Abstract
The development of marine reflection methods over the past few years has shown the technical and economic advantages that can be derived from highly repetitive nonexplosive sources. Pursuing the idea to its limits the Geophyiscal Division of SNPA’s Research Center has designed and implemented a new seismic method. The source energy is released into the water in the form of discrete pulses of the same sign and essentially the same amplitude, according to a long pseudo‐random sequence. This process is not restricted to any particular source; it can be used with a number of different sources, provided they can reach a sufficient rate of repetition. The basic principle has been checked with a sparker, chosen for its flexibility; however, conventional sources such as air and steam guns were also tested. Comparison section indicate improved quality for the new method due to multiplication of seismic ray paths and a more adequate frequency spectrum. Additional benefits are maximum flexibility in recording and processing and reduction of costs.
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