Abstract

The quantitative application of radioactivity logs for the estimation of formation petrophysical properties is dependent on certain fundamental factors which are discussed. It is difficult to avoid "hybrid" combinations of processes; for example neutron-neutron and neutron-gamma effects together; however, it is believed that the future of quantitative application of neutron logs depends to a large extent on the development of single component logging processes. Positive location of the sonde within the borehole for all types of logs needs further development. These improvements plus future developments in gamma-ray spectral logs, neutron-gamma spectral logs, neutron activation logs, and neutron inelastic scattering logs promise a bright future for radioactivity logging.

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