Exploration and development in the Okuaizu Geothermal Field, Japan
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概要
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The Okuaizu geothermal field is located in the western part of the Aizu district, Fukushima prefecture, northeast Japan. A geothermal investigation in the area was commenced by Mitsui, Mining and Smelting Co., Ltd.(MMS) in 1974. The Okuaizu Geothermal Co., Ltd.(OAG), a subsidiary company of MMS, Mitsui Construction Co., Ltd. and Toshiba Corporation, took over this exploration in 1983.<BR>OAG has drilled fourteen production wells and three reinjection wells so far. The production zone of the field is formed by two fault systems, Chinoikezawa fault system and Sarukurazawa fault system. The reinjection zone is in the Oizawa fault system. These three fault systems have NW-SE strikes and are steeply dipping to NE. The Production wells are drilled by positive displacement control drilling to get many feed points in these declined faults. Major feed points are at a depth from 1, 000 to 2, 600m. The formation temperature at these depths is 200 to 350°C. Geothermal reservoirs governed by these fault systems are estimated to have a potencial to continue supplying steam to a 75MWe power station for 30 years. The production wells produce steam and water mixture. The steam is separated and supplied to a 65MWe power station. The commercial operation of power station began in May, 1995 and is operated by Tohoku Electric Power Co., Inc. An operational peculiarity in the Okuaizu field is that separated water containing dissolved silica is diluted with the overflow water from the cooling tower of power station before reinjection to avoid the scaling problem in the reinjection wells.
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