Progress in the HDR/HWR projects at Tohoku University, Japan

This paper presents an outline of the series of HDR/HWR projects conducted by Tohoku University since 1983, starting with the Gamma-project, which was followed by the HWR, Fractal and MTC projects. The final goal of these pro jects is to establish/develop the design methodology for engineered geother mal reservoirs. A brief review of each project is also presented, with emph asis upon the progress of the main research topics, such as monitoring of r eservoirs by active/passive acoustic techniques, rock mass properties, in s itu stress, modeling and simulation and water/rock chemical interaction. (C ) 1999 CNR. Published by Elsevier Science Ltd. All rights reserved.