Three-dimensional imaging of subsurface structures using resistivity data

摘要: We have developed a three-dimensional inverse scheme for carrying out DC resistivity surveys, incorporating complicated topography as well arbitrary electrode arrays. The algorithm is based on the finite-element approximation to forward problem, so that effect of topographic variation data effectively evaluated and incorporated in inversion. Furthermore, we enhanced resolving power inversion using active constraint balancing method. Numerical verifications show correct earth image can be derived even when exists. By inverting real field acquired at site an underground sewage disposal plant, obtained reasonable subsurface structures, which correlates with surface geology drill log data.