Microseismic downhole network - Soultz-sous-Forêts 2003 Stimulation

Description

The downhole seismic network in 2003 consisted of three 4 component accelerometers built by the CSMA and three Calidus type high temperature 3-component geophone receivers. The accelerometers in boreholes 4550, 4601 and OPS4 were placed as they were during the monitoring in 2000. Two geophones were deployed in EPS1 and GPK1.

Another geophone was tested in borehole 4616 during the monitoring. This was first connected to the acquisition system at 17:30 20th June. At that time the sensor was on the surface. The tool was deployed onto the bottom of 4616 on 17th July.

The detection of seismic events was performed by triggering. Each recorded signal has a duration of 5 s.

The X,Y,Z coordinates in the file refer to the local coordinate system with the GPK1 wellhead as origin:
X: Easting in meters from GPK1 wellhead (toward UTM32 East)
Y: Northing in meters from GPK1 wellhead (toward UTM32 North)
Z: Depth in meters from GPK1 wellhead
The local coordinate system is based on the UTM32 system.

The coordinates of the stations in the local coordinate system have been obtained from the Semore Seismic report for Socomine by B.C. Dyer et al., 2004 (Soultz GPK3 stimulation and GPK3-GPK2 circulation May to July 2003. Seismic monitoring report).

The latitude, longitude and elevation in the WGS84 coordinate system have been derived from the local coordinate system.