Determination of In-Situ Stress to Predict Direction of Hydraulically Created Fractures for Development of Hot Dry Rock Geothermal Reservoirs in Japan
- Location
- Yakedake, Japan
- Conference
- Geothermal Resources Council Transactions
- Year
- 1985
- Session
- HDR/EGS; Hydraulic fracturing; Tectonics; Microseismicity
- Language
- English
Abstract
It is very important to know the underground stress state to design and complete a Hot Dry Rock geothermal reservoir because the direction of the hydraulic fractures depends on the earth stress. The hydraulic mini fracturing technique way introduced to determine the in situ stress state without assuming the borehole axis to be parallel to one of the principal stresses. Small scale hydraulic fracturing tests were conducted to verify this technique at an underground power plant and micro seismic activities were monitored for fracture mapping. The direction of the fracture propagation awas estimated form the in situ stress state and compared with the fracture plane mapped by microseismic activities.
Copyright 1985, Geothermal Resources Council. Readers who download papers from this site should honour the copyright of the original authors, and may not copy or distribute the work further without the permission of the original publisher.