This novel acquisition and processing method is currently under development in our R&D unit. The eSeismic method utilizes continuous source and receiver wavefields to produce broadband subsurface images.
The continuous sources wavefields can be generated with either marine vibrator technology or with traditional air gun hardware. When the continuous signals are generated by air guns, the individual guns are fired with very small randomized intervals, instead of triggering an entire source array.
- Environmental: Peak sound pressure levels (SPL) can be significantly reduced by distributing the emitted signals from the sources in time
- Environmental: Sound exposure levels (SEL) integrated over time can also be reduced
- Efficiency: There are no speed limitations since the method does not require the seismic recording or the sources to be triggered with specific spatial intervals, and since no listening time is needed
- Efficiency: Rapid coverage of the target during acquisition by operating several sources simultaneously, and increasing the spread width of the sources
- Data quality: Potential uplifts related to the continuous wavefields and to the spatial sampling of source positions. Imaging of low-frequency signal benefits especially from the long records.
eSeismic is a Demo2000 project funded by The Research Council of Norway, Equinor (formerly Statoil), and PGS.
A time-slice from preliminary migrated results of a field trial survey demonstrating high signal to noise levels and the ability of the proposed novel acquisition method to resolve fault boundaries in great detail aided by the significant increase in spatial source sampling.