Technical Difficulty Analysis and Countermeasures for Field Data Gathering of Seismic Exploration for Coal in Gobi District

In Gobi area with loose gravel bed,the seismic signal attenuates fast,making frequency and energy be lowered;in addition,the coal seam has a chang eable buried depth and steep dipangle.Aiming at this problem,we analyzed the difficulties of gat hering seismic data in coal field and proposed some corre-sponding technical countermeasures:Using car-drill into a hole in complex surface where has complex conditions and changeable water table;in the area where the burial depth of coal seam is shallow and the dipangle is less than 45°,a small order,a small amount of explosives,and mid-point shooting excitation are used;in the area where the burial depth of coal seamis big and the dipangle issteeper than 45°, a large orde,a small amount of explosives,and the endpoint excitation are used.