能動型地熱エネルギ抽出のための不均質アスペリティ分布を考慮した水圧破砕誘起せん断破壊挙動の評価

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  • Evaluation of hydraulic stimulation-induced shear fracture considering inhomogeneous asperity distribution for enhanced geothermal systems

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<p>This paper presents a new numerical simulation model for hydraulic injection to deep underground. For deep underground exploitation, hydraulic injection is used to enhance the permeability of the formation and produce engineered reservoirs. Especially in geothermal energy exploitation, there are many sites that underground permeability is too low although rock's temperature is high enough. Hydraulic injection is useful to enhance rock's permeability between injection well and production well. However, during injection, earthquakes can be induced so it is necessary to reduce the risk of it. For continuous exploitation, it is necessary to solve shear destruction behavior of fractures. In this research, we develop the reservoir model that consider only one vertical fracture based on the acoustic emission result that seismic centers were localized on one plane. This model considers reservoir creation by shear dilation, and supposes existence of asperities on fracture that cause earthquake when they break. Using this reservoir model, we can analyze time dependent earthquake occurrence and reservoir creation behavior.</p>

収録刊行物

  • 年次大会

    年次大会 2017 (0), G0300605-, 2017

    一般社団法人 日本機械学会

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