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GEOTOMOGRAPHIE
SPARKER SEISMIC SOURCES |
 click on an item to view its' specifications |
The
Geotomographie sparker seismic source system consists of a surge
generator, a control unit, and five
different sources. Sources include downhole P-wave,
S-wave, drilling,
and auger types and a surface
unit.
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Sparker pulses are released through manual or automatic
triggering of the surge generator by the FBG-2 remote control unit.
The remote control unit also converts the reference signal of the surge
generator into a trigger signal. The background noise can be recorded
automatically and used to interrupt data aquisition if the noise level
is too high.
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The surge generator SWG 505-S supplies the power to
operate the various sources under the control of the FBG-2 remote controller.
The SWG 505-S surge generator supplies impulse voltages of 3, 4, or
5 thousand volts. Impulse energy is 360, 640, or 1000 watt seconds.
Repetition rates from 4 to 7 seconds. Requires power supply of 120 or
220 VAC at 580 Watts.
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The downhole p-wave sparker SBS-36 consists of a probe
tube and a rubber tube system. At the probe tube a plastic protection
housing is attached. Inside the housing a rubber chamber filled with
water surrounds the sparker electrodes. The electrical discharge occurs
within the chamber. A pulling rope is attached at the borehole probe
for recovery.
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The s-wave sparker SH-100 is a combination of the
SBS-36 and a pneumatic clamping device to generate horizontally polarized
shear waves. The sparker is pressed to the borehole wall using the clamping
device which can be manually triggered. A light weight pipe attached
to the sparker makes it easy to rotate the source downhole. A compass
helps to find out the optimal direction of the source between the boreholes.
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The auger source IBS 36 consists of a combination
of the SBS 36 and a auger device. It allows sound generation by the
IN-Bit Source method The seismic source is placed between the auger
string and the coring device. The high voltage cable is permanently
connected to the source and has to be pulled through the auger string
before operating.
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The drilling source IBS 50 consists of a combination
of the SBS 36 and a shallow drilling unit. The source is placed above
the drilling tool to generate seismic pulses at the borehole wall. During
drilling there is no connection between the source and the high voltage
cable. While the drilling is stopped to change the drill pipe, a special
connector can be lowered and connected to the source to generate the
seismic signals.
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The surface sparker SDA consist of a combination of
the SBS 36 and a modified sparker housing to generate seismic signals
at the surface. The SBS 36 is placed in a special cylindric resonance
tool having a high reaction mass. The tool is filled with water. A rubber
plate at the bottom enables a good surface contact. The surface sparker
can be easily moved from one place to another with a simple lifting
device.
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SPECIFICATIONS: REMOTE UNIT FBG 2: Power supply 24VDC 15mA, Trigger circuit
4.5V 2mA (batteries) Dimensions: 308 x 206 x 163mm, Weight: 3.5 Kg |
Back to seismic index Call GISCO / 1-800-523-1526 (952-929-8000)
FAX 952-926-5498 / EMAIL:sales@giscogeo.com
