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Integrating Geophysical Data for Imaging the Potential Reservoir of the Chingshui Geothermal Field in Northeastern Taiwan
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2012-06-15T07:43:33Z
|Abstract: ||In this study, we have reviewed and reprocessed various surface geophysical survey results and the borehole logging data in order to better delineate the geothermal reservoir and its relative geological structures in the Chingshui area. The Chingshui geothermal field has been acknowledged to have a great potential for geothermal production in Northeast Taiwan. A pilot geothermal power plant with 3MW capacity had been built since 1981 in the area and the plant was seized to function in 1992 due to scaling problems and depletion of the steam production. Though a lot of explorations have been done in the past, there are few reservoir models established because (1) geophysical surveys were conducted in different resolutions and scales and difficult to be integrated in the same model, (2) 1-D or 2-D geophysical measurements were not integrated and re-examined in a 3-D framework for delineating the structure relationships in a 3D sense, and (3) relationships between the formation properties, such as porosities and the water saturation, and the geophysical measurements were not yet established due to lack of core samples or detailed well logging data. In this study, we utilized data from magnetotelluric and electrical resistivity surveys, as well as borehole logging measurements for constructing a general reservoir model, and tried to verify it with the borehole geophysical logging data that are collected from an open section in the geothermal test well drilled recently. Currently we have integrated different geophysical data onto the same 3D framework and tried to apply geostatistical analysis for constructing the 3D geophysical picture. Our preliminary results have revealed two low resistivity regions representing the fracture reservoir filled with hot fluids within 2000m from the surface. These regions were limited in a 2-km2 narrow area along the Chingshui river valley. The shallower low-resistivity region, Zone I, is near the surface and its bottom is at about 600-m to 800-m in depth, and it is extended vertically to the surface. The deeper one, Zone II, is located south of zone I at about 1000-1500m in depth. Zone I and Zone II regions seem to be connected with each other and are dipping to the South. Based on the interpolated 3D resistivity model, we estimated the volume of the potential reservoir with low resistivity is about 95 million cubic meters and contains about 9.5 million cubic meters of geothermal fluids. Our future work will focus on incorporating borehole geophysical logging into the framework and trying to conduct statistical analysis for relating the electrical properties to the formation properties.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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