Commercial in Confidence. © 2008 OHM Ltd Rockall Margin Multi-client Campaign Project Planning Preliminary Survey Design August 2008

Commercial in Confidence. © 2008 OHM Ltd Introduction  2009 Rockall Licensing Round –Acreage in the Rockall Basin is to be offered by the PAD –The round will open Q and close Q  The Rockall Basin is extremely under explored, but offers significant prospectivity, within a vast area open for licensing  OHM and Hannon Westwood are offering the opportunity to significantly reduce the risk of the identified prospectivity ahead of the license round 2

Commercial in Confidence. © 2008 OHM Ltd Survey design  OHM have again teamed up with a company that can provide local geological information and defined prospects  This ensure that OHM’s multi-client surveys are: –Correctly positioned for key prospectivity –Technically designed for the survey specific challenges. 3  Hannon Westwood is an Oil and Gas intelligence and consulting company, established in the UKCS for 15 years.  Through Hannon Westwood’s Gmatrix Ireland product, and Atlantic Margin knowledge, OHM have been able to target the key areas of prospectivity for the license round.

Commercial in Confidence. © 2008 OHM Ltd Overview of survey locations and identified prospectivity 4 Corrib Triassic Rockall Basin Porcupine Basin Burren L. Cretaceous Spanish Point U. Jurassic Connemara U. Jurassic Slyne Basin Erris Basin Donegal Basin Dooish M. Jurassic Prospect/ Lead outlines Area of 2008 Rockall Licensing Round Survey A Survey B Survey C Survey D Survey E

Commercial in Confidence. © 2008 OHM Ltd 5 65km 55.5km Survey A 3km Receiver Spacing 1.5km

Commercial in Confidence. © 2008 OHM Ltd 6 Survey B 3km Receiver Spacing 1.5km 65km 55.5km

Commercial in Confidence. © 2008 OHM Ltd 7 Survey C 3km Receiver Spacing 1.5km 65km 55.5km

Commercial in Confidence. © 2008 OHM Ltd 8 Survey D 3km Receiver Spacing 1.5km 65km 55.5km

Commercial in Confidence. © 2008 OHM Ltd 9 Survey E 3km Receiver Spacing 1.5km 65km 55.5km

Commercial in Confidence. © 2008 OHM Ltd Timing 10  In order for OHM to deliver results in time for the license round, OHM would need a suitable level of pre-commitment by the end of August ‘08  Acquisition will commence in September ‘08  Results delivered early Q  70% will be invoiced upon agreement, with 30% upon delivery  Horizontal electric field survey data  Processed CSEM horizontal electric field data  Acquisition report  Processing and interpretation report  Sub-surface resistivity interpretation –Delivered in SEGY –Processed and interpreted in OHM 3D centre of excellence, KL Deliverables