Borehole sources

Sources for IPG5000

Two different types of sources can be connected to the same power supply IPG5000 which supplies both P- and S–wave source with energy of 5000 V.


 

P-wave

SBS42 | P-Wave Source

The borehole source SBS42 generates compressional waves (P) in water filled boreholes. The seismic signals are highly repeatable. Energy released by the IPG5000 discharges through a coaxial cable terminated by two adjacent spark electrodes. The spark discharge vaporizes water by a high-pressure plasma. This generates vapour bubbles which expand and collapse, thereby generating high-frequency seismic waves.

sbs42

Generated wave types: P
Signal frequencies: Up to 5 kHz (depending on geology and borehole distance)
Operational depth: Up to 400 m
Source length: 645 mm
Source diameter: 45 mm
Source weight: 3.8 kg
Cable weight per metre: 206 g
Cable strength: 3400 N
Borehole diameter:  Min. 50 mm
Clamping system: Not required
Depth indicator: Cable marking every 2 m
Connector: To Impulse Generator IPG5000
Storage: On drum

 

S-wave

BIS-SH | S-Wave Source

The borehole source BIS-SH generates horizontally polarized shear waves (SH) and compressional waves (P). The seismic signals are highly repeatable. The source works in dry or water filled boreholes and can be used in vertical or horizontal boreholes.

Energy released by the IPG5000 discharges through a system of electromagnetical coils adjacent to a copper plate. If the plate is rejected a mechanical impact to the borehole wall is generated. The borehole source is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). The orientation of the source is controlled from surface by a torsionally stiff hose.

bis sh

Generated wave types

SH/P

Signal frequencies:

Up to 4 kHz (depending on geology and borehole distance)

Operational depth:

Up to 100 m

Source length:

880 mm

Source diameter:

65 mm

Source weight:

8.5 kg

Cable weight per metre:

665 g

Borehole diameter:

75 - 100 mm (or larger if spacers are used)

Clamping system:

Inflatable bladder

Orientation:

Torsionally stiff hose

Depth indicator:

Cable marking every 2 m

Connector:

To Impulse Generator IPG5000

 


P-wave data examples

Soft rock

Borehole spacing: 25 m

P wave softRock 25m 

Borehole spacing: 100 m

P wave softRock 100m

Hard rock

Borehole spacing: 45 m

P wave hardRock 45m 

Borehole spacing: 100 m

P wave hardRock 100m

 


S-wave data examples

Soft rock

Borehole spacing: 4 m

S wave softRock 4m 

Borehole spacing: 25 m

S wave softRock 25m

Hard rock

Borehole spacing: 5 m

S wave hardRock 5m 

Borehole spacing: 20 m

S wave hardRock 20m

Source for IPG800

The impulse generator IPG800 is developed to supply energy of 800 V only to the smaller S-wave source type.


 

Source

BIS-SH-DS | S-Wave Source

The borehole source BIS-SH-DS generates horizontally polarized shear waves (SH) and compressional waves (P). The seismic signals are highly repeatable. The source works in dry or water filled boreholes and can be used in vertical or horizontal boreholes. Energy released by the IPG800 discharges through a system of coupled coils. They generate a mechanical impact to the borehole wall that releases seismic waves.

The borehole source is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). The orientation of the source is controlled from surface by a torsionally stiff hose.

BIS SH DS

Generated wave types:

SH/P

Signal frequencies:

Up to 4 kHz (depending on geology and borehole distance)

Operational depth:

Up to 60 m

Source length:

880 mm

Source diameter:

65 mm

Source weight:

8.5 kg

Cable weight per metre:

665 g

Borehole diameter:

75 - 100 mm (or larger if spacers are used)

Clamping system:

Inflatable bladder

Orientation:

Torsionally stiff hose

Depth indicator:

Cable marking every 2 m

Connector:

To Impulse Generator IPG800

Storage:

On drum

 


S-wave data examples

Soft rock

Hard rock

Borehole spacing: 3 m

S wave BIS DS softRock 3m 

Borehole spacing: 5 m

S wave BIS DS hardRock 5m