Identification of roof and floor lithology of coal measures strata based on double modes inversion method： a case of
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Graphical Abstract
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Abstract
In order to improve the classification accuracy of No3 coal seam roof and floor lithology in Sihe mine，the research of wave impedance and gamma ray pseudo acoustic impedance inversion method of dual mode identifications of coal bearing strata lithology of roof and floor were carried out to analysis well logging response characteristics of No3 coal seam roof and floor lithologyThe qualitative analysis results were used to find out the classifications of two kinds of parameters of roof and floor lithology，wave impedance and gamma rayCombined with the data of No3 coal seam in Sihe mining area，wave impedance natural gamma cross plot were used to find out the range of wave impedance and gamma quantitativelyFinally，the roof and floor lithology of common coal seam by wave impedance and natural gamma acoustic impedance double mode inversion method could be classified accuratelyThe results show that compared with the conventional impedance inversion method，the wave impedance and natural gamma pseudo acoustic impedance dual mode inversion method can accurately classify the top and bottom slate of coal seam
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