Rock Physics Modelling of Stress Sensitivity in Patchy Cemented Sandstones

We demonstrate how to characterize and model the effects of heterogenous grain contacts and associated stress sensitivity in reservoir sandstones. We use nested Hashin-Shtrikman modeling, where we first mix loose sands and cemented sandstones to create a patchy cemented high-porosity end-member. Next, we use Hashin-Shtrikman modeling to account for porosity variation between high porosity end-member and mineral point. This approach enable us to honor stress sensitivity in the patchy cemented sandstones, as the loose grain contacts will behave according to Hertzian contact theory. This approach can be used to quantify stress sensitivity in reservoir sandstones where core samples are lacking or inreliable. Future research will focus on validating this approach on real data.