SGD-SEL is a portable linear multichannel seismic station designed to carry out engineering geophysical surveys with methods of seismic reflection profiling, common depth point, microseismogram logging, vertical seismic profiling, crosshole seismic testing, MASW, seismic microzonation and to study upper part of the section. Shockproof construct, built-in control unit with a contrast display and tightly sealed special keyboard increase the reliability level and convenience of work with seismic station.
In addition to the standard sources of signal excitation in near-surface seismic survey (of “weight drop”, “sledgehammer”, “single-shot” types), the station supports operation with Geoton electrodynamic pulsed sources.
An important feature of seismic station is the availability of service data logging channels that allow recording the triggering pulse. When performing the postprocessing, the information from service channels can be used to correct time breaks.
| Number of channels | 24 or 48 |
| ADC | 24 bits |
| Instantaneous dynamic range | 105 dB |
| Gain | 1; 2; 4; 8; 16; 32; 64; 128 or 256 dB |
| Sampling period | 0.125; 0.25; 0.5; 1; 2 ms |
| Bandwidth | 0-199 (398, 796,1592 и 3184) Hz |
| Maximum record length | 340*2000 readings |
| Maximum signal amplitude at minimum gain | ±1.25 В |
| Inherent noise level | <0.15 µV |
| Nonlinear-distortions coefficient | <0.001 % |
| Mutual influence of channels | >110 dB |
| Common-mode rejection ratio | >100 dB |
| Operating temperatures | -30 ÷ +70 °С |
| Line control interface weight | 5.5 or 4 kg |
| Line control interface dimensions | 340х295х152 mm |
Are designed for induction of high-frequency seismic pulses during seismic surveys on water areas (FWS/SWS).
Stable impulse
Replaceable electrode groups
Adjustable depth
Designated cable
Stainless steel frame
Borehole sparker Pulse is utilized to generate pressure waves in water-filled boreholes while performing the operations via crosshole seismic testing (CST) and vertical seismic profiling (VSP) methods. The operation of the Pulse source is provided by the energy sources Jack.
The borehole source SHock is utilized to generate pressure (P-) and shear waves of horizontal polarization (SH-waves) in wells while performing the operations through crosshole seismic testing (CST) and reverse vertical seismic profiling (RVSP) methods. The energy source Jack is used as the source of energy.
