Abstract Understanding resistivity-tool response and resistivity-log interpretation for formation evaluation is vital for the matching of the reconstructed deep-reading resistivity logs with the field log curves. AAPG Archie 2 introduces the fundamental concepts required. Resistivity-logging-tool physics and measurement accuracy are reviewed, and forward- and inverse-modeling resistivity-tool responses are introduced. In the case studies presented, well-deviation, shoulder-bed, bed-thickness, borehole, mud-resistivity, and invasion effects on restivity-log responses are discussed. This volume has been written for geoscientists and engineers working with and interpreting resistivity logs, petrophysicists and reservoir engineers integrating resistivity-based and capillary-pressure-based quantitative calculation of formation water saturation, and formation evaluation specialists.

Abstract “Many siliciclastic oil and gas reservoirs contain significant volumes of recoverable hydrocarbons in intervals whose average bed thickness is below the resolution of conventional well-logging tools. In-place hydrocarbon volumes are difficult to evaluate accurately in these thin-bedded reservoirs. The authors conducted research on thin-bed evaluation methods during the years 1995-1998 and developed a set of methods and practices that have been used worldwide by ExxonMobil since then. The present book describes these methods in the context of an integrated formation evaluation approach for thin-bedded reservoirs. The description is intended to provide useful information for both geoscience generalists and petrophysical specialists.”