To compensate for the reduced number of vibrators per shot point required by reductions in group interval and array size, either the recording time per surface unit must be increased or high order simultaneous recording techniques such as the slip sweep technique should be used. Yet these techniques suffer from distortion, which contaminates the data in proportion to the productivity increase generated. A method to significantly reduce this contamination is presented. .
A permanent system of reservoir monitoring has been installed on a gas storage field belonging to Gaz de France in the west of Paris. Because of the nature of the reservoir and the small saturation changes, the expected 4D seismic signal is extremely low. A new processing method taking advantage of the high temporal data redundancy is presented.
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