Nonlinear inversion of the electrode logging measurements in a deviated well

摘要

We develop a nonlinear inversion method for recon- structing the 3-D electrical conductivity in a highly de- viated well with invasion using electrode logging (static field) measurements. The integral equation is formulated in an oblique polar coordinate system so that the dipping- bed environment can be modeled without approxima- tions. The computation time is dramatically reduced by using a nonuniform discretization grid in the direction away from the borehole.