Novel seismic spread used on offshore Ireland survey

Petroleum Geo-Services (PGS) has completed its first full-scale simultaneous acquisition of towed streamer electromagnetic (EM) data and 2D GeoStreamer seismic.

Offshore staff

OSLO, Norway – Petroleum Geo-Services (PGS) has completed its first full-scale simultaneous acquisition of towed streamer electromagnetic (EM) data and 2D GeoStreamer seismic.

The multi-client survey over licensing options 13/1 and 13/23 offshore southern Ireland comprised around 3,000 line km (1,864 mi) of seismic and towed streamer EM data. It was acquired during four weeks this summer in the Fastnet and Celtic Sea basins.

According to PGS, the towed streamer EM system maps subsurface resistivity, leading to improved understanding of subsurface structures. High resistivity is associated with oil and gas accumulations. The technique can also be used to detect basement, carbonate, and salt layers.

Exploration activity is increasing over the Celtic Sea, Fastnet, and South Celtic Sea basins, but existing seismic data in this region is generally of poor quality, the company says, and focused primarily on Upper Jurassic and Lower Cretaceous plays.

The new survey should confirm the presence of deeper targets, and the GeoStreamer 2D data should improve resolution of shallower formations, including ties to the 400-MM barrelBarryroe field.

11/14/2013

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