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

对热、水力和地质力学过程(可能是耦合的)进行量化，对于理解和描述地质系统中的自然和人为过程是非常重要的。本项目的总体目标有两个：利用计算机模拟和实验技术分析深部结晶岩石的过程。模拟技术将用于实验设计以及流动、运输和变形过程的一般分析，最终用于地热储集层行为的长期预测。我们尤其感兴趣的是水库规模的热-流体力学过程的影响(例如，水力试验期间的固结和热-机械效应)。建模方法是整体的，即它包括热(RFHTM)、液压(RF-SM)和机械(RM-DM)仿真组件。软件开发基于自己的面向对象计算机系统RockFlow/RockMech(RF/RM)。实验方案包括示踪剂试验(热和反应示踪剂)，以及随后的水力刺激试验。示踪剂实验旨在定量描述水力活动裂缝系统。将进行模拟试验，以改善深部岩石的水力渗透性，最终增加地热能的利用潜力。其他工作组也可以使用整体模型方法，他们可以使用所有可用的数据来重新校准和比较模型，并提高模型的可预测性。在这个项目中，它打算开发一种建模和实验技术，该技术也将用于其他地热地点的调查(例如乌拉赫)。

Quantification of thermal, hydraulic and geomechanic, probably coupled, processes is very important for the understanding and characterization of natural as well as man-made processes in geosystems. The general target of this project is twofold: The analysis of processe in deep crystalline rock by employing computer modeling and experimental techniques. Modeling techniques will be used for experimental design as well as the general analysis of the flow, transport and deformation processes and finally for long-term preditions of geothermal reservoir behavior. In particular we are interested in the impact of thermo-hydromechanical processes at the reservoir scale (e.g. consolidation during hydraulic testing and thermo-mechanical effects). The modeling approach is holistic i.e. it includes thermal (RFHTM), hydraulic (RF-SM) and mechanical (RM-DM) simulation components. The software development is based on the own object-oriented computer system RockFlow/ RockMech (RF/RM). The experimental program comprises tracer tests (heat and reactive tracer) and later on hydraulic stimulation tests. The tracer experiments are intended for a quantitative characterization of the hydraulically active fracture system. Stimulation tests will be conducted to improve the hydraulic permeability in deep rocks, finally, to increase the potential for geothermal energy utilization. The holistic model approach is accessible to other work groups, who can use all available data to re-calibrate and compare models and to improve its predictability. Within this project it is intended to develop a modeling and experimental technology that will be useable for the investigation of other geothermal sites (e.g. Urach), too.