Interpretation: SEG 6 (2):SD115-SD128 (2018)

We have evaluated a case study, in which a class-1 amplitude variation with offset turbiditic system located offshore Cote d’Ivoire, West Africa, is characterized in terms of rock properties and stratigraphic elements using well-log and prestack seismic data. The methodology applied involves the conditioning and modeling of well-log data to several plausible geologic scenarios at the prospect location, the conditioning and inversion of prestack seismic data for P- and S-wave impedance estimation, and the quantitative estimation of rock property volumes and their geologic interpretation. The approaches used for the quantitative interpretation of these rock properties were the multiattribute rotation scheme for lithology and porosity characterization and a Bayesian lithofluid facies classification for a probabilistic evaluation of fluid content. The result indicates how the application and integration of these different AVO- and rock-physics-based reservoir characterization workflows help us to understand key geologic stratigraphic elements of the architecture of the turbidite system and its static petrophysical characteristics. Furthermore, we found out how to quantify and interpret the risk related to the probability of finding hydrocarbon in a class-1 AVO setting using seismically derived elastic attributes, which are characterized by having a small level of sensitivity to changes in fluid saturation.
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DOI 10.1190/int-2017-0163.1
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