There are always three phases in an Offshore Site Investigation. We begin with desk study, then we proceed with a geophysical survey and before finalizing any design we perform specific site investigations.
1.1. Desk Study
- Scientific literature, internet
- Admiral charts
- Geological maps/profiles
- exploration geophysical data
- data from the installation nearby structures
- data from nearby geotechnical investigations
From the desk study it is possible to get a general idea about
- the general geology
- seabed obstacles
- approximate bathymetry
- geohazards
- general met-ocean
- recommendations for site investigation
1.2. Geophysical Survey
- Echo Sounding –> for detail bathymetry
- Side Scan –> to locate seabed features
- Seismic Reflection –> sub-bottom stratigraphy
- Magnetometer survey –> magnetic anomalies
1.3. Geotechnical Site Investigation
- In situ tests (CPT, vane test, pore pressure)
- Laboratory testing