METHOD FOR DETERMINING FLUID TYPE AND LITHOLOGY OF SUBTERRANEAN FORMATIONS

摘要

ABSTRACT OF THE DISCLOSUREDisclosed herein in a method for determining the lithology of andthe types of fluid contained within a subterranean formation. In the prac-tice of this invention, high energy neutrons bombard the formation matrixand formation fluids. Induced gamma rays from inelastic scattering reactionsare indicative of the type of fluid in the formation, and induced gammarays from neutron capture reactions are indicative of the lithology of theformation matrix. Among other things, this technique permits differentia-tion between water-saturated limestones and oil-bearing sandstones. Alsodisclosed herein is a method for detecting the presence of natural gas withina subterranean formation.