Geostatistical Integration of Gravity and Magnetotelluric Data

We have studied the feasibility of using the geostatistical approach to enhance the analysis of sparsely obtained MT (magnetotelluric) data by combining them with gravity data. The use of geostatistics to integrate MT data with gravity data was attempted. To evaluate the feasibility of this approach, the interrelationship between the geological boundary and the density distribution was studied. The conversion of the corrected density distribution to a more sensitive geological boundary by maximizing the correlation coefficient between the distributions of resistivity yielded MT inversion and density distributions under the assumption that boundary locations have a high correlation. Next, the correlation between the resistivity structure from MT data and the density structure from gravity inversion was analyzed. Afterwards, the density distribution was converted into the resistivity distribution to yield local mean values for the residual analysis of the resistivity structure. Then, using this method, models and field data from a real intrusive igneous area were tested. The results of the model test agreed well with those of the real model. Moreover, with the real field data, the geostatistical approach used herein demonstrated relatively satisfactory results.