3D Seismic Constraint Definition in Deep-Offshore Turbidite Reservoir

Abstract : Girassol is a turbidite field located in deep offshore Angola. This field is particularly challenging in terms of reservoir characterization due to the high complexity of reservoir geology (channel-levees complexes eroding themselves partially). However, by integrating properly the high resolution 3D pre-stack seismic with well data, seismic velocities, stratigraphy and structural information, extraction of a quantitative 3D high resolution geological information becomes possible. The proposed workflow is divided into three parts: – pre-stack stratigraphic inversion, to estimate 3D acoustic and shear impedance model explaining optimally available seismic data: probabilistic seismic facies analysis from the inversion results based on a discriminant analysis technique; – geological facies proportions computation from the previous step results by a novel approach developed to account for scale differences between seismic facies and detailed geological facies, in order to extract information at the geological scale, and infer the small heterogeneities. As a result, we obtain a set of 3D geological facies average proportion volumes, which can be used in, a further step to better constrain geological modelling.
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P. Nivlet, F. Lefeuvre, J. L. Piazza. 3D Seismic Constraint Definition in Deep-Offshore Turbidite Reservoir. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2007, 62 (2), pp.249-264. ⟨10.2516/ogst:2007021⟩. ⟨hal-02005645⟩

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