Lessons Learned from the Management of Basin Floor Submarine Fan Reservoirs in the UKCS

Leonard, Andy; Jolley, Liz; Carter, Andrew; Mills, Carol; Jones, Neville; Bowman, Mike

doi:10.5724/gcs.00.15.0478

Cited by 15 publications

(3 citation statements)

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“…Excellent seismically based examples have been documented from offshore Angola (Mayall and Stewart, 2000;Prather et al, 2000;Sikkema and Wojcik, 2000;Kolla et al, 2001;Mayall and O'Bryne, 2002;Navarre et al, 2002;Abreu et al, 2003;Prather 2003), offshore Nigeria (Armentrout et al, 1999;Pirmez et al, 2000;Chapin et al, 2002;Deptuck et al, 2003;Fonnessu, 2003;Prather, 2003), the west of Shetlands (Lamers and Carmichel, 1999;Leonard et al, 2000), the United Kingdom North Sea (Jeanette et al, 2000(Jeanette et al, , 2003aLeonard et al, 2000), Indonesia (Demyttenaere et al, 2000;Posamentier et al, 2000;Guritno et al, 2003;Saller et al, 2003;Saller et al, 2004;Mayall et al, 2006), the Gulf of Mexico (Prather et al, 1998;Varnai, 1998;Beaubouef et al, 1999;Friedmann and Beaubouef, 1999;O'Byrne et al, 1999;Beaubouef and Friedmann, 2000;Fugitt et al, 2000;Jeanette et al, 2003b;Posamentier and Kolla, 2003), offshore Trinidad (Brami et al, 2000), and the Brazilian Campos Basin (Bruhn, 1998(Bruhn, , 2001Ragagnin and Moraes, 2008).…”

Section: Introductionmentioning

confidence: 94%

Three-dimensional seismic geomorphology of a deep-water slope-channel system: The Sequoia field, offshore west Nile Delta, Egypt

Cross¹,

Cunningham²,

Cook³

et al. 2009

Bulletin

114

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A B S T R A C TWithin the Nile Delta gas province, reservoirs are dominated by Pliocene slope-channel systems, which are spectacularly imaged on high-quality three-dimensional seismic data. This article deals with the detailed seismic geomorphology of the Sequoia channel system, focusing on the geometry and distribution of its component sand bodies and the impact they have on reservoir heterogeneity. The Sequoia reservoir serves as a potential analog for similar but less well-imaged, deep-water slope systems.The reservoir consists of a succession of sandstones and mudstones organized into a composite upward-fining profile. Sand bodies include laterally amalgamated channels, sinuous channels, channels with frontal splays, and leveed channels and are interpreted to be the products of deep-water gravity-flow processes. Above a major basal incision surface, the reservoir is highly sand prone and made up of laterally amalgamated channels. The medial section of the reservoir is more aggradational and exhibits laterally isolated and sinuous channels. Within the upper part of the reservoir, channels are smaller, straighter, and built of individual channels with associated frontal splay elements and less common leveed channels. The main channel system is buried by a prograding slope succession that includes lobate sand-sheet elements. The stacking of facies within the Sequoia channel system implies a punctuated waning of sediment supply prior to eventual abandonment.

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Section: Introductionmentioning

confidence: 94%

Three-dimensional seismic geomorphology of a deep-water slope-channel system: The Sequoia field, offshore west Nile Delta, Egypt

Cross¹,

Cunningham²,

Cook³

et al. 2009

Bulletin

114

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“…Recoveries from this reservoir can be excellent. As an example, the first 16 wells on the Forties Field collectively produced 10 6 barrels of oil (Leonard et al 2000) and it is estimated the field may ultimately produce 70% of original oil in place (Hempton et al 2005).…”

Section: Technical Evaluationmentioning

confidence: 99%

The Huntington discoveries: efficient exploration in the UK Central North Sea

Hollywood¹,

Olson²

2010

PGC

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The Huntington discoveries are an unusual exploration success in that two oil accumulations were tested in separate syn-and post-rift reservoirs with a single well. The discoveries are located 205 km east of Aberdeen in the East Central Graben some 35 km east of Forties Field in 300 ft of water. The 22/14-5 discovery well, drilled in May 2007, encountered a 122 ft oil column in the Paleocene Forties Sandstone and also a 136 ft oil column in the Upper Jurassic Fulmar Sandstone. Both the Forties and the Fulmar contain high-quality oil, 41 and 398 api gravity, respectively. Aggregate flow rates from the two zones exceeded 11 000 boepd on test. Appraisal drilling of the Forties was completed in late 2007 with first oil targeted for 2011. The Fulmar appraisal programme is currently in progress. The Forties reservoir is a high net to gross sandstone containing stacked channel sequences deposited in a submarine fan system. The Fulmar reservoir also contains a thick sand package deposited in a shallow marine shelf setting. Pre-drill mapping based on reprocessed 3D seismic indicated a structural closure on both horizons at the location tested by the well. At both the Forties and Fulmar targets, however, the oil column height exceeded the pre-drill prognosis. This overview will focus on pre-drill perceptions of the prospect relative to actual drilling results.

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“…Leonard et al 2000). Advances in drilling technology, seismic imaging, well logging and the advent of 4D seismic data since the 1970s have allowed the large early fields to be developed to a potential unforeseen in the early stages of development, and for smaller, more complex reservoirs to be efficiently and economically developed.…”

Section: Jonesmentioning

confidence: 99%