2D seismic survey aims to clarify prospectivity in North Celtic Sea

Offshore staff

LONDON – A consortium of GeoPartners, Russian contractor MAGE, Seabird Exploration, and DownUnder GeoSolutions has started acquiring the North Celtic Sea 2015 multi-client 2D seismic survey.

The Ireland/UK cross-border project will mostly cover the Irish North Celtic Sea and St Georges Channel.

Acquisition began last month using the MAGE vessel Nikolay Trubyatchinsky (ex-Polar Explorer). The consortium plans to acquire up to 6,000 km (3,728 mi) of long offset broadband data, the aim being to provide an extensive regional data-set which is said to be lacking in this area.

Dip lines have been planned to complement vintage data and a strike-line orientation has been designed to minimize side-swipe from faults.

This area of the Celtic Sea and UK Western Approaches has been little explored at pre-Cretaceous levels, but is thought to hold potential in the Jurassic and Triassic sequences which few wells to date have penetrated.

There is a proven Liassic source rock and potential reservoirs including the Triassic Sherwood sandstone and Jurassic limestone and sandstone. Locally, the carboniferous could provide a gas source from coal measures and a potential oil source from the Bowland shale, as evidenced in the Hamilton field in the Morecambe Bay offshore northwest England.

The survey will provide ties to most of the wells drilled in the survey area, including:

  • UK 106/24-1 which had live oil shows in Middle Jurassic Bathonian limestones and sandstones.
  • The IRL 49/9-2 Helvick oil discovery which flowed light oil (44° API) at a cumulative rate of around 10,000 b/d from Middle Jurassic Bathonian limestones and Upper Jurassic sandstones.
  • UK 103/1-1 Dragon gas/condensate discovery drilled by Marathon off West Wales, which flowed 21 MMcf/d from Upper Jurassic sandstones.

DownUnder GeoSolutions will perform broadband imaging using its de-ghosting solution, DUG Broad. Processing is expected to be completed in January 2016.

08/11/2015

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