An ultra‐high‐resolution 3D marine seismic system for detailed site investigation

• DOI: 10.3997/1873-0604.2017025
• Publication Date: 2019-09-17T20:45:22Z
• Authors: Olivier Monrigal; Ivan de Jong; Henrique Duarte
• Keywords: Economic geology; Environmental geology; Gemology

ABSTRACT Currently, marine ultra‐high‐resolution 3D surveys tend to be characterized by signal frequency ranges of 0–600 Hz and bin sizes the order 3 6 metres. This may acceptable in industry geohazard studies for top‐hole well drilling, but it does not have sufficient resolution very detailed information required geotechnical engineers design positioning turbine foundations offshore wind farms. We present a newly developed system, which takes 3D‐resolution 3D‐imaging one step further: up 2.5 kHz 1‐m sizes. system is based on an sparker source utilising negative discharge technology, thus guaranteeing stable repeatable signature. The high‐fidelity multi‐channel recording composed four 24‐trace streamers with GPS both sources receivers. Sophisticated navigation processing guarantees decimetre precision resultant In addition, slant streamer technology applied ensure broadband seismic response. Processing techniques, including critical corrections wave motion tides, been developed. Trial were conducted Thailand validate method later Croatia study shallow geology 2.5‐km bridge across sea inlet. cubes gave views subsurface allowing imaging stratigraphic structures small‐scale features, such as individual boulders boulder bed, that had hitherto identified.