三重体Ra226,Ra228,Ra224在盐水中的深水 - - 一个有价值的信息来源
Detlev Degering1, Norman Dietrich1, Matthias Köhler1
1VKTA - Strahlenschutz, Analytik & Entsorgung Rossendorf e. V., Bautzner Landstraße 400, Dresden, 01328, Germany.
Journal of environmental radioactivity
|May 22, 2024
概括
地热发电厂的高度盐的深水显示出高同位素. 蒙特卡洛模型解释了这些水平,突出了细粒岩的作用,并使矿物沉物的年龄确定.
科学领域:
- 地质化学 地质化学
- 水文地质学 水文地质学
- 核科学 核科学 核科学
背景情况:
- 高度的同位素 (226Ra,228Ra,224Ra) 在盐,无氧的深水中很常见,特别是那些用于地热能源生产的水域.
- 了解这些环境中的辐射行为的过程对于管理地热运营和解释水地化学数据至关重要.
研究的目的:
- 开发和验证一个模型,解释深层盐水中观察到的活动水平.
- 研究岩石流体相互作用的影响,如α反弹,吸附和沉,对度的影响.
- 将模型应用于地热盐水和沉物,以获得操作洞察力.
主要方法:
- 开发一个包含岩石流体接口过程 (α反弹,吸附,表面沉) 的蒙特卡洛模拟模型.
- 该模型用于分析地热盐水中的度和活性比率 (228Ra/226Ra,224Ra/228Ra).
- 在矿物沉中放射性不平衡的数学建模,以确定其年龄.
主要成果:
- 具有高自然衰变链活动的细粒度储层岩石组成部分 (例如,粘土石) 是盐水中度升高的主要来源.
- 确定了含水层岩石中的Th/U比率与流体中的228Ra/226Ra活性比率之间的相关性.
- 模型模拟准确地复制了来自北德盆地地热电厂的流体数据,表明显著的吸附 (约. 50%),并建议从孔引导运输转向在生产井附近的断裂引导运输.
- 硫酸盐尺度沉物的年龄测定揭示了与工厂运营修改的相关性.
结论:
- 开发的蒙特卡洛模型有效地解释了地热盐水中的同位素行为.
- 吸附和运输机制在控制流体度方面发挥着重要作用.
- 矿物沉物的分析为地热发电厂的运行提供了宝贵的见解,有助于缩小规模和尽量减少停机时间.
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