Fracture Network Modeling of Hijiori Hot Dry Rock Reservoir by Deterministic and Stochastic Crack Network Simulator (D/SC)

Abstract

D/SC (Deterministic / Stochastic Crack network simulator) is a fracture network modeling system with a new technique for building a fracture network by using combined deterministic and stochastic information for the fractures. The basic concept is to put fractures into the model directly if their features have been determined, and to interpolate the space in between by stochastic fractures which follow the statistical properties of the reservoir. The model with a number of discrete fractures is then converted to a continuum mesh whose elements have equivalent permeability to the fracture network. Finally, the pressure and flow vector at every element is calculated. The advantage of this approach is that the various kinds of data obtained from the reservoir can be utilized in describing the characteristics of the reservoir. In this paper, fracture network models for the Hijiori HDR reservoir are investigated by using the D/SC simulator. A comparison of the three types of models gave us several valuable understandings of the D/SC simulator and the Hijiori HDR reservoir.