Two-dimensional Gauss-Newton inversion based on marine CSEM data

With development and continuous improvement of methods and technologies, more and more attention has been paid to research of marine controllable source electromagnetic inversion. How to develop a fast and practical marine controllable source electromagnetic inversion method is one of the current research focuses and hot spots. So it is necessary for the development of marine controllable source electromagnetic to study the 2D fast, reasonable and effective inversion, which has important theoretical and practical significance. In this paper, the traditional Gauss-Newton inversion is carried out on the basis of the adaptive finite element forward simulation, and the simulation data and the Occam inversion results are systematically analyzed and compared. The classical model inversion results show that both Occam inversion and Gauss-Newton inversion can invert the anomalies well and the inversion results have their own advantages and disadvantages. Occam inversion RMS is low, the result is smoother, the convergence is stable; the Gauss-Newton inversion time is short, and the number of iterations is small. This is helpful for the later marine controllable source electromagnetic method data interpretation and application.