测井技术2018，Vol.42Issue(1)：31-35,5.DOI:10.16489/j.issn.1004-1338.2018.01.006
基于井间电磁波CT在浅地层溶洞探测中的正反演
Forward and Inversion Modelling of Cross-Hole Electromagnetic Wave Computerized Tomography in the Shallow Cave Detection
摘要
Abstract
The shallow cave detection is one of the main geological problems of the subway engineering construction project in the karst region.T he traditional drilling method cannot completely solve the problem of the particular karst cave.The cross-hole electromagnetic CT imaging technique is a new geophysical technique developed in engineering geophysical field in recent years.Based on the fundamental principles of cross-hole electromagnetic wave CT imaging technique,this study established theoretical models of geological bodies to compare images of 3 inversion algorithms.The result shows that the effect of simultaneous iterative reconstruction technique(SIRT)inversion is the best.Meanwhile,the SIRT is used to evaluate the influence of different center distance of two caves in the exploration.It is concluded that the shape of the double caves can be effectively identified w hen the center distance is 8 meters and 3 meters. However,the double caves appear as one anomaly in the inversion contour map when the center distance is 1 meter.T he simultaneous iterative reconstruction technique(SIRT)is applied to the cave exploration of a subway project,which has achieved good application results.关键词
测井应用/井间电磁波CT/浅层溶洞/吸收系数/反演Key words
log application/cross-hole electromagnetic wave Computerized Tomography(CT)/shallow karst cave/absorption coefficient/inversion分类
天文与地球科学引用本文复制引用
张晓峰,黄毓铭,黄成民..基于井间电磁波CT在浅地层溶洞探测中的正反演[J].测井技术,2018,42(1):31-35,5.基金项目
基于电测井的裂缝正演模拟研究基金资助项目(GJJ150579) （GJJ150579）
