On 19 October 2018 the results of the Aker BP, Gekko appraisal wells (25/4-13 S and A) was reported by the NPD. Well 25/4-13 S was located on the south of the structure and encountered a 43 m oil and gas column in the Hemidal Formation of which 6.5 m was oil. Almost the entire interval comprised of very good to excellent reservoir quality sandstones. The gas/oil contact was recorded at 2,100 m and the oil/water contact was measured at 2,107 m (TVD). 24/4-13 S had its top hole section drilled between 6 and 18 June 2018. The well was re-entered on 15 September 2018 and drilled to a TD of 2,653 m (Hemidal Formation). Sidetrack well 25/4-13 A drilled north on the structure encountered a 30 m oil and gas column also in the Hemidal Formation of which 6 m was oil. Approximately 15 m of net reservoir was very good to excellent quality. The thickness of the oil zone is uncertain due to the variations in reservoir quality. 25/4-13 A was kicked-off on the 29 September 2018 and reached a TD of 2,641 m (Hemidal Formation). Drilling operations were undertaken by the âDeepsea Stavangerâ S/S and the wells have been plugged and abandoned. Following appraisal operations Gekko is thought to hold 9 MMbo and 173 Bcf (total of 38 MMboe recoverable). The licensees are considering a tie-back to the Alvheim FPSO.   Gekko was discovered in 1974 by Elfâs exploration well 25/4-3. The well proved a 3 m gas column plus a 5 m oil column in the Paleocene Heimdal Formation. In 2003 the discovery was appraised by Marathon with 25/4-8 which was located updip, approximately 1.7 km to the northwest of the discovery well. This well confirmed a 9 m gas column above a 7 m oil column in the Heimdal Formation and also encountered gas in the Paleocene Lista Formation. The NPD quotes recoverable reserves of 22 MMboe for Gekko (December 2016). Gekko is located across blocks 25/4 and 25/7 in PL 203.    Aker BP ASA operates PL 203 with a 65% interest. It is partnered by ConocoPhillips Skandinavia AS (20%) and Lundin Norway AS (15%).
025/04-13 S, A (Gekko) (Aker BP 65%, ConocoPhillips 20%, Lundin 15%) in PL 203 (Alvheim field area), P&A, Ã 025/04-13 S (southern flank of structure), 43m hc column in the Heimdal fm of which 6.5m oil, GOC at 2100m, PWC at 2106.5m