清水地熱區儲集層參數研究及發電潛能評估

Study on Reservoir Parameters and Evaluation of Power Generation Potential in Chingshui Geothermal Field, Taiwan

李清瑞(Ching-Ray Lee) ； 韓吟龍(Yin-Lung Han) ； 江道義(Dao-Yi Jang)

《臺灣鑛業》 64卷1期 (2012/03) Pp. 9-17

https://doi.org/10.30014/TMI.201203.0003

摘要

清水地熱田為熱液型地熱系統，依據以往探勘資料，本區所鑽獲之熱液溫度與產率極高，具有相當大之發電潛能。本研究綜合清水地熱區早期既有文獻資料及近年來修井與新鑽井完成後之相關產能測試數據，推估主要儲集層參數如下：(1)清水地熱區儲集層深度約為500至2,000m。(2)溫度約180~ 220℃。(3)儲集層之流動係數（kh）約在2~8.8 darcy-m之間。(4)循環熱液之來源為天水，區域地溫梯度超過45℃/km。(5)經深循環加熱之深度約為4~5 km。若以2,000m地層深度作為清水地熱區開採深度下限，溫度高於180℃之核心區儲集層分布面積約1 km2，發電潛能約5.3 MWe；溫度高於160℃之潛能區儲集層分布面積約4 km2，發電潛能約14.4 MWe。

關鍵字

清水地熱 ； 儲集層參數 ； 發電潛能

並列摘要

Chingshui geothermal field is a liquid dominated geothermal system. Since many exploratory wells tapped high temperature geothermal fluid with considerable productivity, this field has been evaluated as a promising geothermal area to be developed for power generation and multiutilization. Based on the exploration data, the key reservoir parameters have been estimated as follows:1) The productive zone of the reservoir is between the depth from 500 to 2,000 m.2) The regional reservoir temperatures are about 180~220℃.3) The reservoir flow capacities are ranging from 2 to 8.8 darcy-m.4) Regional geothermal gradient of the potential area is higher than 45℃/km.5) Meteoric water circulation depth may reach 4 to 5 km and heating up by the high geothermal gradient.By use of stored heat method, the power generation potential is estimated to be 5.3 MWe within the proven 1 km2 area with reservoir temperature higher than 180℃, while for the reservoir temperature higher than 160℃, the potential area may increase to 4 km2 and the power generation potential may increase to 14.4 MWe.

並列關鍵字

Chingshui geothermal field ； reservoir parameter ； power generation potential