Spectrum to Reprocess Seismic Data Off Trinidad and Tobago
Spectrum has signed an agreement with the Ministry of Energy and Energy Affairs (MEEA) to reprocess 12,240 line kilometers of seismic data from the Trinidad and Tobago Deep Atlantic Area (TTDAA) 2D survey situated off the eastern coasts of these two islands. The data is being processed under the agreement in preparation for a Competitive Bid Round in the Deep Atlantic area.
There are 39 blocks delineated in water depths between 1,000 – 3,500 meters. A decision is expected soon from the MEEA as to the number of blocks that will be included in the competitive bid round which was derived in part by a consultation or nomination process held by the MEEA.
The primary aim of Spectrum's reprocessing will be to de-risk the deep/ultra deep play targets that may be considered high risk by prospective exploration companies. Improvements in imaging 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.
The main advances in the re-processing sequence are in the application of Surface-Related Multiple Elimination (SRME) and enhanced high resolution Radon demultiple techniques. 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. Two passes of Kirchhoff pre-stack time migration have provided better resolution of deeper structures.
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