| The study area is Lingwu mining area,which belongs to Ningdong coal field of Ningxia.It covers an area of 150km~2.It is located in the southwest edge of Ordos Basin and belongs to Majiatan community of Ordos basin edge,which is subordinate to North China stratigraphic area.The main large-scale wells in the study area from south to north are Zaoquan,Yangchangwan and Lingxin.Ningxia has the sixth largest proven coal reserves in China,and Ningdong coal field is a large coal base of 1.3 billion tons.At present,the coal mining work is gradually advancing to the deeper stratum,which has faced severe geothermal problems.Based on the task of compiling the geological report on the production of Yangchangwan Coal Mine in Lingwu mining area of Ningxia Hui Autonomous Region,this paper chooses the increasingly urgent threat of heat disaster faced by each mining area in the study area as the research object,and on this basis,it is necessary to conduct a deeper study on the geothermal energy,which is of great significance for the mine production in the study area to achieve the goal of stable production and safety.Based on the comprehensive study of geological,geophysical and borehole data of Lingwu mining area and its surrounding areas,it is determined that the surface is covered by Quaternary sand,gravel and loess.The Paleozoic strata are deeply buried,and only bedrock is sporadically exposed.The study area belongs to Ningdong coalfield.Through the sorting of the drilling data,the stratum overburden of the study area is quaternary system,and the sedimentary strata are Yanchang Formation of Upper Triassic,Shangtian formation of Upper Triassic,Yan’an formation,Zhiluo Formation and anding formation of Middle Jurassic,and Yijun formation of Lower Cretaceous from the old to the new.The main coal bearing stratum is Yan’an formation of Middle Jurassic.Through collecting and sorting out the geological reports of each mining area in Ningdong coalfield and the borehole geotemperature data in the exploration stage,combining with the hydrological and field observation data collected during the field survey,the geotemperature distribution map of the 2nd,11th and 16th coal seams in Lingwu mining area is drawn,and the conclusion is that the relationship between the geotemperature and the depth in the study area increases synchronously and proportionally,which conforms to the normal law;the main coal seam heat damage areas are mostly distributed In the deep part of different mining areas in the study area,the distribution range of heat damage areas at all levels gradually increases with the increase of coal seam burial depth from north to South;the distribution pattern of heat damage areas is controlled by fold structure,less distributed in the axis of anticline,larger distributed in the deeper position of the elevation of the two wings of anticline;finally,some suggestions for the development and utilization of heat damage geothermal resources in the mine are put forward,so as to achieve The purpose of ensuring production safety and reasonably developing and utilizing resources.Through this research work,the abnormal area of thermal damage in the study area is demarcated,and the distribution law of thermal damage in the study area is studied by drawing a chart,which provides a reference for the prevention and control of thermal damage in the deep mining of each mine in Lingwu mining area.It is expected that this research can provide suggestions for the safe production of Ningdong coal field and the development and utilization of geothermal resources,as well as Make contribution to clean energy utilization in Ningxia,promote the development of green energy and improve the living standards of local people. |
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