地熱エネルギー抽出のために地下岩体中に作成された人工き裂からの逸水量の評価

概要

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The extraction of heat energy from hot dry rock masses in the earth's crust has received wide attention. In the geothermal energy extraction system of this type, heat energy is recovered by circulating water through artificial cracks created in the hot dry rock masses. The present paper is concerned with the theoretical evaluation of water loss through a prefractured plane intersecting an artificial crack. Firstly we derive the equation of continuity in terms of the water pressure in the prefractured plane and the aperture. By solving the equation by means of the difference method, the influences of the tectonic stress, water pressure in the artificial crack and topography of the fracture surfaces on the water loss from the artificial crack are evaluated for no heat extraction. Secondly we discuss the water loss during heat extraction. It is found that the influence of the heat extraction on the water loss is negligibly small.
一般社団法人日本機械学会の論文
1988-02-25