Discussion on parameters of high density 3D seismic exploration acquisition in coal mining districts

High density 3D seismic technology is being popularized in coal mining districts, but there is some confused understanding about its acquisition parameters design up to now. For design of the direction of the swath, the interval of lines, the maximum offset, the CDP multiplicity and bin size, this paper analyzed and discussed these key acquisition parameters from the theoretical calculation to the engineering consideration. The result is:The bin size is related to geophone interval, line space, shot point distance and shot lines distance, space acquisition without alias depends on the size of the surface element, and the increase of the line spacing is favorable for improvement of the cost performance ratio; If the purpose is aimed at coal and structural exploration, the maximum offset may be greater than the burial depth of the target layer; In the areas with good seismic conditions, it is better for the coverage times of high density 3D seismic to be 24 times rather than too high; The design of the swath direction should't be restricted by the tectonic strike because high density 3D seismic exploration is 3D exploration by means of area acquisition. In the end, the paper gives several successful examples about different surface element size, different fold number and large line spacing, which shows the correctness of the above conclusions.