Abstract
Reservoir characterization is a keyword common to geologists, geophysicists and reservoir engineers. It needs inversion analysis through human knowledge and/or mathematical methods. Comparing types of inversion work routinely done by “-ists” and “-ers”, the author refers to AHM (automatic history matching) technique, viewing from its current and future potential, and proposes MWO (Monitoring While Operation) concept which might be effective for realizing good quality of reservoir characterization.