1.Introduction
The coal bearing stratum in Wanli No.1 coal mine is Jurassic Yan'an formation. There are 11 minable coal seams and 3 stable minable coal seams. According to the mine exposure data, the water abundance of fracture pore confined water aquifer in Yan'an formation is heterogeneous. In addition, there are 1-2 coal mined out areas in the mining area, but the mined out area is not clear.
2.Treatment solution
Due to the different restrictions of topography and geology conditions, water bearing structure and discharge conditions, the distribution of water rich is uneven. In order to ensure the safe recovery of Wanli No.1 mine, CCTEG Xi'an Research Institute adopts the sensitive transient electromagnetic exploration method to reflect the aquifer, and to the aquifer rich area of Yan'an formation and the gob of 1-2 coal mine which affect the lower coal mining The area was explored.
3.Construction situation
The exploration area is about 3km². 4129 TEM physical points were actually collected, including 32 test points, 152 quality inspection points and 3km² control area. The workload required by the contract was completed. According to the statistical rating, the quality of the original data met the specification requirements.
Schematic diagram of exploration area
Digital topographic map of exploration area
4.Achieved accomplishment
Based on the processing of TEM data, combined with drilling, related maps and other geological data of each layer, the low resistivity abnormal area in the target layer is comprehensively analyzed; on the basis of inversion resistivity data, the distribution range of low resistivity abnormal area in the target layer is explained, and the water bearing / rich property of low resistivity abnormal area in the target layer is summarized and inferred. The main results are as follows.
(1) 1-2 coal goaf and water goaf are delineated
According to the results of electrical method and the analysis of geological data, the scope of water accumulation in 1-2 coal goaf in the northwest block is delineated. Due to the change of stratum elevation, groundwater converges, and the seepage of accumulated water will enlarge the abnormal range of corresponding position. On this basis, the scope of gob with accumulated water is outlined, which includes the part affected by the infiltration of accumulated water, which is slightly different from the actual scope of gob with accumulated water. The water rich area of 1-2 coal seam water goaf / Zhiluo Formation aquifer in the survey area of southeast block is delineated. It is inferred that the gob with accumulated water in Xiaoyao is near the edge of machangyao gully, and the aquifer rich area in Zhiluo formation may be far away from the edge of machangyao gully. It is not easy to distinguish the two cases only by the results of electrical method. In the northeast corner of the southeast block, there is a local small-scale weak low resistivity anomaly, which is inferred to be a relatively sub rich area of Zhiluo Formation aquifer.
Plan of resistivity anomaly near 1-2 coal seam
(2).Water rich area at the bottom of Yan'an formation sandstone aquifer is delineated
Two water rich areas are delineated at the bottom of the sandstone aquifer of Yan'an formation, and the plane position of the water rich area coincides with the gob near 1-2 coal seam. The water yield at the bottom of Yan'an formation sandstone aquifer is not uniform.
Plan of resistivity anomaly of aquifer in Yan'an Formation
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