Optimization of Impulse Response for Borehole Gamma Ray Logging

Abstract

The gamma-ray borehole logging plays a leading role in uranium exploration programs and more so in the estimation of the geological impulse response function in gamma ray intensity which is solely responsible to delineate the radioactive horizons. In the past several attempts have been made to estimate this function numerically, theoretically and heuristically too based on the controlled experiments.

However, the present work is an attempt to determine / estimate this geological function by directly using the data of radioactive borehole logging. It is interesting to note in this study that the results obtained by this approach are not only nearer to the results obtained by the earlier attempts but also encourage to study further in detail under different geological formations. The present work is based on the gamma-ray borehole logging data of Yellapur area, Nalgonda dist., A.P, India, for the estimation of the geological function.

Keywords: Gamma ray logging, uranium exploration, geological response, radioactive zones, exponential behavior, geological formations, exponential integral of first kind, Bessel Functions of first and second kind, gamma ray probe, gamma ray transport theory, field measurements