Overcoming severe imaging challenges in the Central North Sea.

Cornerstone OBN Phase 1 is part of a larger program to re-image the prolific and most challenging region of the UK Central North Sea (CNS). A combined effort of Magseis Fairfield and CGG, this survey will provide full-azimuth data for field development and near-field exploration, and will be available Q1-2021.

OBN Cornerstone phase 1

While OBN data acquisition is generally used to achieve high-resolution images of complex structures, survey size is no longer limited to the standard node patches deployed for 4D monitoring. Imaging of complex structures, such as salt diapirs, requires an extended shooting area around the deployed nodes. Additionally, a large full-azimuth OBN survey will allow a more comprehensive analysis of the lateral extension of complex structures adjacent to the target area. We designed Cornerstone Phase I with these factors in mind.

Despite the uplift in subsurface images brought by dual- and multi-azimuth streamer surveys and the latest imaging technology, there are specific scenarios where the technical limitations of what can be achieved by towed-streamer data have been reached. Overcoming the toughest challenges of the CNS, such as complex salt diapirism or deep reservoir characterization in structures beneath the Base Cretaceous Unconformity, requires full-azimuth and long-offset OBN data.

The geographical area of this hydrocarbon-rich province is vast and presents severe imaging challenges. Overcoming them requires multi-azimuth and long offsets. Magseis Fairfield and CGG are committed to delivering this exceptional data and already have plans in place for a multi-year campaign to fully cover the area.

During data processing, CGG will apply the most advanced processing algorithms available, making the data ideal for field development and near-field exploration. Cornerstone OBN data will provide:

  • Multi-azimuth data
  • Long offsets
  • High fold
  • P-P and P-S data

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For more information on this or any of our Multi-Client programs, please contact our Multi-Client team.

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