HT-ATES Project on TU Delft Campus - DEL-HTO-P01 Initial Borehole Dataset

This initial data release contains information collected from the pilot monitoring borehole DEL-HTO-P01, drilled as part of the High-Temperature Aquifer Thermal Energy Storage (HT-ATES) research project at the TU Delft campus. The borehole serves as a key observation and characterization point for understanding subsurface conditions and supporting the development of geothermal heat storage systems.The borehole DEL-HTO-P01 was drilled in April 2024 using reverse circulation drilling to a total depth of approximately 230 m below ground surface (mBGS). The borehole is designed both as a pilot well and as a long-term monitoring installation.The drilling program included the collection of geological, hydraulic, thermal, and geochemical data to characterize the subsurface formations, particularly within the Maassluis Formation, which represents the primary target for thermal energy storage.A total of 12 core samples were retrieved from selected depths between 75 m and 236 m, enabling detailed laboratory analysis of geological, mechanical, thermal, chemical, and hydraulic properties. In addition, drill cuttings were collected continuously at 1 m intervals throughout the borehole, providing a high-resolution lithological profile.This initial dataset includes:Drill cuttings analysisDrilling fluid measurementsRaw wireline logsWater quality samplingPumping test dataRaw and processed CT scan data from cores are published as a separate dataset.