API UNIT CALIBRATION OF GAMMA RAY LOGGING TOOLS USING SIMULATED DATA

摘要

Gamma ray logging tools are calibrated using gamma emissions data simulated using Monte Carlo modeling techniques. During the simulation, one or more nuclear activity zones of a formation are modeled and photon counting rates are determined. Using the simulated counting rates, an American Petroleum Institute ("API") unit sensitivity factor is calculated. The API unit sensitivity factor is then applied to convert real logging tool counting responses into API units.