Offshore Investigations

Geo has since 1989 performed geophysical and geotechnical site investigations in connection with the planning or construction of over 50 offshore wind farms.  Geo has accumulated extensive experience and knowledge in the field and are in some areas of the fieldwork industry leaders. 

For a number of years Geo has been involved in both small and larger site investigations for the offshore oil and gas sector. Geo’s accumulated experience and high HSE standards, enable Geo to participate in among other things work in close proximity of existing and live structures.

Geo possesses great experience within near- and offshore submarine pipelines and cables. Geo offers a wide range of services ranging from field surveys to assistance in the cable laying process and post laying documentation.

In connection to dredging, harbour building or related projects Geo can undertake the necessary fieldwork as well as the following analysis and reporting of data.

Geo utilizes a number of geophysical methods as possible part of the site investigation, including:

• Bathymetry Multibeam echosounding
• Sparker
• Pinger
• Side scan sonar
• Magnetometer

During or after the completion of fieldwork, Geo is able to deliver full reporting – including for example bathymetry charts in printed and electronic versions.

Geo owns and operates a number of in-house designed and built seabed rigs capable of performing various in-situ tests in the seabed – including CPT with measurements of pore pressure and soil specific sound velocities (seismic CPT).

GeoScope is Geo’s heavy seabed CPT-rig with a thrust capacity of 200kN. Penetration depth is subject to soil condition, and GeoScope has reached 50 meters in continuous push, in the North Sea,  

GeoCeptor is Geo’s combined CPT and Vibrocore seabed rig. It is capable of delivering 100 kN thrust for CPT, and take up to 6 m Vibrocores.

Geo also operates various smaller seabed CPT rigs especially suitable for operation requiring only shallow penetration – for example investigations related to pipelines and cable projects.

The seabed rigs can be mobilised on all suitable vessels. Throughout the previous three years, GeoScope has been mobilised a number of times on the DP1 vessel Blue Alfa.