Now, you can relate reservoir simulation results directly to seismic properties as part of an end-to-end workflow. Starting with the Nexus® 5000.4.12 release, petro-elastic modeling (PEM) capabilities have been added to enable the closed-loop estimation of multiple 3D seismic properties, such as acoustic impedance, Vp/Vs, saturated bulk modulus and Poisson’s ratio for each gridblock in a single porosity reservoir. These capabilities enable multi-disciplinary 4D workflows, which link numerical flow response with acquired time-lapse seismic. In addition to petrophysical property models (porosity and permeability), you’ll need three dry rock properties: bulk modulus, shear modulus and mineral density, all of which can be computed in DecisionSpace® Earth Modeling. It’s that simple!
All of the estimated seismic properties computed by Nexus® are stored in the same data repository (.vdb) as your other simulation results, such as pressure and saturations, and you have complete control over the output frequency of the seismic properties. You can request output only when acquired time-lapse seismic exists, or at intermediate times to estimate seismic properties between surveys. This solution enables easy access to simulator computed seismic properties, and direct comparison of these with inverted seismic properties that have been blocked to the 3D geocellular grid; thereby, achieving closed-loop integration.
Unlike other PEM solutions, the Nexus® solution does not require post-processing calculations to compute petro-elastic outputs, resulting in significant time saving and multidisciplinary workflow continuity.