2.5D direct-current resistivity forward modelling and inversion by finite-element–infinite-element coupled method

Release time:2016-04-26

Journal:Geophysical Prospecting

Abstract:To reduce the numerical errors arising from the improper enforcement of the artificial boundary conditions on the distant surface that encloses the underground part of the subsurface, we present a finite-element–infinite-element coupled method to significantly reduce the computation time and memory cost in the 2.5D direct-current resistivity inversion. We first present the boundary value problem of the secondary potential. Then, a new type of infinite element is analysed and applied to replace the conventionally used mixed boundary condition on the distant boundary.

Document Type:J

Translation or Not:no

Date of Publication:2015-10-14