The borehole source SBS1000 is designed for P-wave tomography between boreholes up to 1000 m depth. The SBS1000 consists of three parts housing the complete high-voltage power supply for charging up to about 3 KV. The source can be connected to a GO-4 cable head and a standard logging unit (4-conductor cable). The unit is powered from surface by means of a 230 VAC power supply.
| Generated wave type: | P |
| Signal frequencies: | Up to 5 kHz (depending on geology and borehole distance) |
| Operational depth: | Up to 1000 m |
|
Impulse voltage: |
3200 V |
|
Power supply at surface: |
230 VAC |
| Source diameter: | 70 mm |
| Total source length: | 4.30 m |
| Source length of each high-voltage tubes: | 1.02 m (with 0.53 m connecting hoses) |
| Borehole diameter: | Min. 80 mm |
| Signal transmission: | 4-conductor logging cable |
| Communication: | PCL boards |
| Cable head: | GO-4 |
| Special features: | Test trigger, emergency OFF button, power consumption/voltage/communication control, impulse counter |
The digital hydrophone string BHC1000 is a fully digitized borehole receiver unit running on 4-conductor logging cable.The BHC1000 consists of max. 24 hydrophones moulded to a multicore cable. A digitization unit is placed on top of the string and can be connected to the standard 4-conductor logging cable. At surface a control unit is connected to the logging winch and directly to laptop.
| Downhole Unit |
|
| Hydrophone sensor: | SQ54 |
| Pre-Amplification: | 4x |
| Operational depth: | up to 1000m |
| Number of hydrophones: | 24 |
| Max. pressure: | 100 bar |
| Temperature range: | 0-70 °C |
| Digitizer length: | 70 cm |
| Digitizer diameter: | 57 mm |
| Borehole diameter: | Min. 70 mm |
| Depth indicator: | Via logging winch |
| Signal transmission: | 4-conductor cable |
| Cable head: | GO-4 |
| A/D conversion: | 24 bit |
| Sampling frequencies: | 250-48000 Hz |
| Trace length: | 65000 samples |
| Surface Unit |
|
| Power: | 12 V DC |
| Weight: | 3 kg |
| Communication: | 2 wire RS-485 |
| Downhole electronics: | DSP = Blackfin 548,64 MB SDRAM |
| Trigger: | Piezo, switch, TTL |
| Auxiliary channel: | 4 |