Abstract
The Chingshui geothermal field is the largest known productive geothermal area in Taiwan. The purpose of this paper is to delineate this geothermal structure by integrating geophysical data and borehole information. The existence of a magma chamber in the shallow crust and shallow intrusive igneous rock results in a high heat flow and geothermal gradient; furthermore, the NE deep fault system within the meta-sandstones provides meteoric recharge from a higher elevation to artesianally drive the geothermal system. There is evidence that geothermal fluid deeply circulated within the fracture zone and was heated by a deeply located body of hot rock. The geothermal reservoir of the Chingshui geothermal field might be related to the fracture zone of the Chingshuihsi fault. It is bounded by the C-fault in the north and Xiaonanao fault in the south. Based on information obtained from geophysical interpretations and well logs, a 3-D geothermal conceptual model is constructed in this study. Further, the geothermal reservoir is confined to an area that is 260 m in width, N21W, 1.5 km in length, and has an 80 dip toward the NE. A high-temperature zone is found in the SE region of the reservoir, which is about 500 m in length; this zone is located near the intersection of the Chingshuihsi and Xiaonanao faults. An area on the NE side of the high-temperature zone has been recommended for the drilling of production wells for future geothermal development.
Highlights
Promotion of renewable energy sources is growing worldwide
Fig. 12. 3-D geothermal conceptual model of the zoomed-in area of the black dashed box in Fig. 9. (a) The reservoir is confined in an area 260 m in width, N21°W, and it dips 80° to the NE. (b) The iso-temperature surface dips steeply toward the east, and high-temperature hot water rises upward in the SE region of the reservoir
The existence of the magma chamber and the intrusive igneous rock results in a high heat flow and geothermal gradient; the NE deep fault system within the meta-sandstone provides a meteoric recharge from a higher elevation to artesianally drive the geothermal system
Summary
Promotion of renewable energy sources is growing worldwide. Geothermal energy is one such energy source and it is both relatively cheap and efficient (Fridleifsson 2001; Bertani 2005; Lund et al 2005). The ITRI and CPC conducted the following surveys: gravity (Lee 1994), resistivity (Cheng and Lee 1977; Su 1978), transient electromagnetic (Chiang and Liu 1983), and geologic (Tseng 1978; Hsiao and Chiang 1979). Some exploration of this field has been undertaken in the past (Cheng and Lee 1977; Su 1978; Tseng 1978; Hsiao and Chiang 1979; Chiang and Liu 1983; Lee 1994), the structure of the geothermal reservoir is still not well delineated; this could affect the design of new production wells as regards their appropriate locations and borehole traces. Additional magnetotelluric (MT) data acquired in this study and well information were integrated to establish the geothermal conceptual model for the Chingshui area
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
