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.
Domains
Physics [physics]
Origin : Publication funded by an institution
Loading...