Patent ID: 6269310
Filing Date: 2001-07-31
Classification: G01V

Abstract:
A method for processing crosswell seismic data from a region of the earth's subsurface generated by transmitting a seismic signal from a plurality of source positions within at least one borehole within said region and detecting said seismic signal at a plurality of receiver positions in at least one borehole within said region, comprising:utilizing said seismic data to develop a model of raypaths traveled by seismic signals from said source positions to said receiver positions;evaluating said raypaths to determine if the seismic signal traveling along said raypaths traveled as a headwave for at least a part of the transmission path between the source position and the receiver position;deleting from said model of raypaths the raypaths along which said seismic signal traveled as headwaves; andpreparing a profile representing a property of said region of the earth's subsurface utilizing said model of raypaths from which the raypaths along which said seismic signal traveled as headwaves have been substantially deleted.