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| | Abstract | | Improving success rates in geothermal reservoir exploration, a project that aims to develop geothermal reservoir exploration techniques has started by JOGMEC. Seismic exploration method, which is widely used in the oil industry, is one of the optimistic techniques for geological risk mitigation. Evaluating the validity of applications of recent seismic processing techniques to the geothermal field data, reprocessing of the legacy data from Kakkonda, Ogiri, Ogachi and Akinomiya was conducted and the following techniques were examined: 1) simultaneous application of various noise elimination techniques, 2) a refraction tomography with a Monte Carlo uncertainty analysis, 3) prestack depth migration (PSDM), 4) a tomographic refraction statics correction, 5) a crossdip correction, and 6) common reflection surface stack methods. In Ogiri field, a significant improvement in fracture imaging was achieved by the noise elimination. The refraction tomography of Kakkonda data showed a consistent result with a former geological study based on well data. The PSDM depicted a steeply dipping reflector at a depth of 1,000 m in Ogachi-Akinomiya field. We also discuss some issues which relates to difficulties in seismic exploration in geothermal areas. |
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