SUPPRESSION OF MULTIPLE THOUGHTS IN MARINE SEISMIC EXPLORATION TECHNIQUES USING LONG SOURCE AND DETECTOR CHAINS

摘要

The invention relates to techniques for marine seismic reflection by reflection, and in particular the reduction of the effect of multiple reflections. /P P The method of the invention is based on the use of two chains of seismic sources 16-19 towed behind a ship 11 which also drags a chain of hydrophones 22. By lengthening or shortening the one of the source chains without varying the total number of sources, the effective length of the composite chain can be adjusted so as to optimize the suppression of the multiple reflection signals by normal discrimination between the propagation delays. The seismograms thus obtained can then be subjected to conventional treatments for improving their signal / noise ratio.