Two boreholes were drilled and continuous cores were recovered in order to carry out a detailed core description at centimeter scale and a comprehensive sampling of borehole cores.
Earthquakes have been studied at TRIES using instruments developed by our group (Ishii et al. 1997, 2002) for comprehensive observations in deep boreholes.
To determine flow parameters, the tracer tests were complemented by a comprehensive set of depth-specific borehole and hydraulic tests.
The comprehensive methodology can account for multi-borehole fields and allows predicting accurately heat transfer over a large range of design parameters, ground properties and time scales.
The stress sensitivity examination results for the stress meter components incorporated in the comprehensive observation device installed at the TOS borehole station are provided in Table 1.
Figure 8 shows a comprehensive observation device installed at the Toshinomori (TOS) borehole station (depth of 512 m), which is one of our borehole observation stations.
In this study, a reservoir stimulation simulator toolbox was developed for the comprehensive EGS design considering the natural fracture distribution, borehole stability, hydraulic stimulation and the thermal performance of the reservoir.
Figure 12 shows the stress seismic motion waveforms recorded by the stress meter in the comprehensive crustal activity observation device at the TOS borehole station (depth of 512 m) during the 2011 Tohoku earthquake (M 9.0), which occurred on 11 March 2011.
