Numerical simulation of reservoir pressure distribution in fractured reservoirs taking into account the storage and transmissibility properties of the matrix and fractures

Abstract

The development of carbonate reservoirs differs significantly from that of terrigenous reservoirs due to their geological structure and the presence of a developed fracture system. This study demonstrates the necessity of applying non-standard methods to monitor the energy state of such reservoirs. A reservoir pressure field was calculated using a Discrete Fracture Network (DFN) model. A series of numerical experiments were conducted for various values of the fracture-matrix permeability ratio (kf/km) and the fracture-matrix volume ratio (Vf/Vm). It was established that the permeability ratio acts as a regulator of the degree of heterogeneity in reservoir depletion. Within the framework of the developed model, threshold values of the parameters were determined: at kf/km < 20, the system behaves as a quasi-homogeneous medium; at 20 ≤ kf/km ≤ 105, a dual porosity and dual permeability regime is realized; and at kf/km > 105, fracture-dominated flow prevails. The obtained results can be used for the rapid assessment of reservoir type at the early stages of field development. doi 10.33184/bulletin-bsu-2026.2.2