跨孔电磁波CT成像技术在岩溶勘查中的应用

摘要

跨孔电磁波CT成像技术是将医学CT应用于地球物理学的一项新技术,该方法是采用对称偶极天线在一孔中发射电磁波,在另一孔中接收电磁波场强,反演重建地下介质的吸收系数分布. 它主要依据电磁波在不同介质中传播时的吸收差异,重建井间介质吸收系数的分布图像,直观及形象地展现研究区域的地质结构.本文以跨孔电磁波CT成像技术的基本原理为基础,根据电磁波在不同介质中传播时的吸收差异来判别岩溶,同时将该方法应用于广西某地拟建地铁工区的岩溶勘查之中,取得了良好的应用效果.%Cross-well electromagnetic CT technology is a new technology applying medical CT to geophysics. Based on the absorption differences of the electromagnetic wave spread in different medium, it rebuilds the distri-bution image of cross-well medium absorption coefficient, which visually and intuitively shows the geological structure of the study area. This paper studies the basic principle of cross-well electromagnetic logging, and applies the method to karst exploration in the subway working area in GuangXi Zhuang Autnomous Region, and has ob-tained a good application effect.