Well performance diagnostics by integrating 4D seismic in a coupled fluid flow / geomechanical model

In this paper we present an integrated workflow for modeling and monitoring geomechanical effects in and around a producing reservoir stimulated by injection. The novelty of the workflow is the updates of a coupled fluid flow / geomechanical model based on time-lapse seismic measurements. We here take advantage of new methods for measuring subtle time-shifts and new techniques for detecting (active) fracture sets on 4D seismic. The model calibration step includes dynamic permeability updates, which extend the permitted region of flow to the overburden to facilitate a situation where fluids escape from the reservoir. The extended model gives a first order estimate of the amount of escaped fluids. The presented results are from a reservoir where the cap rock seal was compromised after injecting at high pressure.