Abstract:
According to the logging response characteristics of different coal structures, this paper quantitatively identified and described the coal structure in the research area, verified the results by drilling and coring. By using the single layer gas production effect and the productivity contribution index of per meter of coal thickness, the development effect of different coal structure coal seams in the research area is evaluated and development suggestions are proposed. The results show that: the coal structure index obtained from the compensation acoustic wave, compensation density and borehole diameter logging response can be used for quantitative identification of the coal body structure, the coal structure index less than 500 is the primary structure coal in the research area, and more than 600 is the tectonic coal; the productivity contribution of primary structural coal and cataclastic coal per meter of coal thickness in well Y1 in the research area is from 600 m3/m to 1 200 m3/m, while that of tectonic coal is less than 500 m3/m,the productivity contribution decreases with the increase of coal body structure index; under the current development technology conditions, it is not suitable to directly develop CBM from tectonic coal.