Direct Use Geothermal Systems (DUGS) are increasing their installed capacity worldwide and denser developments with multiple doublets are becoming more common. Interference between doublets therefore becomes an additional concern to subsurface uncertainties. Faults can be either barriers or conduits to flow and can affect the fluid pathways inside the reservoir. The interference between two doublets that are separated by a fault has not been previously studied for DUGS. In this work considering subsurface uncertainty in a full factorial design using 5184 3D reservoir simulations we show that a fault can reduce the system lifetime of a two-doublet system by more than 40 % if one doublet is at close proximity to it. Further, we identify that the fault can also improve both the system lifetime and generated Net Present Value (NPV) with appropriate development decisions. Contrary to previous results that did not consider reservoir architecture, a tramline well configuration is preferable when the doublets have the fault in the centre, while a checkerboard configuration is preferable as the distance to the fault decreases. The Heat In Place (HIP) recovery shows a linear relationship with flow rate and well spacing that is not affected by the fault distance or flow properties. The dimensions of the Influence Area (IA) previously considered are insufficient to capture the temperature drop at the producer wells and the fault position can increase this discrepancy. Our results show the importance of fault characterisation and well positioning with respect to a fault considering subsurface uncertainty and how this can affect denser field development of DUGS. Our findings suggest to integrate faults and the relative positioning of well doublets with respect to a fault more strongly in field development plans. Such considerations should also be included in future optimization plans of multi-well geothermal systems. Moreover, the regulatory framework should be revised to achieve a better match between the IA boundary and the production well temperature drop to enable better planning for denser development of DUGS.

直接使用地热系统（DUGS）在全球范围内增加了其装机容量，具有多个双峰的密集开发也变得越来越普遍。因此，双峰之间的干扰成为地下不确定性的另外一个关注点。断层可以是流动的障碍或管道，并且可以影响储层内部的流体通道。以前尚未针对DUGS研究过被故障隔开的两个双峰之间的干扰。在这项工作中，使用5184 3D油藏模拟在全因子设计中考虑了地下不确定性，我们表明，如果一个双合点紧邻该断层，则该故障可能会使两个双合点系统的系统寿命缩短40％以上。进一步，我们发现，通过适当的开发决策，故障还可以改善系统寿命和产生的净现值（NPV）。与之前未考虑储层结构的结果相反，当双重岩心在中心处有断层时，电车井的构型是优选的，而随着断层间距离的减小，棋盘格的构型是优选的。热采（HIP）恢复显示出与流速和井距的线性关系，不受故障距离或流动性质的影响。先前考虑的影响区域（IA）的尺寸不足以捕获生产井的温度下降，断层位置会加剧这种差异。我们的结果表明，考虑到地下不确定性以及对DUGS的致密场发展有何影响，针对断层进行故障表征和井位定位的重要性。我们的发现表明，在野外开发计划中，应更强地整合断层和井双峰相对于断层的相对位置。这些考虑也应包括在将来的多井地热系统优化计划中。此外，应修订监管框架，以使IA边界与生产井温度下降之间更好地匹配，从而能够更好地规划DUGS的密集开发。我们的发现表明，在野外开发计划中，应更强地整合断层和井双峰相对于断层的相对位置。这些考虑也应包括在将来的多井地热系统优化计划中。此外，应修订监管框架，以使IA边界与生产井温度下降之间更好地匹配，从而能够更好地规划DUGS的密集开发。我们的发现表明，在田间开发计划中，应更强地整合断层和双井相对于断层的相对位置。这些考虑也应包括在将来的多井地热系统优化计划中。此外，应修订监管框架，以使IA边界与生产井温度下降之间更好地匹配，从而能够更好地规划DUGS的密集开发。