Closing the loops using engineering-consistent 4D seismic inversion

Abstract

An updating strategy is designed to iteratively close the loop among fluid-flow simulation predictions and measured production history, predicted and observed 4D seismic data, and finally predicted and inverted impedance/impedance changes. The central ingredient in this scheme is the inversion to elastic property changes from the seismic in an engineering-consistent manner. The geometry, volumetrics, and transmissibility multipliers for the reservoir model are updated in three successive stages, and success is monitored by a comparison between the seismic and fluid-flow domains. The workflow is implemented on a West African field, where reservoir model improvements are obtained in combination with a consistency among model, impedance, and seismic domains.

An Engineering-consistent Bayesian Scheme for 4D Seismic to Simulator Inversion

“…In order to span the lifecycle of a brownfield reservoir, the integration of reservoir simulation and seismic surveillance must be continuous, in which the mismatch between each data domain is progressively reduced by collaboratively closing the loops (Tian and MacBeth, 2014). These loops are closed by comparing the simulator-to-seismic (sim2seis) forward modelling with the seismic-tosimulator (seis2sim) inversion results.…”