Patent ID: 6026057
Filing Date: 2000-02-15
Classification: G01V

Abstract:
A method of operating a computer to correct seismic signals for use in a seismic survey, comprising the steps of:retrieving, from computer memory, data corresponding to a first gather of paired seismic traces, each trace representative of acoustic energy traveling through subsurface geological structures and detected at one of a plurality of receiver locations, each trace in the first gather corresponding to a receiver located at an offset distance, and each pair of traces associated with a common receiver location and including a horizontal trace corresponding to horizontally-sensed energy and a vertical trace corresponding to vertically-sensed energy;estimating, for at least a first reflection event detected in the paired seismic traces for the first gather, a zero-offset directivity value and a directivity slope value;determining, for each of the plurality of paired seismic traces in the first gather, a direction angle from the zero-offset directivity value and the directivity slope value, and from the offset distance of the receiver location associated with the paired seismic traces;generating, for each of the plurality of paired seismic traces in the first gather, a longitudinal seismic trace based upon a combination of the horizontal and vertical seismic traces and the direction angle; andstoring the longitudinal seismic traces in the computer memory.