Interest in direct use geothermal systems is increasing due to their ability to supply renewable, environmentally friendly heat. Such systems are mostly developed in conduction dominated geological settings where faults are often encountered. Interdependencies between physical, design and operational parameters make it difficult to assess the performance of such systems. Interaction with faults could potentially have adverse effects on system lifetime, generated Net Present Value (NPV) and produced energy. In this work a single doublet system in the enthalpy range of 140 kJ/kg to 350 kJ/kg is analysed using COMSOL Multiphysics. A choice of design (well spacing and placement), physical (layered reservoir, fault flow properties, fault throw) and operational (injection and production flow rates) parameters are considered in a full factorial design that includes 2430 3D reservoir simulations. Results show that fault flow properties characterization is more significant than fault throw structural characterization. For the considered reservoir properties, increasing the flow rate four times results in an NPV increase of a factor seven, despite the shorter system lifetime. A sealing fault renders the system lifetime less sensitive to the doublet positioning. Synthetic model results shown can serve as guidelines to reducing full scale field models. Importance and relevance of these results remains very high for horizontally homogeneous, layered reservoirs. The analysis expands the understanding of interdependencies for direct use geothermal systems and informs on their further development.

中文翻译：

---

断层热液储层直接利用地热的物理、设计和操作参数之间的相互依赖性

由于地热系统能够提供可再生、环保的热量，人们对直接利用地热系统的兴趣正在增加。这种系统主要是在经常遇到断层的传导主导的地质环境中开发的。物理、设计和操作参数之间的相互依赖性使得评估此类系统的性能变得困难。与故障的相互作用可能会对系统寿命、产生的净现值 (NPV) 和产生的能量产生不利影响。在这项工作中，使用 COMSOL Multiphysics 分析了焓范围为 140 kJ/kg 到 350 kJ/kg 的单个双峰系统。设计（井距和布置）、物理（层状油藏、断层流特性、在包括 2430 个 3D 油藏模拟的全因子设计中考虑了断层偏移）和操作（注入和生产流速）参数。结果表明，断层流特性表征比断层结构表征更显着。对于考虑的储层特性，尽管系统寿命较短，但将流速增加四倍会导致 NPV 增加七倍。密封故障使系统寿命对双合定位不太敏感。显示的合成模型结果可以作为减少全尺寸现场模型的指南。对于水平均质的层状储层，这些结果的重要性和相关性仍然非常高。