Surpassing expectations

Horizon Geosciences’ revolutionary, 200kN Seabed CPT system has been used with great success on a complex geotechnical site investigation for Vattenfall, offshore Denmark


Horizon Geosciences’ revolutionary, 200kN Seabed CPT system has been used with great success on a complex geotechnical site investigation for Vattenfall, offshore Denmark. Horizon’s scope of work centred around turbine locations in the North Sea windfarm as well as infield cable routes. The programme of work included downhole sampling and CPT testing, seismic CPT testing, pressuremeter testing, P-S Logging, vibrocoring and seabed CPTs.

Horizon’s digital CPT System is designed to achieve a continuous profile to depths in excess of 40m into the ground. Senior Project Manager for Horizon Geosciences Limited, John Cudden highlighted the importance of this feature: “Building an accurate ground model is crucial to the development of offshore wind farms, therefore a high volume of quality CPT data is needed, often within tight timescales. This is where Horizon’s 200kN CPT can surpass traditional drilling expectations in terms of production and cost. Coupled with the ability to conduct seismic CPT tests with this seabed system, tied in to pressuremeter and borehole logging data from adjacent boreholes, we provide the data for the full determination of both lateral and horizontal engineering properties across the site.”

The 200kN Seabed CPT System can be deployed from any DP1 or DP2 vessel, the Horizon Geobay was assigned in this case due to her full Geophysical and Geotechnical spreads, containerised laboratory and capacity to operate in shallower waters.