Estimation of subsurface structure by means of the Triaxial Drill-bit VSP (proof test)

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(1) Development of softwares and hardwares ; realtime and post-analysis software packages were made. We also developed highly sensitive 3C sensor.(2) Field experiment ; A measurement well was drilled in JNOC Kashiwazaki Test Field and we carried out seismic measurement experiment in this field in 1992,3, and 4. Seismic measurement was also made in Ogachi(Akita)and Hachimantai(Iwate)fields.(3) Analysis of field data ; (a)geothermal reservoir in Ogachi field was detected by the TAD-VSP method, (b)subsurface structure in Hachimantai field was imaged by the technique, (c)good agreement was observed between log data and TAD-VSP data in JNOC Kashiwazaki field.(4) General analysis ; informations on subsurface structure in the fields were compared with the TAD-VSP data deduced in this project.(5) Suggestion of the TAD-VSP method ; a suggestion was made by the investigators to realize TAD-VSP.