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河北牛驼镇地热田高温地热水成因分析

         

摘要

Niutuozhen geothermal field, especially in the bedrock thermal reservoir, is currently developed and utilized well. The bedrock reservoir water temperature of Niutuozhen is 60℃~100℃the depth of the top plate is less than 500m, general 800~1500m3the water inflow is 50~110 m3/h. The Niutuozhen bedrock geothermal water chemicals is Cl-Na type water, concentration of partial acid is 46~92mg/L, concentration of partial boric 5.0~33mg/L,concentration of lfuoride 5.41~11mg/L,so it is as the high quality physical therapy mineral water. According to the analyses of the formation of high-temperature geothermal water from the perspective of structural movement, the study area is considered that not only has a good basement reservoir but also stores a rich source of water after the ifve geological history stages "three settlements and two uplift" from the beginning of Proterozoic Lvliang movement to Permian. With the active of Himalayan movement, under the control of Niudong fault etc., Niutuozhen upswell was developed. In this process, the Niutuozhen upswell was exposed out of the surface, the Neogene and Quaternary strata were formed, and the bedrock heat storage was formed by the good cover strata. In addition, because of the high thermal conductivity of bedrock thermal reservoir, and the shallow buried depth, Niutuozhen geothermal ifeld stored the relatively high-temperature geothermal water resources.%牛驼镇地热田以基岩热储层最优,是目前地热田开发利用条件最好的热储层。牛驼镇基岩热储水温60℃~100℃,顶板埋深最浅处小于500m,一般为800~1500m,涌水量50~110 m3/h。基岩地热水水化学类型为Cl—Na型水,偏硅酸浓度46~92mg/L,偏硼酸浓度5.0~33 mg/L,氟浓度5.41~11 mg/L,是优质的理疗矿泉水。本文着重从构造运动的角度分析了牛驼镇高温地热水的形成。阐述了自元古代的吕梁运动开始至二叠纪期间,研究区在经过“三降两升”的五个地史发展期中不仅沉积了良好的基岩热储层,亦储藏了丰富的水源。随着新生代喜山运动的活跃,在牛东等断裂的控制下,牛驼镇凸起发育成熟,在此过程中,牛驼镇凸起暴露地表,沉积了新近系和第四系,构成基岩热储的良好盖层。另外,由于基岩热储岩性的热导率较高及埋藏深度较浅,使得牛驼镇地热田拥有相对较高温度的地热水资源。

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