Semi-analytical logs of electrical focusing tools in basic subsurface models

This work presents a procedure to obtain synthetic logs for the electrical tools as LLS, LLD and LL7 in subsurface models: plane-parallel layers and cylindrical shells. The synthetic focusing used to acquire semi-analytical logs is based on the superposition principle applied to all transmitter-receiver pair of electrodes. Forward models can be created for investigations of real electrical resistivity data trough inversion procedures. Also, correction charts can be constructed for these tools or any other similar configuration.