Signal acquisition method for 3D seismic exploration in high density coal mining area

Abstract

The mining work in high-density coal mining areas has gradually extended to deep strata, and 3D seismic exploration technology plays a key role in the exploration of deep coal resources. Collecting high-quality 3D seismic exploration signals is the prerequisite for accurate analysis of deep coal distribution. Taking the L-city high-density coal mining area as the study area, the arrangement position of the measuring line is determined. The best excitation parameters excited by seismic waves were determined by 3D seismic test, and the optimal well depth and optimum gunpowder amount are determined as follows: the depth of the well in the thin soil covered area is 4 m deep and the dose is 2 kg; the well depth of the bedrock exposed area is 4 m and the dose is 2 kg. The positional relationship between the excitation point and the reception point is described by the three-dimensional seismic observation system. The DSU1 new generation all-digital detector converts seismic waves transmitted to the ground into electrical signals. Finally, a three-dimensional seismic survey signal is obtained. The results show that the 3D seismic survey signal collected by this method has low distortion and clearly shows the variation law of thickness profile, which has positive guiding significance for coal mining in the later stage.