A new resolution enhancement method for neutron porosity tools

The effectiveness of a new resolution enhancement method for compensated neutron porosity logs is illustrated. The proposed method is the same as conventional ratio processing except that a smaller amount of depth shifting is used. Simulated log data are used to show that this method increases the vertical resolution by a factor of two: the vertical resolution obtained with conventional processing is about 2 1/2 ft; with the present method the vertical resolution is approximately 1 ft. This method is compared with a resolution enhancement method proposed by J.E. Galford et al. (1986) in which the log response is sharpened by obtaining the porosity from the near detector count rate instead of the ratio between near and far detector count rates. The present method produces similar results but is simpler to implement