Petrophysical Joint Inversion - Squeezing the Value Out of CSEM

Summary The focus of this work is the introduction of a new Petrophysical Joint Inversion (PJI) to drastically improve reservoir characterization through a more robust petrophysical model that makes full use of the complementary information contained in multi-physics data such as seismic and Controlled Source ElectroMagnetics (CSEM). The advent of CSEM brings the possibility of integrating resistivity within the characterization workflow and reveals the potential to significantly improve the accuracy with which reservoir properties in general, and saturation in particular, can be determined. To reconcile the resistive anomalies at the reservoir scale, a 3D CSEM ‘localized’ model-based inversion is applied, capable of quantitatively reconstruct improved-resolution resistivities contained within the seismically derived vertical and lateral reservoir boundaries. Through a case study, based on a deep water oil field offshore Brazil, we demonstrate the power of PJI in the retrieval of reservoir parameters and to augment the certainty with which reservoir lithology and fluid properties are constrained.