分布区域。总结涟邵煤田的七种控煤样式,将湘中坳陷分为三大区(涟源含煤区、邵阳含煤区、祁零含煤区)、八亚区。采用地质块段法,预测湘中坳陷潜在推覆构造煤资源总量有1.33亿吨,其中,下石炭统0.84亿吨,上二叠统0.41亿吨,下侏罗统0.07亿吨。同时,总结了一套推覆体下找煤的方法,为在类似煤田推覆构造下寻找煤炭资源提供理论上的指导。
[Abstract]:The central Hunan region is an important coal production base in Hunan Province. There are coal mines of different kinds such as Niumasii, Jinzhushan, Hongshandian, etc. Due to long-term exploration and utilization, The shallow and near surface coal resources are nearly exhausted. The hidden areas such as "under structure and old strata" will be the new focus of coal resources exploration. In view of the actual demand of coalfield structure and coal prospecting work in central Hunan, the paper overrides the central Hunan area. The characteristics of slippage structure, sedimentary environment and coal control are studied systematically and deeply, which is guided by tectonic geology theory, taking structural coal control study as the core, taking lithofacies paleogeography analysis and sedimentary facies analysis as the main means. Combined with the study of nappe and slip tectonics, the potential coal resources under the nappe (slip) tectonics in the central Hunan depression are predicted. Since the late Paleozoic, the central Hunan depression has undergone multiple tectonic movements, which is very obvious for the late transformation of the coal measure strata. The geological structure of coal field is more complex and the nappe structure is more developed. Based on the previous studies, the geometry, formation mechanism, transformation and coal control characteristics of nappe structure are studied in detail, according to the occurrence status of coal measures in the study area. The distribution characteristics of nappe fault structure, the development of different coal accumulation centers in the central Hunan depression, the favorable coal-bearing section and the nappe structure coal distribution area in the central Hunan depression, and the seven types of coal control in Lianshao coalfield are summarized. The central Hunan depression is divided into three regions (Lianyuan coal-bearing area, Shaoyang coal-bearing area, Qi coal-bearing area, Basub-area). By using the geological block method, the total potential nappe coal resources in the central Hunan depression are predicted to be 133 million tons, of which 84 million tons are lower Carboniferous. 41 million tons of Upper Permian and 7 million tons of Lower Jurassic. At the same time, a set of methods for finding coal under nappe are summarized, which provides theoretical guidance for the exploration of coal resources under similar nappe structures.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11

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