Abstract
Shot isolation enabled full-fold, multi-source acquisition is achieved by applying the novel technology of signal apparition to the encoding and decoding of fully superimposed shot records from non-distance separated sources. The introduction of periodically varying shot-to-shot modulation functions for encoding injects energy at predetermined positions within distinct wavenumber ranges, which then enables a deterministic decoding of individual shots in data processing. We demonstrate the method for single vessel operations, first on a dual source configuration for seabed acquisition, extracted from the SEG Advanced Modeling Program (SEAM) Phase I dataset, and then extend the methodology to triple-sources through the use of an emulated marine real data example from the North Sea. With shot isolation enabled multi-source acquisition being successfully applied in a marine and seabed seismic context, scope for significant productivity gains is created. Compared to established acquisition techniques, gains arise from the ability to acquire full-fold data in a shorter time frame without compromising the subsurface bin size. For marine seismic acquisition, this also implies that the number of towed streamers can be reduced, giving leeway to additional strategic considerations on subjects such as capital expenditures and the optimization of vessel deployment plans.
Highlights
Shot isolation enabled full-fold, multi-source acquisition is achieved by applying the novel technology of signal apparition to the encoding and decoding of fully superimposed shot records from non-distance separated sources
We demonstrate the method for single vessel operations, first on a dual source configuration for seabed acquisition, extracted from the SEG Advanced Modeling Program (SEAM) Phase I dataset, and extend the methodology to triple-sources through the use of an emulated marine real data example from the North Sea
We have demonstrated on dual- and triple-source synthesized data that the method of signal apparition enables full-fold multi-source acquisition where sources can be towed close together to deliver full-fold data with minimal residuals after shot isolation
Summary
Shot isolation enabled full-fold, multi-source acquisition is achieved by applying the novel technology of signal apparition to the encoding and decoding of fully superimposed shot records from non-distance separated sources. The difference shown in Figure 6j only contains a small amount of residual energy, attributed to steeply dipping events that cannot be accurately isolated by the sorting into COGs and would require a more sophisticated isolation workflow as for example described by Andersson et al (2016) These results are quite encouraging and demonstrate the potential of signal apparition for shot isolation enabled full-fold, multi-source acquisition. For this example, six streamers of 8 km length each were dropped and the streamer separation of the outer three streamers was increased to 200 m. Above all, adding sources allows us to significantly reduce risk exposure and capital expenditure for in-sea equipment whilst enhancing operational flexibility at the same time
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