Relinquishment Report for Licence Number P1471 Block 16/8f March 2009

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1 Relinquishment Report for Licence Number P1471 Block 16/8f March 2009 Endeavour Energy UK Ltd Relinquishment Report for Licence Number P1471 Block 16/8f 1

2 Table of Contents 1.0 Header Synopsis Exploration Activities Seismic Data Geological Studies Prospectivity Analysis Middle Jurassic Hugin Formation Triassic Skagerrak Formation Reserves Summary Clearance...10 List of Figures Figure 1: Block location and structural elements map...3 Figure 2: UK16/8a-10 CPI...5 Figure 3: South Viking Graben Stratigraphic Column...6 Figure 4: Hugin Formation Palaeogeography (approximately Mid Callovian)...7 Figure 5: NO15/5-2 Discovery CPI...8 Figure 6: UK16/8a-10 to NO15/5-2 Discovery Seismic Cross-Section...8 Figure 7: Top Triassic Depth (ft) with Prestwick area highlighted...9 Figure 8: Prestwick - Top Triassic Depth Map (ft)...10 Relinquishment Report for Licence Number P1471 Block 16/8f 2

3 1.0 Header Licence Number: P1471 Licence Round: 24th Licence Type: Traditional Block Number: 16/8f Operator: Endeavour Energy (UK) Ltd. 35% Partners: Lundin Heather Ltd 35% RWE 30% Work Programme Summary: Firm Commitment Reprocess 150 sq km of 3D seismic data (post-stack). Drill or drop Commitment Drill one well to a depth of 4,570m or 30m into the Triassic, whichever is the shallower, within two years of award. 2.0 Synopsis This report marks the decision to let this licence lapse at the end of the initial two year term. Block 16/8f is located in the axis of the South Viking Graben, east of the Brae Fields and adjacent to the UK-Norway Median Line ( Figure 1). Relinquishment Report for Licence Number P1471 Block 16/8f 3

4 Figure 1: Block location and structural elements map Prestwick is mapped as a large tilted fault block. At the time of application prospectivity had been identified primarily in the Triassic Skagerrak sands and additionally in the Middle Jurassic Hugin Formation. Geological work since the licence award has shown the Hugin Formation is not likely to be present on the Prestwick structure. On completion of the work programme the Prestwick prospect is still recognised by Endeavour and is calculated to have Pmean reserves of 186BCFE and a one in three chance of geological success. However, the economics are unfavorable for drilling a well (marginally HPHT) to test the prospect and the block has been relinquished. 3.0 Exploration Activities 3.1 Seismic Data Endeavour purchased the entire 35,000km 2 PGS MegaSurvey TM in order to review the prospectivity of the UKCS prior to the 24th Licensing Round. This 3D survey covers all of Block 16/8f and all adjacent Blocks including those in the Norwegian sector. Structural imaging across the greater 16/8f area is satisfactory; however, phase and signal/noise character of the individual input surveys is highly variable. As a means to a more balanced dataset, post-stack processing of 500km 2 of data was undertaken for noise conditioning and spectral imaging using ffa SVI Pro software. This re-processed data formed the basis for the interpretation effort. 3.2 Geological Studies A biostratgraphic study of the Middle Jurassic Hugin Formation was undertaken by Ichron Ltd. The study confirmed the likely absence of the Hugin Formation over the Prestwick structure. In-house regional geological studies of the Triassic reservoir have been undertaken and incorporated into the subsurface interpretation. 4.0 Prospectivity Analysis The UK16/8a-10 well drilled by Shell in 1988 lies within the licence but the well TDd in the Sleipner Formation about 60m before the Triassic. There were no shows recorded in the Sleipner Formation (Figure 2). The seismic to well tie is good and supports the TD of the well above the interpreted Top Triassic event. Relinquishment Report for Licence Number P1471 Block 16/8f 4

5 Figure 2: UK16/8a-10 CPI The Prestwick prospect is a large, un-tested, Triassic structure, comprising an overall twoway fault bound fault block, bound to the north by a down-to-the-northeast NW-SE extensional fault and to the east by an eastward vergent reactivation thrust. A narrow WSW-ENE pop-up zone associated with thrustal accommodation forms the crest of the structure. Proven reservoirs in the local area are the Triassic Skagerrak, Middle Jurassic Hugin and Ling Formations, Upper Jurassic Heather sands & Brae Formation, and Eocene Sele, Balder & Horda Formations. The Triassic Skagerrak Formation is the primary reservoir for Prestwick (Figure 3). At the time of application the Hugin Formation was also carried as a secondary reservoir. Relinquishment Report for Licence Number P1471 Block 16/8f 5

6 Figure 3: South Viking Graben Stratigraphic Column 4.1 Middle Jurassic Hugin Formation The Hugin Formation forms the reservoir in the J1 discovery to the south of Block 16/8f, in the Dagny and Ermintrude complex to the southeast and in the giant Sleipner East and West Fields further to the southeast. The biostratigraphic analysis undertaken by Ichron Ltd shows that the on-block well UK16/8a-10 drilled Heather shales that are diachronous to the Hugin Formation (Figure 4). NO15/5-2 discovery well lies 7km to the east of Prestwick and also encountered Heather shales. Both of these wells lie in a more basinal position to the Hugin Formation shoreface sands and it is therefore unlikely that the Hugin Formation is present on the Prestwick structure. Seismic mapping of the top Hugin reflector from the J1 structure northwards to the Prestwick crest, indicates a substantial thinning of potential section, increasing the likelihood that the Hugin Formation is absent over Prestwick. Relinquishment Report for Licence Number P1471 Block 16/8f 6

7 Figure 4: Hugin Formation Palaeogeography (approximately Mid Callovian) 4.2 Triassic Skagerrak Formation Triassic Skagerrak Formation sandstones form the reservoir in offset fields, notably in the NO15/5-2 discovery that lies 7km to the east of Prestwick, in the Crawford Field to the north of Prestwick, and in the Loke, Gungne and Sigyn Fields on the Sleipner Terrace in the Norwegian sector. The Skagerrak Formation sediments consist of alluvial plain, sheetflood dominated major ephemeral streams and major braid plain channel stream complexes. These give rise to thick homogeneous sandy and silty successions with an overall coarsening up sequence. The NO15/5-2 discovery drilled 186m of Triassic before TD. Petrophysics shows 86m of this is net sand with a net to gross of 46% ( Figure 5). The average porosity is 15%. The well encountered an 18m gas-condensate column at the top of the Triassic with an average hydrocarbon saturation of 60%. A DST was performed and the well flowed at a maximum rate of 10.74mmscf/d gas and 110.8bpd condensate. The overall hydrocarbon column for the discovery is approximately 450m. Endeavour s reserve estimate for the discovery is in line with the Norwegian Petroleum Directorate s reserves of 173BCF. Relinquishment Report for Licence Number P1471 Block 16/8f 7

8 Figure 5: NO15/5-2 Discovery CPI Figure 6: UK16/8a-10 to NO15/5-2 Discovery Seismic Cross-Section Relinquishment Report for Licence Number P1471 Block 16/8f 8

9 Seismically, the Triassic section in NO15/5-2 is fairly homogenous in nature and little in the way of reflectivity occurs. A tie-line between this well and UK16/8a-10 (Figure 6) illustrates a similar scenario at Prestwick, albeit potentially a more interbedded reservoir section. Scoping rock physics interpretation has precluded the possibility of delineating hydrocarbon bearing section. Top Triassic depth maps for the semi-regional area Prestwick specific are presented in Figure 7 and Figure 8 respectively. About 70% of Prestwick lies on block (Error! Reference source not found.). Prestwick has a structural crest at 14,830ft (4,520m) TVDSS and lowest closing contour at around 17,400ft (5,304m) TVDSS. Pmean reserves are calculated to be 186BCFE. The structure has a large vertical relief and requires a large hydrocarbon column. The chance of geological success is 34% with containment being the key geological risk Top Triassic km Figure 7: Top Triassic Depth (ft) with Prestwick area highlighted Relinquishment Report for Licence Number P1471 Block 16/8f 9

10 Figure 8: Prestwick - Top Triassic Depth Map (ft) 5.0 Reserves Summary Prestwick is marginally HPHT and therefore has a high drilling cost. Prestwick reserves are seen as sub-commercial by the Group. No other prospectivity is seen within the licence and therefore the Group elects to drop the block. 6.0 Clearance Endeavour confirms that DECC is free to publish and that all third party ownership rights (on any enclosed data/interpretation) have been considered and appropriately cleared for publication purposes. Relinquishment Report for Licence Number P1471 Block 16/8f 10

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