Study and Validation on a Novel Multi-dimensional Marine Electromagnetic Prospecting Nonlinear Inversion Algorithm

In order to study and verify the practical application effect of multi-dimensional nonlinear conjugate gradient inversion in the exploration of marine natural gas hydrate, a novel multi-dimensional marine electromagnetic prospecting nonlinear inversion algorithm was proposed in this paper. On this basis, the data of marine controlled-sources electromagnetic collected by the Scripps Research Institute of the USA were used to analyze the hydrostatic results of this multi-dimensional nonlinear conjugate gradient inversion algorithm. The results show that the nonlinear conjugate gradient inversion proposed in this paper can clearly reflect the conductivity distribution structure of the area below the bottom of the sea surface 1~2 km of formation. The local inversion results of this method are basically consistent with the seismic reflection, seismic sequence and logging analysis results, and it has a strong resolution to small size anomalies and shallow high-resistivity bodies.