Explored And Estimated Resources Of Nappe Tectonics-coal In Central Hunan Depression

Center Hunan region is one of the important coal production base in self-province. In the area distribution all of coal mines, for example, Niumasi coal mine, Jinzhushan coal mine and Hongshandian coal mine and so on. As a result of the long-term exploration and utilization, the shallow and exposed area’s coal resources almost dried up. The concealed area“tectonic and under old strata”will be the focus of new coal resources exploration work.Based on the coalfield structure and the actual demand of coal prospecting in center Hunan, We take the structural geology theory as the guide, taking the research of coal-controlled structure as the core, and taking lithofacies paleogeographic and sedimentary facies analysis as the main tool to systematically research characteristics of nappe tectonics and decollement, sedimentary environment and coal-controlled. We do the research through the combination coal-controlled law of nappe tectonics and decollement, to predict the potential coal resources of nappe tectonics and decollement in Xiangzhong depression.Since from Late Paleozoic, due to Xiangzhong depression has undergone multiphase tectonic movement, the late transformation of coal seam strata is more noticeable, which made coal field geological structure is complex and well-developed nappe. Based on previous work, the nappe tectonic geometry, formation mechanism, transformation research and control of coal characteristics in detail and using the nappe tectonic research, and according to the coal occurrence conditions in the area, fracture structure exhibition characteristics and the characteristics of the different geological background and cause, put forward the favorable coal occurrence section. In this paper,we conclused 7 style coal-controlled in Lianshao coalfield,divided into 3 one-level regions:Lianyuan mining area,Shaoyang mining area,Qiling mining area;8 two-level regions, and contained 7 nappe tectonic coal.Adopting geological block method, predict the potential coal-resources 1.33 milllion tons in Xiangzhong depression.Among of them, lower-Carboniferous coal-resources 0.84 milllion tons, lower-Jurassic coal-resources 0.41 milllion tons,Permian coal-resources 0.07 milllion tons.At the same time, summarized a set of law and new idea in searching for coal under nappe, provide theoretical guidance for under nappe coal resources.