METHOD OF PROCESSING DATA FROM A DUAL DETECTOR LWD DENSITY LOGGING INSTRUMENT COUPLED WITH AN ACOUSTIC STANDOFF MEASUREMENT

摘要

A logging-while-drilling density sensor includes a gamma ray source and at least two Nal detectors spaced apart from the source for determining measurements indicative of the formation density. An acoustic caliper is use d for making standoff measurements of the Nal detectors. Measurements made by the detectors are partitioned into standoff bins. An adaptive spine and rib method uses the standoff measurements to obtain density estimates. The metho d of the invention may also be used with neutron porosity logging devices.