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• W2023277814 abstract "Abstract Amplitude versus offset (AVO) and spectral decomposition (SD) techniques were used for direct hydrocarbon identification (DHI) in the Plio-pleistocene section in Deep Water Trinidad & Tobago to help to quantify better the risk during hydrocarbon prospecting. In order 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 were 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. After modeling and validation of the technique with real pre-stack and post-stack seismic data on calibration well locations, seismic analysis supported with AVO and SD technologies was performed to evaluate prospects located in Deep Water in Trinidad & Tobago. Very subtle differences in the AVO and SD responses were the only way to discriminate between hydrocarbon and lithology. Very subtle variations during AVO and SD analysis suggest that the lithology factor can produce false DHI in the area. SD also showed the potential of helping separate fully saturated gas sands from partially saturated gas sands. Introduction The use of amplitude versus offset (AVO) and spectral decomposition (SD) techniques for direct hydrocarbon identification (DHI) in the Plio-pleistocene section in Deep Water Trinidad & Tobago can help to quantify better the risk during hydrocarbon prospecting. These seismic technologies require the use of pre-stack and post-stack seismic data that has been processed for preserving relative amplitude and frequency spectrum. In order 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. Petrophysics and Fluid Replacement Invasion and dispersion corrections were applied to the well log data previous to fluid replacement. Fluid replacement was performed using Gassman's equation to simulate the fluid and saturation effect on the well log response on the P-Wave Velocity, Density and S-Wave Velocity due to the presence of brine, partially saturated and full gas sand cases. The resultant fluid replacement log responses are shown in figure 1. Figure 2 shows a sketch of the expected response for P-Wave Velocity, Density, S-Wave Velocity, Poisson Ratio and Acoustic Impedance for the same fluid cases." @default.
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• W2023277814 date "2009-05-04" @default.
• W2023277814 modified "2023-09-27" @default.
• W2023277814 title "Prospect Exploration Risking Using Modern Geophysical Technology" @default.
• W2023277814 doi "https://doi.org/10.4043/19984-ms" @default.
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