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| | Abstract | | Geophysical techniques had been developed in the JOGMEC Geothermal Demonstration Project since 2013. In the Phase I Project during fiscal year 2015, the 3D surface seismic survey was acquired in the Yamagawa Demonstration Area, located at the city of Ibusuki in Kagoshima, Japan. In the Phase II Project during fiscal year 2016, a wide variety of research studies were carried out using the 3D seismic data. We present the results of a research study focusing on integrated analysis using gravity, seismic and well log data in 3D geothermal modelling. A workflow of 3D geothermal modelling was applied with geostatistical technique and multi-attribute analysis. The integrated workflow included joint/simultaneous inversion to improve the reliability of estimating rock properties for the use of multiple geophysical data. The integrated analysis illustrates a key role in delineating complex geological structures. A rock physics investigation of igneous rocks allows us lithofacies classification for geothermal reservoir characterization. The integrated workflow of 3D geological modelling has an advantage of quantitative interpretation in geothermal exploration and development. |
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