INVERSION OF POLE-POLE DATA FOR 3-D RESISTIVITY STRUCTURE BENEATH ARRAYS OF ELECTRODES

We have developed a practical algorithm for inverting gridded resistivity data for three-dimensional structure and applied it to data from an experiment designed to detect leaks from ponds. This method yields relatively accurate reconstructions of structure when applied to synthetic data, but lateral contrasts in resistivity are mapped much more accurately than are vertical contrasts. The best results are obtained when transmitting electrodes are located directly above the suspected leak. Application to real data yields results which are consistent with well data and an adjacent Schlumberger sounding.