Abstract

The common goal for integrating geotechnics and geophysics is to increase the shallow sub-surface understanding for an area, making optimal use of each survey technique Important in this context is that the understanding of soil conditions between geotechnical sampling locations is increased by performing this integration. This paper presents two Statoil developments, Mikkel development and Kvitebjern Pipelines, where geophysics and geotechnics were successfully integrated in 2001. Performed work, results, benefits and experience are presented for both cases. For the Mikkel development the integration confirmed a similar soil stratigraphy as for the Midgard and Asgard fields. Unit thickness and variability were assessed with higher level of confidence because of a better regional understanding New recommended geotechnical design parameters could be established, based on the integration work, for repositioned templates without performing addition geotechnical surveys. The integration thus reduced costs and introduced a larger flexibility. The main benefit for the Kvitebjern Pipelines was that the pipeline designer had a continuous longitudinal soil profile with the appropriate geotechnical design parameters. The sampling locations were on average every 3 km along the pipeline route and the integration was therefore of great help to the pipelme designers. In addition, bedrock exposure could be mapped, important for pipeline design and pipeline laying

Introdution

Geotechnical and shallow geophysical surveys are performed for all offshore field developments The collected geophysical and geotechnical data can be integrated and examples of performed work vary from:

  • Pipeline and cable burial assessment studies.

  • Export pipeline studies, including bottom roughness assessments.

  • Geohazard studies, including regional understanding.

  • Shore approach studies, including depth to bedrock determination.

Numerous other examples can be added to this list The common goal for these different integration studies is to increase the shallow sub-surface understanding for an area, making optimal use of each survey technique. Important in this context is that the understanding of soil conditions between geotechnical sampling locations is increased by performing this integration.

Recent drivers in the offshore industry are contributing to the need of performing these integration studies.

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