Research on evaluation technology of gas anomaly zone in Xiadian Mine based on 3D seismic monitoring technology

Abstract

ABSTRACT Based on the analysis of the theory of seismic exploration, this paper evaluates the quality of three-dimensional (3D) seismic data, analyzes the reflection characteristics of coal seam, and forecasts the thickness of coal seam qualitatively and quantitatively by using seismic attribute and wave group anti inversion method, and obtains the thickness plan of minable coal seam in Xiadian mine. According to the coal seam gas content and gas relative emission, it is predicted that the upper limit of gas relative emission in the mine will change from 1.38 to 20.30 m3/t·d, which is a low biogas mine area with high biogas area in some parts, and the destruction factors of No. 21 coal seam and No. 43 coal seam are abnormal in some parts, which are structural coal. The development of No. 21 coal seam is stable, with the thickness variation range of 0.5 ~ 12.5 m and the average thickness of about 4.3 m. The thickness of No. 43 coal seam is lower than that of No. 21 coal seam. The inversion thickness variation range is 0 ~ 4 m and the average thickness is about 2.5 m. The overall thickness of NO. 43 coal seam has little change. The gas anomaly area of No. 21 coal seam is mainly distributed in the form of dots, the lowest line of monoclinic structure and the monoclinic half slope are mainly distributed in two distribution belts in the form of dots, while the gas anomaly area of No. 43 coal seam is scattered with small area.