This seismicsource is a prototype. Please refer to the tool description for details.
Model id: SPWD wireline prototype
This source is part of an integrated seismic system. Please refer to the description.
Description: Integrated system for borehole seismics by wireline logging. The wireline probe includes a downholeprobe with source and receivers and a complementary surface acquisition system; Temperature rating: 85°C short-term, 60°C for longer periods; Pressure rating up to 200 bar (2900 psi); Length with cable head 7.5 m (transport and assembly in three sections); Max. diameter 7 ¾“ for application in 8 ½“ (expandable for 9 ⅝“ and 12 1/4” ) boreholes; Weight 750 kg; Coupling hydraulic by clamping unit; Contact surface 4 x 314 mm2 2 x 5625 mm2 2 x 4418 mm2; Contact force 4 x 1800 N 2 x 900 N 2 x 5500 N; Max. travel 25 mm 25 mm 35 mm; Logging cable: Hepta cable, 5500 m realized with adjustable isolating transformer; Supply voltage, frequency 110-250 Vac, 50 Hz; Power consumption 1000 VA max., 500 VA usually on duty; Surface system power supply 230 V, 16 A, 50 Hz; Adjustable isolating transformer Output 0-460 Vac, depending on cable length; System and source controll LabVIEW; Data aqusition downhole, direct access to downhole filesystem; Hepta cable adapter splitting up to power supply and telemetry, downhole trigger optional; Telemetry SHDSL Modem using two conductors; 2 Mbit/s on 3500 m cable, 300 kbit/s on 5500 m cable (tested); Tool orientation two 90° rotated LSR-14.5 single axis inclinometers and a KVH DSP-1750 single axis, magnetically shielded fiber-optical gyrocompass. Seismic sources: four magnetostrictive actuator as vibrator source, weight 1 kg each; amplitude and phase controlled arranged as Phased-Array; Bandwidth 100-5000 Hz; Interspace 280 mm; Seismic aquisition: two 3-component geophone heads (-> six Geo Space GS-14-L9 28 Hz); Interspace 2340 mm (750 mm to next vibrator source); AD-Converte 24-Bit Delta Sigma; Sample rate ¼ ms, 1/8 ms, 1/16 ms, 1/32 ms, 1/64 ms; Signal length 24 s, 12 s, 6s, 3 s, 1.5 s; Datatype SEG-2
|Type of seismic source:|
vibratorA source that generates seismic waves by vibration in countact with the ground or rock surface.
|Type of carrier:|
probeThe tool is mounted inside a probe.
direct linkTriggered via direct link.
|Usage conditons:||Only non-commercial research is allowed/welcome.|
|Additional usage conditions:||Logging as service by ICDP OSG|
|Additional specifications:||four magnetostrictive actuator as vibrator source, weight 1 kg each; amplitude and phase controlled arranged as Phased-Array; interspace 280 mm; Bandwidth 100-5000 Hz|
Operator and contact:
|Operator:||GFZ German Research Centre for Geosciences, Centre for Scientific Drilling|
|Contact person:||Rüdiger Giese|
|14473 Potsdam, Germany|