基于测井约束反演的阳泉新景矿区K_(2)下灰岩精细刻画

Fine Characterization of K_(2) Lower Limestone in Xinjing Mining Area of Yangquan Based on Logging Constrainted Inversion

为了提高阳泉新景矿区15#煤顶板岩性预测精度,采用测井约束的波阻抗反演方法展开研究。在测井曲线精细预处理的基础上,进行了准确的时深标定,并建立了高分辨的反演模型,优化了反演参数,得到了K_(2)下灰岩波阻抗体。经过K_(2)灰岩顶底层位追踪,并辅以精确的时深转换,最终实现对K_(2)下灰岩的精细刻画,为采掘巷道的支护工作提供有效指导。研究结果表明:波阻抗反演方法是一种高效、经济的岩性预测方法,其能够有效实现对目的层厚度、地层起伏形态等地质问题的预测,精确的时深转换结合钻孔数据等地质信息能够进一步提高反演方法的预测精度。预测得到的灰岩厚度以及其起伏形态与已探明的地质情况基本吻合,表明该预测结果能够为采掘巷道支撑点位置的选择和优化提供可靠依据,从而实现提高矿区煤层采掘效率的目的。

In order to improve the prediction accuracy of roof lithology of No.15 coal seam in Yangquan Xinjing mining area,the wave impedance inversion method constrained by well logging is used for research.Based on the fine preprocessing of logging curves,the accurate time-depth calibration was carried out,and the high-resolution inversion model was established.The inversion parameters were optimized.Finally,the limestone wave impedance under K_(2)is obtained.Through the top and bottom horizon tracking of K_(2)limestone and accurate time-depth conversion,the fine characterization of K_(2)limestone is finally realized,which provides effective guidance for the support work of mining roadway.The research results show that the wave impedance inversion method is an efficient and economic lithology prediction method,which can effectively predict the geological problems such as the thickness of the target layer and the fluctuation morphology of the formation.Accurate time-depth conversion combined with geological information such as borehole data can further improve the prediction accuracy of the inversion method.The predicted limestone thickness and its fluctuation pattern are basically consistent with the proven geological conditions,which proves the accuracy of the prediction results,indicating that the prediction results can provide a reliable basis for the selection and optimization of the support point position of the mining roadway,so as to improve the mining efficiency of the coal seam in the mining area.