Spectrum to reprocess Trinidad and Tobago seismic data
Spectrum has agreed to reprocess 12,240 line km (7,606 mi) of 2D seismic data from the Trinidad and Tobago Deep Atlantic Area survey east of the islands.
LONDON – Spectrum has agreed to reprocess 12,240 line km (7,606 mi) of 2D seismic data from the Trinidad and Tobago Deep Atlantic Area survey east of the islands. The work is being done for the Ministry of Energy and Energy Affairs in preparation for a round of bidding in the area.
Spectrum says 39 blocks in water depths from 1,000 to 3,500 m (3,280 to 11,483 ft) are involved, although no decision has been made as to the number of blocks to be included in the bidding. The re-processed images will enable data ties into the shallow play area and provide key control allowing extrapolation of successful shallow plays types as well as new plays into the deep/ultra-deep area, says Spectrum.
Specific work included in the re-processing sequence are in the application of Surface-Related Multiple Elimination (SRME) and enhanced high resolution Radon demultiples. Much improvement in the imaging has been gained by careful velocity modeling, taking into account the significant geological changes from shallow to deep water areas and allowing the identification of a slower deep velocity trend previously removed by an aggressive demultiple operator, says Spectrum. Two passes of Kirchhoff pre-stack time migration give better resolution of deeper structures.