Patent ID: 6321839
Filing Date: 2001-11-27
Classification: E21B,G01V

Abstract:
A subsurface exploration method comprising the steps of:(a) introducing a probe into a borehole in the ground to a subsurface region within said borehole to be investigated;(b) coupling electromagnetic energy into said region to induce emission of electromagnetic radiation from at least one substance in said region;(c) coupling electromagnetic energy of the electromagnetic radiation emitted by said substance out of said region, at least one of the steps of coupling electromagnetic energy into said region and of coupling electromagnetic energy out of said region being effected at a plurality of locations within said borehole in said region;(d) determining a concentration of said substance from the electromagnetic energy coupled out of said region; and(e) determining a location from said plurality of locations within said boreholes at which a detected concentration of said substance occurs.