GeoFlowを用いたき裂型貯留層における優先流路分布の評価

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  • Evaluation of a distribution of preferential flow paths in a fractured reservoir using GeoFlow
  • 講演 GeoFlowを用いたき裂型貯留層における優先流路分布の評価
  • コウエン GeoFlow オ モチイタ キレツガタ チョリュウソウ ニ オケル ユウセン リュウロ ブンプ ノ ヒョウカ

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We explore the three-orders-of-magnitude difference in productivity between two wells, observed at the Yufutsu oil/gas field in Hokkaido, Japan. A highly reliable discrete fracture network (DFN) model for this field was previously constructed by integrating 3-D seismic data, well logging data, in-situ stress data, and acoustic emission data during a massive hydraulic injection. However, the huge difference in well productivity was not reproduced even with the highly reliable DFN model. In the present study, different from previous studies, scale-dependent fracture aperture distributions are numerically determined by using pairs of fractal fracture surfaces, and given to the critically stressed fractures in the DFN model. For this DFN model with the aperture distributions, fluid flow simulations are conducted by using a novel simulator, GeoFlow, which has been recently developed by the authors to predict the 3-D channeling flow (formation of preferential flow paths) in a rock fracture network. In the GeoFlow simulations, the huge difference in well productivity, which is never reproduced by conventional DFN simulations with the parallel plate model for fracture flow, is successfully reproduced. It is indicated that, in reality, fluid flow within a fractured reservoir is much more localized than a prediction by the conventional DFN simulation, due to the formation of preferential flow paths, which is likely to impact well productivity. It is therefore desirable to evaluate a distribution of preferential flow paths in a fractured reservoir with the concept of GeoFlow.

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