Abstract
Abstract Oil-base drilling fluid density changes considerably with temperature and pressure. Significant density changes prevailing in oil-base drilling fluids can seriously affect the neutron and density sonde readings. The effects of oil-base muds on these logs are discussed, and a technique to account for such effects is proposed. A new approach for true porosity determination in gas-bearing formations is also presented for cases where the gas is miscible with the invading fluid. Two well examples representing different lithologies, fluid types, and miscibility conditions are presented. These examples confirm the need for the proposed corrections and their drastic impact on the qualitative and quantitative interpretation of neutron and density logs.
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