BroadSweep®— field
Signal management technology that simultaneously increases the resolution of seismic survey records and the depth of exploration..
Main purpose:
- To increase the reliability of inversion transformations, it is important to generate very low frequencies during excitation.
- BroadSweep spectra extended one octave to very low frequencies during field surveys reduce acoustic impedance prediction error by a factor of 1.25.
- The GDS-II system can generate broadband signals using standard vibration sources and receivers.
- In low-frequency vibration mode, the system automatically adjusts the impact force based on the capability of the hydraulic system of any vibration source.
- Vibratory excitation signals with spectral extensions to low and high frequencies can be used to obtain images of dynamic expressivity comparable to shot method. The frequency content of BroadSweep data is richer than that of shot data.
- Test results show a significant increase in the amount of information in the low-frequency range, improving the depth of the study and the contrast of the tectonic tomographic images.
Applications of BroadSweep ®Technology
1. Six octaves of BroadSweep® image. Lower Volga region
2. Octave filtering. Linear-frequency modulation (LFM) and BroadSweep®. Southern Urals
3. Comparison of fragments of pseudoacoustic impedance stacks at the level of the target interval. Southern Urals
4. Estimation of acoustic impedance prediction error. Southern Urals
Quantitative analysis of acoustic impedance prediction quality showed that in field studies using AViSeis®, Low-Dwell and BroadSweep® techniques, a one-octave extension into the very low frequency range reduced acoustic impedance prediction error. Pseudoacoustic transformations with minimal model influence (mimicking missing well information) were found to reduce acoustic impedance prediction error by a factor of 1.25.
5. Application of BroadSweep® technology. Vertical stacks. China
↑ Top
