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首页> 外文期刊>Pure and Applied Geophysics >Understanding the 3D Structure of a Thermal Water Fissured Granite Aquifer by Use of Geophysical Studies
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Understanding the 3D Structure of a Thermal Water Fissured Granite Aquifer by Use of Geophysical Studies

机译：通过地球物理研究了解热裂水花岗岩含水层的3D结构

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摘要

The thermal hot springs of Caldas de Monção, located in Northern Portugal, are supplied by a thermal water aquifer that must be preserved from pollution and anthropic effects. Enhancement of knowledge about the aquifer is therefore needed, so sustainable management and water quality preservation can be conducted, namely by replacing the springs by boreholes, which are less vulnerable to pollution. Several investigations have been conducted with this purpose, to review the available geological and hydrogeological information from the area. For this reason, several geophysical surveys were reprocessed and others were acquired and planned, so that a 3D conceptual groundwater flow model of could be drawn. Three seismic reflection profiles were acquired with the objective of locating deep faults capable of transporting groundwater to the surface and to complement information about shallow features available before the seismic survey. This information included interpretation of a dipole–dipole survey conducted in 2001, that reached an investigation depth of approximately 40 m, and two shallow boreholes drilled, after a deeper geoelectrical survey performed in the 1980s, to replace the springs. Besides the seismic reflection profiles, seven vertical electrical soundings were also acquired and refraction interpretation of the first reflection data to arrive was also undertaken to complement the information. This paper reports integrated interpretation of the geophysical and geological data to obtain a 3D conceptual model to achieve the above mentioned objectives. After interpretation and lateral correlation of the structures found in the geophysical profiles, the deep 3D conceptual model integrating the geological, hydrogeological, and geophysical information was constructed. This model was the basis for planning the location of an exploratory borehole that was drilled afterwards. From two initial locations appearing as the strongest candidates for a successful thermal water production well, one was chosen to drill a third borehole to supply the spa facilities. The third borehole results were very positive—250 m deep, temperature approximately 50°C, and water flow 12.5 l/s. This example shows the utility of using geophysical methods to increase knowledge about groundwater circulation and detect favourable areas for thermal water borehole drilling to replace the hot springs with the objective of protecting the aquifer from pollution.
机译：位于葡萄牙北部的Caldas deMonção的温泉是由热水蓄水层提供的，必须防止污染和人为影响。因此，需要增加有关含水层的知识，因此可以进行可持续管理和水质保护，即用不易受到污染的钻孔代替弹簧。为此进行了一些调查，以审查该地区可获得的地质和水文地质信息。因此，对一些地球物理勘测进行了重新处理，并对其他一些地球勘测进行了规划，从而可以绘制3D概念性地下水流模型。采集了三个地震反射剖面图，目的是确定能够将地下水输送到地表的深层断层，并补充地震勘探前可用的浅层特征信息。这些信息包括对2001年进行的偶极子-偶极子测量的解释，该测量深度达到约40 m，并且在1980年代进行了更深的地电测量后，钻了两个浅孔，以代替弹簧。除地震反射剖面外，还获取了七个垂直电测深，并对到达的第一个反射数据进行了折射解释，以补充这些信息。本文报告了对地球物理和地质数据的综合解释，以获得实现上述目标的3D概念模型。在对地球物理剖面中发现的结构进行解释和横向相关之后，构建了整合了地质，水文地质和地球物理信息的深层3D概念模型。该模型是计划随后钻探的勘探井孔位置的基础。从两个最初的位置看来，它们是成功生产热水的最佳选择，其中一个位置被选为第三个钻孔，以供应水疗设施。第三次钻孔的结果非常好，深度为250 m，温度约为50°C，水流量为12​​.5 l / s。此示例显示了使用地球物理方法来增加对地下水循环的了解并检测热水钻孔钻井以取代温泉的有利区域的实用性，目的是保护含水层免受污染。

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  • 来源
    《Pure and Applied Geophysics》 |2012年第11期|p.2031-2046|共16页
  • 作者

    E. C. Ramalho; J. P. Carvalho; R. Gonçalves; F. A. Monteiro Santos;

  • 作者单位

    Laboratório Nacional de Energia e Geologia, LNEG, Estrada da Portela, Bairro do Zambujal, Apartado 7586, 2720-866, Amadora, Portugal;

    Laboratório Nacional de Energia e Geologia, LNEG, Estrada da Portela, Bairro do Zambujal, Apartado 7586, 2720-866, Amadora, Portugal;

    Instituto Politécnico de Tomar, ESTT, Área Física, Quinta do Contador, 2300-313, Tomar, Portugal;

    Universidade de Lisboa, Centro de Geofísica da Universidade de Lisboa-IDL, Campo Grande, Ed. C8, 1749-016, Lisbon, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geophysics; hydrogeology; thermal water; granites;

    机译：地球物理;水文地质;热水;花岗岩;

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