EGS Collab Testbed 1 Earth Model Input Files

The EGS Collab is conducting experiments in hydraulic fracturing at a depth of 1.5 km in the Sanford Underground Research Facility (SURF) on the 4850 Level. A total of eight ~60m-long subhorizontal boreholes were drilled at that depth on the western rib of the West Access Drift. Six of these holes are used for geophysical monitoring, one is used for hydraulic fracturing and the remaining hole was designed as a production borehole. In addition to these eight boreholes, 4 5-m Jack leg boreholes were drilled for housing geophones. This submission package includes various data type that were assembled to create Earth Models of the testbed. Note: The coordinate system used is local Homestake Mine Coordinate (HMC) system from an old gold mine that was in operation for over 100 years.

EGS协作组（EGS Collab）于桑福德地下研究设施（Sanford Underground Research Facility, SURF）的4850水平层，开展深度为1.5千米的水力压裂试验。研究团队在西出入平巷（West Access Drift）的西侧帮部该深度处，共钻进8个总长约60米的近水平钻孔。其中6个钻孔用于地球物理监测，1个用于水力压裂作业，剩余1个被设计为生产钻孔。除上述8个钻孔外，团队还钻进了4个5米长的支腿式钻孔（Jack leg boreholes）以安置检波器。本提交包包含各类数据，用于构建该试验基地的地球模型。注：本次采用的坐标系为拥有百余年开采历史的霍姆斯特克老金矿的本地坐标系（Homestake Mine Coordinate, HMC）。