A. Tripp¹, E. Cherkaev²

(1) Univ. of Utah, Salt Lake City, UT
(2) U. of Utah, Salt Lake City, UT

ABSTRACT: High Resolution EM for Petrophysical Characterization

Traditional formation evaluation using electromagnetics has used various assumptions, such as formation conductivity isotropy and the division of the formation into discrete layers. New applications of logging, such as evaluating CO2 geological sequestration sites, may require resolution of formation pore structure which is unattainable today - particularly since CO2 sequestration will involve multiphase fluid. In these cases, simplifications may involve ignoring important information.

We suggest that EM formation evaluation needs to consider formation anisotropy and the random nature of the formation conductivity. The standard approach of correlating formation permeability with porosity - as derived for example from EM logs - is profoundly affected by including these features in a formation evaluation.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado