METHODS AND APPARATUS FOR THREE-DIMENSIONAL INVERSION OF ELECTROMAGNETIC DATA

摘要

Methods and systems in accordance with this invention perform three-dimensional inversion of electromagnetic data, such as magnetotelluric ('MT') data and controlled-source electromagnetic ('CSEM') data, and three-dimensional joint inversion of MT and CSEM data. In exemplary embodiments, nonlinear conjugate gradient ('NLCG') methods are used in lieu of iterative, linearized inversion, and line-search and preconditioning techniques are used that accommodate and exploit the structure of the MCSEM and MT problem.