Patent ID: 6584837
Filing Date: 2003-07-01
Classification: G01V

Abstract:
A method of logging of an earth formation comprising:(a) conveying a logging tool into a borehole in the earth formation and rotating the tool therein; (b) making a plurality of long spaced (LS) and short spaced (SS) measurements of a parameter of interest of the earth formation using nuclear sensors on the logging tool over a time interval during continuing rotation of the tool; (c) determining a standoff associated with each of said LS and SS measurements; (d) determining an azimuth associated with each of said LS and SS measurements; (e) defining a plurality of azimuthal sectors around said logging tool; and (f) determining from said plurality of LS and SS measurements and their associated standoff and azimuth, an azimuthal bulk density corresponding to each of said plurality of sectors, said azimuthal bulk density corrected for standoff using a correction determined at least in part by said standoff.