Interpretation of a well interference test at the Chingshui geothermal field, Taiwan

Fan, Kai; Kuo, M.C.T.; Liang, K. F.; Lee, C. Shu; Chiang, S. C.

doi:10.1016/j.geothermics.2004.11.003

Cited by 15 publications

(4 citation statements)

References 4 publications

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“…For most sedimentary rocks it is found to be in the 1.1 -2.5 range (e.g., Doveton 1986;Ruffet et al 1991;Guéguen and Palciauskas 1994), "n" is the saturation exponent, and "a" is the tortuosity factor. The average Na + concentration is 1122 ppm (0.1 wt%) measured from geothermal fluids produced onsite at 225°C (Fan et al 2005) which corresponds to a solution resistivity of about 0.80 ohm-m. This unusual higher converted resistivity is inconsistent with brines under high temperature situations.…”

Section: Discussionmentioning

confidence: 99%

“…The effective porosities are consistent with typical porous sediment. Moreover, fluid resistivity of 0.80 ohm-m was measured from produced geothermal wells at 225°C (Fan et al 2005) and used to roughly estimate the percentage of interconnected fluids from the C2 conductive anomaly concluded from 10.4 -26.1% (blue solid line shown in Fig. 9).…”

Section: Discussionmentioning

confidence: 99%

“…The plant was decommissioned because of low productivity. By 1992 the average electricity output had decreased to 0.18 MW (Fan et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of the 3D Electrical Resistivity Structure in the Chingshui Geothermal Area, NE Taiwan

Chiang¹,

Hsu²,

Chen³

2015

Terr. Atmos. Ocean. Sci.

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The Chingshui geothermal area southwest of the Ilan plain is identified as a western extension of the Okinawa Trough in the northern Taiwan subduction system. Numerous geophysical, geological and geochemical investigations have been conducted since the 1970s by the Industrial Technology Research Institute, the Chinese Petroleum Corporation of Taiwan and the National Science Council of Taiwan. These studies indicated that the Chingshui stream is one of the largest geothermal areas for electricity generation in Taiwan. However, the power generation efficiency has not met initial expectations. Magnetotelluric (MT) data analyses show that the Chingshui geothermal region is a geologically complex area. A full three-dimensional (3D) inversion was therefore applied to reprocess the MT data and provide the detailed electrical structure beneath the Chingshui geothermal region. The 3D geoelectrical model displays an improved image that clearly delineates the Chingshui geothermal system geometry. Two conductive anomalies are imaged that possibly indicate high potential areas for geothermal energy in the Chingshui geothermal system. One of the potential areas is located in the eastern part of the Chingshui Fault at shallow depths. A significant conductive anomaly is associated with high heat flow and fluid content situations southwest of the geothermal manifest area at depth. A higher interconnected fluid indicates that this area contains the highest potential for geothermal energy in the Chingshui geothermal system.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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An Investigation of the 3D Electrical Resistivity Structure in the Chingshui Geothermal Area, NE Taiwan

Chiang¹,

Hsu²,

Chen³

2015

Terr. Atmos. Ocean. Sci.

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“…But only few studies have been carried out in metamorphic geothermal fields in Taiwan, and most of them are concentrated in the Chingshui geothermal field. It has been suggested that Chingshui geothermal field has fault-related water circulation that brings heat to the surface [16][17][18]. Kuo et al (2018) [18] attempted to characterize the water flow pattern in a metamorphic shallow geothermal system in Yilan, Taiwan.…”

Section: Introductionmentioning

confidence: 99%

Integrating Stable Isotopes with Mean Residence Time Estimation to Characterize Groundwater Circulation in a Metamorphic Geothermal Field in Yilan, Taiwan

Kuo

Lin

et al. 2022

Water

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This paper presents a water circulation model by combing oxygen and hydrogen stable isotopes and mean residence time (MRT) estimation in a high-temperature metamorphic geothermal field, Tuchen, in Yilan, Taiwan. A total of 18 months of oxygen and hydrogen stable isotopes of surface water and thermal water show the same variation pattern, heavier values in summer and lighter values in the rest of the year. A shift of δ18O with a relative constant δD indicates the slow fluid–rock interaction process in the study area. Two adjacent watersheds, the Tianguer River and Duowang River, exhibit different isotopic values and imply different recharge altitudes. The seasonal variation enabled us to use stable isotope to estimate mean residence time of groundwater in the study area. Two wells, 160 m and 2200 m deep, were used to estimate mean residence time of the groundwater. Deep circulation recharges from higher elevations, with lighter isotopic values, 5.9‰ and 64‰ of δ18O and δD, and a longer mean residence time, 1148 days, while the shallow circulation comes from another source with heavier values, 5.7‰ and 54.4‰ of δ18O and δD, and a shorter mean residence time, 150 days. A two-circulation model was established based on temporal and spatial distribution characteristics of stable isotopes and the assistance of MRT. This study demonstrates the usefulness of the combined usage for further understanding water circulation of other various temperatures of metamorphic geothermalfields.

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Hydrochemistry of hot springs in geothermal fields of central, northern, and northeastern Taiwan: implication on occurrence and enrichment of arsenic

et al. 2016

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Interpretation of a well interference test at the Chingshui geothermal field, Taiwan

Cited by 15 publications

References 4 publications

An Investigation of the 3D Electrical Resistivity Structure in the Chingshui Geothermal Area, NE Taiwan

An Investigation of the 3D Electrical Resistivity Structure in the Chingshui Geothermal Area, NE Taiwan

Integrating Stable Isotopes with Mean Residence Time Estimation to Characterize Groundwater Circulation in a Metamorphic Geothermal Field in Yilan, Taiwan

Hydrochemistry of hot springs in geothermal fields of central, northern, and northeastern Taiwan: implication on occurrence and enrichment of arsenic

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