The Campi Flegrei geothermal system sets in one of the most famous and hazardous volcanic caldera in the world. The geothermal dynamics is suspected to have a crucial role in the monitored unrest phases and in the eruption triggering as well. Numerical models in the literature do not properly consider the geochemical effects of fluid-rock interaction into the hydrothermal circulation and this gap limits the wholly understanding of the dynamics. This paper focuses on fluid-rock interaction effects at the Campi Flegrei and presents relevant information requested for reactive transport simulations. In particular, we provide: (1) an extensive review of available data and new petrographic analyses of the San Vito cores rearranged in a conceptual model useful to define representative geochemical and petrophysical parameters of rock formations suitable for numerical simulations and (2) the implemented thermodynamic and kinetic data set calibrated for the San Vito 1 well area, central in the geothermal reservoir. A preliminary 0D-geochemical model, performed with a different contribution of CO₂ at high (165 °C) and low (85 °C) temperatures, firstly allows reproducing the hydrothermal reactions over time of the Campanian Ignimbrite formation, the most important deposits in the case study area.

中文翻译：

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意大利 Campi Flegrei 地热系统圣维托地区的热液变化：矿物回顾和地球化学建模

Campi Flegrei 地热系统位于世界上最著名和最危险的火山口之一。地热动力学被怀疑在监测到的动荡阶段和喷发触发中也起着至关重要的作用。文献中的数值模型没有正确考虑流体-岩石相互作用对热液循环的地球化学影响，这种差距限制了对动力学的全面理解。本文侧重于 Campi Flegrei 的流体-岩石相互作用效应，并提供反应输运模拟所需的相关信息。我们特别提供：(1) 对可用数据和圣维托岩心的新岩相分析进行了广泛审查，重新排列在一个概念模型中，该模型有助于定义适合数值模拟的岩层的代表性地球化学和岩石物理参数，以及 (2) 实施的热力学和动力学数据集校准位于地热储层中央的圣维托 1 井区。一个初步的 0D 地球化学模型，使用不同的 CO 贡献₂在高温 (165 °C) 和低温 (85 °C) 下，首先可以重现 Campanian Ignimbrite 地层随时间推移的热液反应，这是案例研究区域中最重要的沉积物。