A finite element method for the solution of Poisson's equation has been used to simulate the axisymmetric spatial distribution of the SP under various borehole and formation conditions. The SP vertical profiles calculated in this manner on the hole axis are compared with previous results obtained on a Resistor Network analog computer and extended to more complicated geometry. A deconvolution technique based on the solution to the forward problem has been optimized for the SP log in synergy with the resistivity profile derived from the new Phasor2 induction tool and a precise delineation of the reservoir boundaries from microdevices. Examples of improvements in interpreting Gulf Coast shaly sand reservoirs are presented.

This content is only available via PDF.
You can access this article if you purchase or spend a download.