Patent ID: 6766256
Filing Date: 2004-07-20
Classification: G01V

Abstract:
A method of processing seismic data, said seismic data having been obtained by steps comprising:performing a plurality of sweeps, wherein each sweep comprises generating seismic signals in the earth using a plurality of vibrators by applying a pilot sweep waveform to each vibrator, each pilot sweep being a waveform of changing frequency; measuring the force applied to the earth by each vibrator to determine a measured force waveform; and measuring the seismic signals at one or more locations remote from the vibrators; filtering the measured force waveform to remove harmonics of the pilot sweep from the measured force waveform and thus determining a filtered force waveform; generating an inversion operator from the filtered force waveform for each vibrator; and applying said inversion operator to the measured seismic signals to determine the contribution of each vibrator to the seismic signals.