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Naturally fractured reservoir modeling using static and dynamic data.

2003; Japanese Association for Petroleum Engineers; Volume: 68; Issue: 6 Linguagem: Inglês

10.3720/japt.68.479

1881-4131

Tatsuhiko Matsuura, Kazuhiko Tezuka, Tetsuya Tamagawa,

Hydraulic Fracturing and Reservoir Analysis

Yufutsu field is located in the southern Ishikari Plain, central Hokkaido, in northern Japan. Japex commenced the production in 1996 and is producing gas and condensate. The reservoir is a naturally fractured granite and conglomerate. The permeability and porosity is very low. The reservoir is so heterogeneous that it cannot be modeled with the conventional method. We modeled it with the discrete fracture network (DFN) model by using the statistical properties of the fractures extracted from static data such as borehole images.The borehole images show that the fractures can be divided into two families according to the nature. One includes fractures of wide apertures. This family keeps a clear tendency of the azimuth and dip. The other includes narrow aperture fractures whose azimuth and dip are more scattered. Two sets of DFN model were made and merged to one model to make an overall DFN model.The model was calibrated successfully with the dynamic data such as pressure buildup data and production history. The pressure buildup data were used for the calibration of fracture properties and the production history were used for the calibration of spatial distribution of fractures.