Investigation of thermo-hydro-mechanical processes in deep crystalline rock - experiments and numerical modeling

虽然热、水力和地质力学耦合系统很复杂，但它的量化对于理解和描述地质系统中的自然和人为诱导过程是非常重要的。因此，该项目(现为第三阶段)对深部结晶岩石(KTB和Urach)的总体目标是双重的：通过使用计算机模拟和实验技术分析主导过程，以及随后对这些系统进行预测模拟。重点将放在通过热干岩原理潜在的地热利用上。模拟技术和实验技术将继续相辅相成地发展，涵盖主要在KTB工地运行的流动、运输(热量和示踪剂)和变形过程的调查和分析。这些模型和假设将与实验室规模和现场规模的实验结果进行验证。所开发的预测工具对于乌拉赫人类发展报告系统的设计和确定水库规模的热-水-机械过程的重要性(例如，水力试验期间的固结和相关的热-机械效应)将是重要的。建模方法是整体性的，包括热力、液压和机械模拟部件。软件的开发是基于我们自己的面向对象的计算机系统GEOsys。实验计划包括热和反应示踪测试(推-拉-测试)，以定量描述水力活动裂缝和热传输系统。

Quantification of thermal, hydraulic and geomechanic, coupled systems although complex is very important for the understanding and characterization of natural as well as man-induced processes in geosystems. Accordingly the general target of this project (now Phase 3) for deep crystalline rock (KTB and Urach) is twofold: the analysis of the dominant processes by employing computer modelling and experimental techniques, and the subsequent predictive modelling of such systems. An emphasis will be placed on the potential geothermal usage via the Hot Dry Rock principal. Modelling techniques and experimental techniques will continue to be developed complimentarily and cover the investigation and analysis of the flow, transport (heat and tracer) and deformation processes operative in principally the KTB site. The models and assumptions will be verified against experimental results both at a laboratory scale and at an insitu field scale. Predictive tools developed will be important for the design of the HDR system in Urach and in determining the importance of thermo-hydro-mechanical processes at the reservoir scale (e.g. consolidation during hydraulic testing and associated thermo-mechanical effects). The modelling approach is holistic including thermal, hydraulic and mechanical simulation components. The software development is based on our own object-oriented computer system GeoSys. The experimental program comprises heat and reactive tracer tests (push-pull-tests) for a quantitative characterization of the hydraulically active fracture and heat transfer system.