摘要
根据花岗岩裂隙型热储的构造条件,以及冷热水温差所引起的重力分异驱动力、注水水柱压力和水柱向下运动的惯性冲力等原理,采用热中心近距离强迫对流深循环热交换新技术,把约17℃的冷水加温成90℃左右的热水,促使地下水位大幅度回升。通过三次对比试验,取得圆满结果。该成果普遍适甩于以陡倾断层裂隙为热储的地热田人工补给回灌,它是解决这类热田地下热水资源不足的最经济方法之一。通过三次回灌对比试验,证明采用人工补给深循环热交换技术具有升温快、回收率高及水位回升大等优点,因此它是增大地热田的开采量、促使地下水位回升、防止地面下沉、改善水质等促使地热田“复生”,防止衰退的可靠保护措施。其经济效益、社会环境效益显著,且有利于改善福州市区对外开放的投资环境。同时,对沿海咸水温泉带及西藏、云南高温高矿化地热带的开发利用、设备的防腐蚀、防结垢及防止开采井堵塞等也具有一定的推广应用价值。
The paper presents the analyzing results of recharge tests in Fuzhou Geothermal Field. Based on the structural setting of the fissure-type granite thermal reservoirs and the principles of the gravity-differentiation driving force caused by water temperature difference and of injection water column pressure and downward inertia force of water columns, we used the new technique of deep circulation heat exchange by force in the thermal center of Fuzhou Geothermal Field at the short distance to turn the 17℃ injection water into the about 90℃ hot water and to faciliate the water level rising greatly again. The technique can be widely applicable for artificial recharge of the geothermal fields characterized by the thermal reservoirs of steep fault-fissure type, which is an efficient method of resolving the shortage of underground hotwater in this type of geothermal fields. All three recharge contratests in Fuzhou Geothermal Field obtained good results and prove that the technique possesses many advantages, such as quick temperature rising, high recovery of the recharge water and great rising of the underground water level. Therfore, it is a reliable measure of enlarging the production of geothermal field, rising the groundwater level. avoiding the ground subsidence and improving water quality , which has obvious economic and social-environmental effects in improvement of the investment environment of Fuzhou City. Its freshening is of great application value to protection from the production well jamming and for resistance to corrosion and incrustation of the equipments used in saline-water hotsprings of the coastal areas and high-temperature and mineralized geothermal belts in Tibet and Yunnan Provinces.
出处
《福建地质》
1991年第3期220-246,共27页
Geology of Fujian
