A Rapid and Efficient Methodology to Convert Fractured Reservoir Images Into a Dual-Porosity Model

Abstract : Both characterization and dynamic simulation of naturally-fractured reservoirs have benefited from major advances in recent years. However, the reservoir engineer is still faced with the difficulty of parameterizing the dual-porosity model used to represent such reservoirs. In particular, the equivalent fracture permeabilities and the equivalent matrix block dimensions of such a model cannot be easily derived from observation of the complex images of natural fracture networks. This paper describes a novel and systematic methodology to compute these equivalent parameters. The results of its implementation with specially-designed software demonstrate its validity and efficiency in dealing with field situations. A tensor of equivalent fracture permeability is derived from single-phase steady-state flow computations on the actual fracture network using a 3D resistor network method and specific boundary conditions. The equivalent block dimensions in each layer are derived from the rapid identification of a geometrical function based on capillary imbibition. The methodology was validated against fine-grid reference simulations with a conventional reservoir simulator. Then, a complex outcrop image of a sandstone formation was processed for demonstration purposes. This innovative tool enables the reservoir engineer to build a dual-porosity model which best fits the hydraulic behavior of the actual fractured medium.
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B. Bourbiaux, M. C. Cacas, S. Sarda, J. C. Sabathier. A Rapid and Efficient Methodology to Convert Fractured Reservoir Images Into a Dual-Porosity Model. Revue de l'Institut Français du Pétrole, EDP Sciences, 1998, 53 (6), pp.785-799. ⟨10.2516/ogst:1998069⟩. ⟨hal-02079046⟩

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