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The coal bed methane (CBM) content is often relatively high where the immediate roof and floor of the coal seam are mudstone. In order to predict the CBM rich region, position of coal seam roof and floor and distribution of sandstone and mudstone are based on acoustic wave impedance inversion and pseudo-acoustic inversion technique through seismic data and well logging data analysis. This method provides a basis for the exploration and development of the CBM. First of all, the position of coal seam roof and floor can be acquired accurately in the acoustic wave impedance inversion profile due to low acoustic impedance values of coal. Pseudo-acoustic curve is constructed by natural gamma curve. In the pseudo-acoustic inversion profile which has high lateral continuity, the mudstone shows high values, the sandstone shows low values, so it is possible to characterize the sandstone and the mudstone when the range is acquired though data analysis. The application in practice shows that, the inversion method is better than conventional one in resolution and achieved good results in practice.

Application of Pseudo-acoustic Inversion Technique in Identifying Sandstone And Mudstone of Coal Seam Roof And Floor