Evaluation Of Jurassic Coal Resource Potential In The East Of Sanchakou Of Yuka Coal Field In Qinghai Province

There is no Jurassic show on the surface of the study area in the eastern part of the Sanchakou,where is coal-bearing area and the leading area of coal-seeking in Yuqia coal field.Through the study of coal control structure pattern,coal forming environment and coal resource potential evaluation in the eastern part of the Sanchakou,which has reference significance for coal searching in other hidden areas of Yuka coal field.Based on the study of structural controlling coal and coal-accumulation regularity,we analyzed the coal resources potential of eastern Sanchakou with the Jurassic Dameigou Formation as the research focus and according to the previous data.Eastern Sanchakou located in the eastern part of Iqe Coal Field,Presently,we found the Jurassic Dameigou Formation(J2d)is the coal-bearing,including the regional main coal seam M7,the tendency of coal measures for the overall distribution formed south monoclinal structure.The structural type of the Beishan and Niida exploration area is folds and faults,we speculated the structural type of the eastern Sanchakou exploration area belongs to the folds and faults.The Beishan exploration area developed alluvial fan,braided stream and meandering river coal-bearing environment from north to south in the northern part of the study area.The Niida exploration area developed braided river delta and meandering river coal-bearing environment in the southern part of the study area.We speculate the coal accumulation environments of the eastern Sanchakou is delta coal-bearing environment,and according to the current construction of ZK2 borehole the coal accumulation environments is identified as the braided river delta coal-bearing environment.Based on a rough estimate resources,and using the evaluation system of coal resources and the grade of characteristics,we analyzed the coal resource potential of eastern Sanchakou is a better level,which belongs to the advantageous area resources enrichment,and has the potential of resource utilization.According to our research results,combined with predecessors' information of Yuqia coal field,the key direction of coal searching in the concealed area of the coal field is the deltaic coal forming environment area in future.Under such coal-forming environment,the coal seam is thick and widely distributed,which conducive to forming favorable areas for resource enrichment,In addition,in terms of structure,the extruded folding fault(folded)type structure zone is mainly selected.Under the influence of the fault,the depth of the buried coal seam becomes relatively shallow,which is conducive to further coal searching.