| 邱向荣.东莞市地热流体的地球化学成因模式研究[J].贵州地质,2021,38(4):405-411 |
| 东莞市地热流体的地球化学成因模式研究 |
| Geochemical Genetic Model of Geothermal Fluid in Dongguan City |
| 投稿时间：2021-03-01 |
| DOI： |
| 中文关键词: 地热流体 水文地球化学 成因模式 东莞市 |
| 英文关键词:Geothermal fluid Hydrological geochemistry Genetic model Dongguan City |
| 基金项目: |
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| 中文摘要: |
| 水文地球化学成因模式是地热系统成因机制研究的重要内容之一，但系统的水文地球化学成因模式研究目前仍处于探索阶段。为分析地热流体的水文地球化学成因模式，本文作者根据东莞塘厦大钟岭地热田的水文地质条件，采集了地热流体和其他主要水体(泉水、水库水、鱼塘水、机井和民井水)的化学样品，在试验结果基础上，通过对比分析并利用PHREEQC进行反向模拟，得出地热流体沿控热断裂循环过程中，发生了溶滤、氧化还原和阳离子交替吸附作用，从而将入渗区低矿化度重碳酸钙、钙镁型水逐渐演变为矿化度较高的重碳酸钙钠、钠钙型水，循环过程有较充足的二氧化碳参与，反映地热流体循环深度不太大、且处于偏氧化的环境。地热流体在循环过程中受大地热流持续供热，最终形成具有开发利用价值的地热资源。研究结果对其他地热流体的水文地球化学成因研究有借鉴作用，有利于指导地热资源的勘探和开发。 |
| 英文摘要: |
| The genetic model of hydrological geochemistry is important for understanding convection-type geothermal system, but it still need more work to do for deep understand the geochemical genetic model of geothermal system. In this paper, in order to understanding the hydrological geochemical genetic model of geothermal field clearly, based on the geological condition of geothermal field of Dazhongling in Tongsha of Dongguan, the chemical samples of 4 groups of geothermal fluid in dry season and the samples of the main water bodies (spring water, reservoir water, fish pond water, machine well and civilian well water) in the study area were collected for contrasting analysis. It’s known that the chemical composition and environmental isotopes of geological fluid and other water. We present the geological fluid originates from the air infiltration water of Dapingzhang Forest Park, the west side of geothermal field, by utilizing the reverse-simulating of PHREEQC program. When underground water circulates along heat-control fracture, it suffers from the dissolve filter, redox and cationic alternating adsorption, to result in the low salinity calcium carbonates--calcium magnesium type water of infiltration area changing into high salinity calcium-sodium carbonates--sodium calcium type water. Because the participation of abundant carbon dioxide in circulate process, it means the circulating depth of geothermal field is not very deep, and locating in deoxidation environment. The circulating length of geothermal field is about 5～6km, depth about 1000m. Lasted ten thousand years seepage, heating constantly by geothermal currents, the geothermal resource with exploitation value forms eventually. The results are helpful for studying on the geochemical origin of geothermal systems in other similar areas, which is beneficial to the exploration and development of geothermal resources. |
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