Learning about Hydrothermal Volcanic Activity by Modeling Induced Geophysical Changes
Learning about Hydrothermal Volcanic Activity by Modeling Induced Geophysical Changes
复制标题
通过模拟引起的地球物理变化了解热液火山活动
DOI：
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发表时间：
2017
影响因子：
2.9
通讯作者：
R. Napoli
中科院分区：
文献类型：
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作者：
G. Currenti;R. Napoli
出于不断努力了解地热资源的性质和能源潜力，我们设计了一个耦合的数值模型（水文，热，机械），这可能有助于通过计算实验的热液系统的表征和监测。火山地区的热液区是由地质和水文特征的独特组合产生的，这些特征调节着能够产生大量蒸汽和热水的岩浆源附近的流体运动。数值模拟有助于理解和表征岩石-流体相互作用过程以及与之相关的地球物理观测。我们的目标是在合理的地质框架（例如流动的分布和路径、断裂带的存在、盖层）的基础上量化不同地球物理观测量（即变形、重力和磁场）对热液活动的响应。通过地球物理建模方法详细理解和量化地热系统的演化和动态以及其内部状态的定义，对于确定地热系统可能满足作为能源开发要求的关键参数至关重要。仅为说明起见，数值计算集中在Vulcano岛热液系统的概念模型上，模拟了一个通用的1年动荡，并估计了不同的地球物理变化。我们解决了（i）的质量和能量平衡方程的温度，压力和密度变化的多孔介质中的流动，（ii）的弹性静力方程的变形场和（iii）的泊松方程的重力和磁位场。在模型假设下，一个通用的动荡1年在地面上产生低幅度的变化，在调查的地球物理观测，这是，但是，以上的现代国家的最先进的仪器的准确性。设计多学科和易于使用的计算实验，使我们能够了解热液系统如何响应不稳定，它可能会留下哪些指纹的地球物理信号。
Motivated by ongoing efforts to understand the nature and the energy potential of geothermal resources, we devise a coupled numerical model (hydrological, thermal, mechanical), which may help in the characterization and monitoring of hydrothermal systems through computational experiments. Hydrothermal areas in volcanic regions arise from a unique combination of geological and hydrological features which regulate the movement of fluids in the vicinity of magmatic sources capable of generating large quantities of steam and hot water. Numerical simulations help in understanding and characterizing rock-fluid interaction processes and the geophysical observations associated with them. Our aim is the quantification of the response of different geophysical observables (i.e. deformation, gravity and magnetic field) to hydrothermal activity on the basis of a sound geological framework (e.g. distribution and pathways of the flows, the presence of fractured zones, caprock). A detailed comprehension and quantification of the evolution and dynamics of the geothermal systems and the definition of their internal state through a geophysical modeling approach are essential to identify the key parameters for which the geothermal system may fulfill the requirements to be exploited as a source of energy. For the sake of illustration only, the numerical computations are focused on a conceptual model of the hydrothermal system of Vulcano Island by simulating a generic 1-year unrest and estimating different geophysical changes. We solved (i) the mass and energy balance equations of flow in porous media for temperature, pressure and density changes, (ii) the elastostatic equation for the deformation field and (iii) the Poisson’s equations for gravity and magnetic potential fields. Under the model assumptions, a generic unrest of 1-year engenders on the ground surface low amplitude changes in the investigated geophysical observables, that are, however, above the accuracies of the modern state-of-the-art instruments. Devising multidisciplinary and easy-to-use computational experiments enable us to learn how the hydrothermal system responds to un unrest and which fingerprints it may leave in the geophysical signals.
影响因子：
3.3
作者：
Battaglia, Maurizio;Gottsmann, Joachim;Fernandez, Jose
通讯作者：
Fernandez, Jose