Patent ID: 9360585
Filing Date: 2016-06-07
CPC Classification: E21B,G01N,G01V

Claim Text:
1. A method for estimating formation porosity from a neutron logging measurement, the method comprising: (a) acquiring a neutron logging data point including a near detector count rate in a formation and a far detector count rate in the formation, wherein the neutron logging data point comprises average near detector count rates and average far detector count rates, the average near count rates and the average far detector count rates obtained by averaging near and far detector counts over a time period greater than or equal to a rotational period of a logging tool in a borehole; (b) acquiring input data, the input data relating near count rate, far count rate, and formation porosity in a region of interest, wherein the region of interest comprises a predetermined range of borehole diameter and a predetermined range of sensor standoff; and (c) causing a processor to process the data point acquired in (a) and the input data acquired in (b) to obtain a borehole independent formation porosity measurement, wherein the porosity measurement is substantially independent of borehole diameter, borehole shape and sensor standoff; and (d) continuing hydrocarbon exploration and/or hydrocarbon production based on the porosity measurement.