Regional stress distribution to help with locating exploration areas

Abstract

In this paper, we build a 3D stress model of a region in the Upper Rhine Graben. The model relies on a mechanical code based on the Distinct Element Method (3DECTM) which allows taking multiple fault zones into account. Under the influence of the fault network, horizontal stress redistributions occur within the rock mass and result in areas of greater or lesser compression. In addition, the dilatant nature of the fault zones is reproduced by the chosen law of behavior, and causes the opening of the faults under shearing. The ultimate goal of the model is to improve the exploration phase for deep seated geothermal systems by highlighting areas where the mechanical conditions favor the presence of geothermal resources. To achieve this goal, the model needs to be further tested regarding its assumptions on the geometry, mechanical behavior, boundary conditions and initial state.