Integration of Geomechanical Modeling with Microfrac Test Results for In-Situ Stress Calibration in Tight Reservoirs - A Case Study from the Amguid Basin, Eastern Algeria

Abstract This case study employs a systematic 1D geomechanical modelling workflow to constrain the minimum horizontal stress (Shmin) within tight Triassic reservoirs of the Touggourt Field in eastern Algeria. The modelling framework was developed to inform the selection of wireline microfrac test intervals and to support reliable in-situ stress characterization, which is necessary for designing hydraulic-fracture treatments in a high-pressure, low-permeability setting. Pre-job geomechanical modeling guided the test interval selection. Pump-out technique was utilized to address the externally elevated high breakdown pressure. Measured breakdown pressure gradients ranged between 1.04 and 1.1 psi/ft, values that are comparable to or exceed the local vertical stress gradient. Flow-back pressure responses from the competent, stiff Triassic horizons exhibited closure-pressure gradients in the range of 0.88-0.94 psi/ft. Post-job geomechanical model calibration indicated a prevailing strike-slip tectonic stress regime in the study area.