Thermohaline modelling of hot geothermal fluid systems in coastal environment: the Seferihisar-Balcova Area example (Turkey)

沿海环境中热地热流体系统的温盐模拟：Seferihisar-Balcova 地区示例（土耳其）

• 批准号: 74790811
• 负责人: Privatdozent Dr. Fabiano Magri
• 金额: --
• 依托单位: Bundesamt für die Sicherheit der nuklearen Entsorgung (BASE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/74790811?language=en
• 关键词: Thermohaline; modelling; hot; geothermal; fluid

The worldwide concern about the consequences of global warming is increasing interest in developing geothermal resources, both for power generation and direct use. This is providing new field data for geochemical and numerical investigations of extensional geothermal systems. The numerical models should explore the role of faults and fractures on the different forces driving hot fluid flows as well as the impact of anthropogenic activities and seawater intrusions on thermal fluid circulation. To date, however, there has been limited effort made to systematically determine the basic relationships between system configuration (e.g., hydraulic permeability, inherited geological structures) and the resulting thermally induced flow behaviour of geothermal systems. An exceptional example to investigate the mentioned issues is the hot Seferihisar-Balçova Geothermal system (SBG) which is part of the Cesme Peninsula, Western Anatolia, Turkey. In the SBG, geothermal processes are extremely vigorous and hot waters close to boiling temperature can be observed at the surface. The driving mechanisms of fluid flow and their interrelationships with faults are poorly understood. Furthermore, the fluid transport processes are characterized by complex temperature and hydrochemical anomalies. Their causes remain still unclear. Not at least, the geothermal energy extraction in the coastal aquifers of this area induces seawater intrusion which pollutes freshwater resources. In the last years, the SBG, has been thoroughly investigated for its geothermal resources. As a result, an extensive database has been gathered. Owing to a pre-established collaboration between the FU Berlin and the Dokuz Eylül University, Izmir, the database is now available for scientific research. Thus, it will be possible to apply numerical modelling, water chemistry, hydrogeology approaches to study the dynamics of geothermal fluid migration. The final objective is to understand the basic processes driving the thermal waters within the SBG, the role of different driving forces as well as their interactions in controlling geothermal processes. The results will shed new light on the links between the migration of subsurface energy, active transport processesand tectonic structures.

全世界对全球变暖的后果的关注正在增加对开发地热资源的兴趣，既用于发电又用于直接使用。这为伸展地热系统的地球化学和数值研究提供了新的野外资料。数值模型应探讨断层和裂缝在驱动热流体流动的不同力量中的作用，以及人类活动和海水入侵对热流体循环的影响。然而，迄今为止，在系统地确定系统配置（例如，水力渗透性、继承的地质结构）以及由此产生的地热系统的热致流动行为。调查上述问题的一个例外的例子是热Seferihisar-Balçova Gebrit系统（SBG），它是土耳其西安纳托利亚切什梅半岛的一部分。在SBG中，地热过程非常剧烈，在表面可以观察到接近沸腾温度的热沃茨。流体流动的驱动机制及其与断层的相互关系还知之甚少。此外，流体输送过程的特点是复杂的温度和水化学异常。其原因仍不清楚。至少，该地区沿海含水层的地热能开采会导致海水入侵，污染淡水资源。在过去的几年里，SBG对其地热资源进行了彻底的调查。因此，已经收集了一个广泛的数据库。由于柏林联邦大学和伊兹密尔的Dokuz Eylül大学之间预先建立的合作关系，该数据库现已可用于科学研究。因此，将有可能应用数值模拟、水化学、水文地质方法来研究地热流体迁移的动力学。最终的目标是了解基本过程中驱动的热沃茨内的SBG，不同的驱动力的作用，以及它们的相互作用，在控制地热过程。这一结果将对地下能量迁移、主动输运过程和构造构造之间的联系提供新的认识。