DAPGEO-02 Multi-Purpose Research Borehole
DAPGEO-02 is a multi-purpose research borehole, which is part of the seismic monitoring network of the geothermal research project on TU Delft Campus.
The borehole DAPGEO-02 makes up the central location of seismic monitoring of the geothermal doublet. It was drilled to a total depth of 499 m between February and May 2022 and equipped with geophones at 440m and 490m depth for seismic monitoring. This allows a higher sensitivity and lower noise levels than the geophones present in the doublet wells. Adjacent to it lays a borehole of 200 m depth and two shallower wells 100 m offset from the central borehole. This local monitoring network has been equipped with optical fibres which connect the boreholes laterally and are also placed downhole. A total of 87 cores have been collected of which 18 cores are from the Maassluis Formation (between 115 and 225 m depth) and 69 cores are from several Paleogene Formations (between 362 m and 415 m depth). Open-hole wireline logging was conducted in three phases from which various types of geophysical logs were collected:
- Electrical Resistivity (RES)
- Total Gamma Ray (GR)
- Spectral Gamma Ray (SGR)
- Spontaneous Potential (SP)
- Single-Point Resistance (SPR)
- Induced Polarization (IP
- Sonic P-wave Velocity (SON)
- PS Suspension Log (PS)
- Nuclear Magnetic Resonance (NMR)
- Borehole Deviation (DEV)
- Electromagnetic (EM) induction (IL)
- Acoustic Borehole Imaging (ABI)
The digital data obtained from this well can be found here:
