Discovered in 2012, Cormorant East has produced oil from the Brent Sandstone since January 2013. The 2019 work programme included replacement of ESP’s in CN07. The field has produced steadily since intervention.
The Skua Field (re-named Murlach) was originally produced between 2001 and 2005 via a single subsea well tied back to ETAP. This well produced over 10mmboe at rates of up to 15,000boepd from the Triassic sandstone reservoir. BP and Zennor are working on a field re-development (again subsea tied back to ETAP), and are targeting both attic oil and undrained volumes in a southern extension, using 4D seismic mapping
The Ruvaal Prospect is located east of the Skerryvore licence. It is a Palaeocene stratigraphic target and exhibits a potential DHI within the Mey Sandstone that is similar to that seen over the Skerryvore feature, and in the nearby Talbot Field.
The Fisher prospect is located south of the Finlaggan Field and comprises an undrilled Fulmar Sandstone trap on the north slope of the Forties Montrose High. The prospect has been mapped on the same low noise GRT migrated seismic data that led to the development of Finlaggan.
The Leverett discovery is located to the northwest of the Brodgar Field, and is delineated by four wells that all encountered condensate-bearing Lower Cretaceous Britannia Sandstone. Improved seismic definition combined with knowledge gained from the Finlaggan field has given Zennor encouragement that Leverett could be tied back to Britannia. The Greenwell Prospect is an extension of the Palaeocene Callanish Field, which has produced 58mmbo in the last nine years. Greenwell exhibits the same DHI response as Callanish and lies immediately to the northwest of the field. Drilling on either the Greenwell Prospect or the Leverett Discovery had been anticipated 4Q2020, but has been delayed. Meanwhile, planning for a pilot hole and horizontal side-track on Greenwell and a vertical appraisal for Leverett is ongoing.
The Courageous Discovery well was drilled in 1971 and discovered volatile oil and gas within a series of thin, distal Palaeocene turbidite sandstones. Imaging of the thin sandstones on 3D seismic is challenging. Ithaca and Zennor are working towards making a development decision for this complex hydrocarbon accumulation which has significant in-place volumes.
The Skerryvore Prospect is located on the flanks of a salt diapir. The prospect has a stacked target. The primary target comprises a large untested chalk anomaly on 3D seismic. This underlies a potential DHI within the Palaeocene Mey Sandstone, which is analogous to the Talbot Field to the north
This Rutford Prospect lies to the northeast of the Leverett Discovery in P2350. It is a seismically defined feature exhibiting a potential DHI within the Lower Cretaceous Britannia sandstone. It represents a potentially-attractive add-on to the Leverett development.
Finlaggan is located to the south of the Britannia Field. Originally discovered by ConocoPhillips in 2005, Zennor drilled the Finlaggan appraisal well and side-track (21/5c-7, 7Z) in 2016. The side-track was tested and flowed at 40mmscfd of gas and 3,120bbls/d of condensate. In 2017, Britannia was selected as the offtake route, which will be produced by a two-well subsea tie back. The FID decision followed in 2018, with commencement of drilling operations in July 2018 and FDP approval in October 2018. Laying and trenching the pipeline to Britannia has now been completed. On the 12th October 2020, Zennor announced the completion of the Finlaggan sub-sea manifold installation. At year end, the Finlaggan development project will be over 90% complete and on target for first production in Q4 2021 following the rescheduled Forties Pipeline System shutdown in Q2 2021.
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The Bacchus Field is located 6.5kms from the Forties Alpha Platform. Bacchus has been producing oil from the Jurassic Fulmar Sandstone via a subsea manifold and pipeline to Forties Field since April 2012. In 2018 the B2 well was the subject of a successful workover which increased production rates significantly. An infill well Bacchus South spudded on 28/12/2020.