Patent ID: 6021090
Filing Date: 2000-02-01
Classification: G01V

Abstract:
A computer-aided method, comprising:(a) receiving a plurality of multi-component seismic signals from corresponding multi-component receivers resting at a bottom of a body of water following insonification from a plurality of source locations, the signals being formatted in the time domain as common-trace gathers of in-line, cross-line, vertical and pressure signal components;(b) transforming the respective gathers from the time domain to the frequency domain;(c) for each frequency of interest, generating cross-line and vertical coupling coefficients by minimizing, in a least-square sense, the sum of a selected subset of the in-line, cross-line and vertical signal components;(d) using the so-generated cross-line and vertical coupling coefficients, calculating corrected cross-line responses over all travel times and shots;(e) for each frequency of interest, generating a second cross-line coupling coefficient by minimizing, in a least square sense, the sum of a subset of the vertical signal components and the corrected cross-line responses;(f) using the second cross-line coupling coefficients, calculating partially corrected vertical responses over all travel times, shots and receivers;(g) for each frequency of interest, generating a second vertical coupling coefficient by minimizing in a least-squares sense, a subst of the partially-corrected vertical response and the pressure signal components;(h) using the second vertical coupling coefficient, calculating the fully corrected vertical responses for all travel times, shots, and receivers;(i) transforming the in-line, corrected cross-line, corrected vertical and pressure signal components from the frequency domain to the time domain; and(j) storing the so-transformed signal components in a computer memory for use in further processing to display a model of a volume of the earth's subsurface in a desired manner.