Improved Potential Field Correlation Imaging Method

Potential correlation imaging method uses the correlation coefficient of the anomaly generated by the different location of geologic bodies and the observed data to rapidly obtain the location of the causative sources. The existing correlation imaging methods only use the sphere to simulate the shape of the geologic bodies, when the real shape of the source is different from sphere, and the inversion results suffer large errors. To solve this problem, we present improved correlation imaging method, which computes the correlation coefficients of the observed anomaly and the anomalies generated by different types of the model, respectively, and the larger one of the maxima of the correlation coefficients calculated by different models corresponds to the true model. The improved method can both obtain the depth and the nature (structural index) of the source. We use the analytic signal to compute the correlation coefficient of magnetic anomaly, which can avoid the interference of magnetization direction, and the calculation equation is simpler. We try the method on synthetic potential field data, and the inversion results indicate that the method can successfully finish the inversion of potential field data, and produce more stable results. We have also applied it to measured magnetic data, and we obtain the distribution of the unexploited body.