Hydrocarbon prospecting in deepwater Trinidad using AVO and spectral decomposition ///

The use of Amplitude Versus Offset (AVO) and Spectral Decomposition (SD) techniques for direct hydrocarbon identification in the Plio-Pleistocene section of deepwater areas near Trinidad and Tobago can help to better quantify risk during hydrocarbon prospecting. These seismic technologies require the use of pre-stack and post-stack seismic data that has been processed to preserve relative amplitude and frequency spectrum. To understand and predict the seismic response for different fluid types and lithologies, AVO and SD modeling based on existing well log information close to the study area was performed. The controlled synthetic models simulated the seismic response for wet sands, commercially saturated gas sands and partially saturated gas sands, as well as variations due to lithology. The fluid substitution was performed using Gassman’s equation after proper petrophysical analysis and invasion/dispersion corrections were done on the well data.

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