宜昌市百里荒一带地热资源形成条件及开发利用意义初探

Preliminary Study on Formation Conditions and Development and Utilization Significance of Geothermal Resources in Bailihuang Area of Yichang City

宜昌市百里荒景区一带地热流体主要赋存于寒武系、奥陶系及震旦系碳酸盐岩的溶隙中,热储盖层主要为志留系砂、页岩。景区南西侧施工一口井深2387.98 m大口径探采结合井,经连续数天抽水试验,在降深为134.89 m时,抽水量达1702 m3/d,出水温度51~52℃。属以层状热储为主的单斜构造型地热田。地热流体的水化学类型为SO4、HCO3—Ca、Mg型微咸水,水中氟元素(F-)含量达3.12 mg/L,按中国现行“理疗热水水质标准”,可命名为“氟矿水”,为温泉中的珍品,具有良好的杀菌、保健康养功能和广阔的开发利用前景。

The geothermal fluid in the Bailihuang scenic area of Yichang city mainly occurs in the karst fissures of Cambrian and Ordovician carbonate rocks,and the thermal reservoir caprock is mainly Silurian sand and shale.A large-diameter exploration and production well with a depth of 2387.98 m was constructed in the South and west side of the scenic spot.After several consecutive days of pumping test,when the drawdown is 134.89 m,the pumping capacity is 1702 m3/d and the water temperature is 51~52℃.It belongs to the“monoclinic structure type”geothermal field which is mainly composed of layered heat storage.The hydrochemical type of geothermal fluid is SO4,HCO3-Ca,Mg type brackish water.The content of fluorine(F-)in the water reaches 3.12 mg/L.According to the current“water quality standard of physiotherapy hot water”,it can be named“fluorine mineral water”,which is a treasure in hot spring.It has good sterilization,health care and health care functions and broad prospects for development and utilization.