寺家庄矿煤层顶板岩性有色反演预测

Lithology Prediction of Coal Roof Rock in Sijiazhuang Coal Mine Using Colored Inversion Algorithm

煤层的顶板岩石的封堵性对煤层气的储集非常关键。有色反演可以获得相对波阻抗的变化,对测井的依赖度低、平面分辨率高,可用于少井区煤层顶板岩性的分布进行预测。在原始地震数据谱蓝化处理、提高分辨率的基础上,对寺家庄矿三维地震数据进行了有色反演,预测了9号、15号煤层顶板岩性。结果表明:相对波阻抗体异常与钻孔岩性较为吻合,并通过相对波阻抗平面分布图预测了寺家庄地区9号、15号煤层顶板岩性,且不同时间地层切片的反演结果与区域钻孔资料相吻合,说明有色反演结果可靠,可以对煤层顶板岩性分布特征进行有效预测。

Plugging of roof rock in coal seams is critical to the storage of coalbed methane.The method of colored inversion can obtain the change of relative wave impedance,features low dependence on logging,and high plane resolution,and can be used to predict the distribution of lithology of coal seam roof in less-welled area.Based on the blueprinting of the original seismic data and the improvement of resolution,a colored inversion of the 3D seismic data of the Sijiazhuang Coal Mine was carried out and the lithology of the No.9 and No.15 coal seam roofs was predicted.Results show that the relative wave impedance anomaly is consistent with the lithology of the borehole,the lithology of the topsoil of No.9 and No.15 coal seams is well predicted on the relative wave impedance plane distribution map,and the inversion results and regions of the stratigraphic slices at different times are predicted.The borehole data are consistent,indicating that the colored inversion results are reliable and can effectively predict the lithology distribution characteristics of the coal seam roof.