- 1Department of Reservoir Technology, Institute for Energy Technology, Kjeller, Norway (daniel.kiss@ife.no)
- 2Department of Geosciences, University of Oslo, Oslo, Norway
A key effort in geodynamics is to understand the interplay between localized porous fluid flow and rock deformation. Our primary focus is exploring the effect of brittle deformation and consequent dynamic permeability evolution on localized fluid migration pathways. Such processes are well documented in sedimentary reservoirs and in magmatic systems. The most critical applications include induced seismicity, fault reactivation and associated integrity of cap rocks in siliciclastic reservoirs and dike and sill emplacement with associated seismicity in magmatic systems.
In our models we consider fluid flow in a deformable porous medium. The governing equations are derived from the conservation of mass and momentum in two phases. One phase represents the solid skeleton, which deforms in a poro-(visco-)elasto-plastic manner. The second phase represents low viscosity fluid (water, CH, melt), percolating through the solid skeleton, that is described by Darcy’s law. A special process we will investigate is brittle failure of the matrix due to high fluid pressure (hydro-fracturing, fault reactivation, diking). The system of equations is solved numerically, using the pseudo transient method, that is well suited to solve highly non-linear problems, as solving the global equations and iterating the non-linearities can be done at the same time. Moreover, the algorithm requires large number of local and cheap operations which is ideal for GPU implementation.
We demonstrate that our newly developed numerical codes can resolve important end-member cases of fluid induced fracturing (mode-1 and mode-2). Furthermore, we extract components of seismic moment tensors from the poro-elasto- plastic geomechanical numerical simulation. This approach bridges geomechanical parameters with seismological observables, providing a promising avenue for a more comprehensive understanding of the progressive deformation associated with fluid migration.
How to cite: Kiss, D., Yarushina, V., and Minakov, A.: Hydromechanical modelling of poro-(visco-)elasto-plastic deformation and fluid flow localization , EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-18320, https://doi.org/10.5194/egusphere-egu25-18320, 2025.