Abstract
In this work we report the outcome of the activities carried out in the context of the SECURe project for task 4.2.3, on coupling the local to the global geomechanical characterization of subsurface reservoirs. The theoretical framework for the coupling of geomechanical and flow involving the solutions of the poroelasticity equations is outlined for both the local and field scale.
At the local scale, after a description of the geomechanical system of equations, fully coupled flow and geomechanical simulations in a cylindrical section near a wellbore is carried out. Constant and variable permeability fields near the wellbore are studied to highlight the role of heterogeneities and fractures.
A global geomechanical characterization at the field scale is then performed on the example of the Borzecin structure in Poland that is used for acid gas injection and sequestration (see SECURe project deliverable 2.2 for an overview of this site). To this aim, a geological and geomechanical model of the structure is constructed to include its extended neighbourhood comprising large zones of the structure overburden, underburden and sideburden. Coupled dynamical, flow and geomechanical simulations are performed using an effective method of continuous coupling inferred from discrete, iterated coupling. The models are calibrated based on the long history of the structure operation as a sequestration site to provide a reliable reservoir model characterization.
Based on the field scale coupled reservoir-geomechanical modelling results, rock physics models were used to calculate the elastic parameters (Vp, Vs, and density) that are the observables effecting the seismic response.
We also investigate the applicability of the multi-rate mass transfer (MRMT) framework to the Borzecin reservoir to model unresolved heterogeneities and predict leakage over a long period of time.
At the local scale, after a description of the geomechanical system of equations, fully coupled flow and geomechanical simulations in a cylindrical section near a wellbore is carried out. Constant and variable permeability fields near the wellbore are studied to highlight the role of heterogeneities and fractures.
A global geomechanical characterization at the field scale is then performed on the example of the Borzecin structure in Poland that is used for acid gas injection and sequestration (see SECURe project deliverable 2.2 for an overview of this site). To this aim, a geological and geomechanical model of the structure is constructed to include its extended neighbourhood comprising large zones of the structure overburden, underburden and sideburden. Coupled dynamical, flow and geomechanical simulations are performed using an effective method of continuous coupling inferred from discrete, iterated coupling. The models are calibrated based on the long history of the structure operation as a sequestration site to provide a reliable reservoir model characterization.
Based on the field scale coupled reservoir-geomechanical modelling results, rock physics models were used to calculate the elastic parameters (Vp, Vs, and density) that are the observables effecting the seismic response.
We also investigate the applicability of the multi-rate mass transfer (MRMT) framework to the Borzecin reservoir to model unresolved heterogeneities and predict leakage over a long period of time.