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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Mozambique (1)
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North Africa
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Libya (1)
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West Africa
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Atlantic Ocean Islands
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Moine thrust zone (4)
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Orkney Islands (6)
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Midland Valley (2)
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oxygen
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Invertebrata
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Protista
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Plantae
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Paleozoic
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Precambrian
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upper Precambrian
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sheet silicates
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sulfides
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Primary terms
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Africa
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North Africa
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West Africa
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Svalbard (3)
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Asia
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Saudi Arabia (1)
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Far East
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Philippine Islands (1)
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Middle East
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Cyprus (1)
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Atlantic Ocean
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North Atlantic
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Blake-Bahama Outer Ridge (1)
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Faeroe-Shetland Basin (22)
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Gulf of Mexico (2)
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North Sea
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Brent Field (1)
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East Shetland Basin (1)
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Oseberg Field (1)
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Northeast Atlantic (12)
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Atlantic Ocean Islands
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Faeroe Islands (15)
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Unst (12)
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Atlantic region (3)
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brines (1)
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Canada
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Eastern Canada
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Nunavut
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carbon
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C-13/C-12 (3)
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catalogs (1)
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Cenozoic
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Tertiary
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Neogene
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lower Eocene
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Ypresian (2)
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Oligocene (1)
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Paleocene
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lower Paleocene
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Danian (1)
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K-T boundary (1)
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upper Paleocene
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Thanetian (2)
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Zambales Ophiolite (1)
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Chordata
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Vertebrata
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Scotland
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Great Glen Fault (3)
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Hebrides
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Inner Hebrides
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Mull Island (1)
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Highland region Scotland
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Moine thrust zone (4)
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Orkney Islands (6)
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ultramafics
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peridotites
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harzburgite (1)
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lherzolite (1)
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-
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volcanic rocks
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andesites
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boninite (1)
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basalts
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alkali basalts
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alkali olivine basalt (1)
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flood basalts (1)
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komatiite (1)
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Invertebrata
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Protista
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Foraminifera (3)
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stable isotopes
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Upper Cretaceous
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Maestrichtian (1)
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Senonian (1)
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-
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Jurassic
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Middle Jurassic
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Bajocian
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Brent Group (3)
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Upper Jurassic
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Kimmeridge Clay (3)
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-
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Statfjord Formation (1)
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metal ores
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chromite ores (2)
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platinum ores (1)
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metals
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gold (2)
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platinum group
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palladium (1)
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platinum (2)
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platinum ores (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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-
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rhenium
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Re-187/Os-188 (1)
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metamorphic rocks
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cataclasites (1)
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gneisses
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granite gneiss (1)
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orthogneiss (1)
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marbles (1)
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metaigneous rocks
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metasedimentary rocks
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metapelite (1)
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metasomatic rocks
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serpentinite (2)
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mylonites
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schists
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metamorphism (11)
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Northern Hemisphere (1)
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paleomagnetism (1)
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Paleozoic
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Carboniferous
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Upper Carboniferous (1)
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Devonian
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Middle Devonian
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Givetian (1)
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Old Red Sandstone (1)
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lower Paleozoic (2)
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Ordovician
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Silurian (6)
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upper Paleozoic (1)
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palynomorphs
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Dinoflagellata (4)
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miospores
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pollen (3)
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paragenesis (1)
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petrology (7)
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placers (1)
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Plantae
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algae
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diatoms (1)
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plate tectonics (15)
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Precambrian
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Archean
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Neoarchean (2)
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Lewisian Complex (2)
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Stillwater Complex (1)
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upper Precambrian
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Proterozoic
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Lewisian (1)
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Mesoproterozoic (1)
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Neoproterozoic
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Ediacaran
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Wonoka Formation (1)
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Moinian (1)
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Sturtian (1)
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Tonian (1)
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Torridonian (1)
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Paleoproterozoic (1)
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Shetland Islands
A new stratigraphic framework for the early Neoproterozoic successions of Scotland
Interpreter's Corner: Practical application of global siliciclastic rock-property trends to AVA interpretation in frontier basins
Tectonic significance of a supra-ophiolitic sedimentary cover succession, Unst, Shetland, Scottish Caledonides: insights from the U–Pb–Hf detrital zircon record
The Clair Field, Blocks 206/7a, 206/8, 206/9a, 206/12a and 206/13a, UK Atlantic Margin
Abstract The Clair Field is a giant oilfield containing in the region of 6–7 Bbbl of stock tank oil initially in place, located approximately 75 km west of the Shetland Islands. As such, it represents the single biggest hydrocarbon accumulation on the UK Continental Shelf. Clair was discovered in 1977, but first production did not occur from Phase 1 until 2005, after a lengthy appraisal period. The major appraisal milestone occurred in 1991 after well 206/8-8 proved up fractured clastic red beds of the Devonian Lower Clair Group. This was followed up with an extended well test on 206/8-10Z, which demonstrated the longer-term performance of the reservoir. Further appraisal on Clair Ridge led to the sanction of the Clair Ridge, which came on stream in November 2018. Following the Greater Clair appraisal programme in 2013–15, development options are currently being worked for Clair South, which will develop the Lower Clair Group reservoirs together with overlying shallow-marine reservoirs of the Cretaceous and Jurassic.
The Edradour Field, Block 206/4a, UK Atlantic Margin
Abstract The Edradour Field, located in Licence P1453 on Block 206/4a of the Faroe–Shetland Basin, was put on production in August 2017. It lies c. 50 km NW of the Shetland Islands in a water depth of c. 300 m, and consists of one subsea well that produces gas condensate from the Albian Black Sail Member of the Commodore Formation. It is part of a joint development scheme along with the Glenlivet Field that sees the commingled multiphase production transported to the Shetland Gas Plant via tieback to the pre-existing Laggan–Tormore flowlines. The Edradour single well development has reserves of 21 MMboe from a gas initially-in-place of 142 bcf. It is operated by Total E&P UK Ltd under the P1453 licence with Ineos E&P (UK) Ltd and SSE E&P UK Ltd as partners.
Abstract The Glenlivet Field, located in Block 214/30a within the Faroe–Shetland Basin, was put on production in August 2017. It lies approximately 70 km NW of the Shetland Islands, in a water depth of c. 440 m. The development consists of two subsea wells that produce gas condensate from the Paleocene Vaila Formation, which comprises deep-water turbidite deposits with excellent petrophysical properties. It is part of a joint development scheme along with the Edradour Field that sees the commingled multiphase production transported to the Shetland Gas Plant via tie-back to the pre-existing Laggan–Tormore flowlines. Glenlivet is operated by Total E&P UK Ltd under the P1195 licence since September 2014 with Ineos E&P (UK) Ltd and SSE E&P UK Ltd as partners.
Abstract The Laggan and Tormore fields are found within the Flett sub-basin of the Faroe–Shetland Basin. Situated 120 km west of the Shetland Islands in 600 m water depth, they are part of the deepest subsea development in the UK to date with a 143 km subsea tie-back to onshore facilities. The reservoirs are found within the T35 biostratigraphic sequence of the Paleocene Vaila Formation and comprise sand-rich turbiditic channelized lobes with good reservoir properties, separated by metric to decimetric shale packages. Laggan is a gas-condensate field, whereas Tormore fluid is a richer gas with a saturated oil rim. Seismic reservoir characterization is a key to the field development where differentiation of fluid type proved challenging. Both fields came on stream in 2016 as part of the Greater Laggan area development scheme.
Abstract The Rosebank Field is located primarily in Block 213/27a in the Faroe–Shetland Basin, c. 130 km west of the Shetland Islands in water depths of c. 1100 m (3600 ft). Hydrocarbons are trapped within an elongate, SW–NE-trending four-way anticlinal structure. The principal Colsay Sandstone Member reservoir consists of several vertically stacked, Late Paleocene to Early Eocene fluvial and deltaic reservoirs separated by volcanic sequences. Well log and core data indicate that reservoir quality is high, with porosities in the range of 19–23% and average permeability of c. 3 D. Oil quality is also high, with average oil gravity of 37°API and in-situ viscosity of c. 1 cP at a mean reservoir temperature of 175°F. The field holds a substantial resource and is currently under evaluation for development.
The Schiehallion and Loyal fields, Blocks 204/20, 204/25a, 204/25b, 205/16 and 205/21b, UK Atlantic Margin
Abstract The Schiehallion subsea development comprises two fields, Schiehallion and Loyal, which are located approximately 200 km to the west of the Shetland Islands in the UK Continental Shelf. The Schiehallion and Loyal fields were discovered in late 1993 and 1994, respectively, with a combined oil-in-place of more than 2.3 Bbbl. The fields are developed under waterflood and were on production from 1998 to 2013. After an extended shut-in, the fields were brought back on line in 2017, through new floating production facilities. Most of the production to date has been from the Paleocene Vaila Formation deep-water turbidite, in the T31 and T34 reservoir intervals. The ongoing Quad 204 redevelopment drilling programme commenced in April 2015, has drilled and completed 21 wells to date, and is expected to continue for several more years. The campaign includes new producer–injector pairs and stand-alone wells to support existing well stock, targeting stacked turbidite reservoir intervals, including the youngest T35–T34 interval, the main T31 interval and the previously under-developed T28–T25 fairway. In addition to an active drilling programme, a 4D seismic survey was acquired and processed in 2018, and its interpretation is key to unlocking further potential sources of value in this mature field.
Late Carboniferous dextral transpressional reactivation of the crustal-scale Walls Boundary Fault, Shetland: the role of pre-existing structures and lithological heterogeneities
The nature and age of basement host rocks and fissure fills in the Lancaster field fractured reservoir, West of Shetland
An integrated approach for fractured basement characterization: the Lancaster Field, a case study in the UK
The Neoarchean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate
A mechanism for chromite growth in ophiolite complexes: evidence from 3D high-resolution X-ray computed tomography images of chromite grains in Harold’s Grave chromitite in the Shetland ophiolite
Platinum-group element remobilization and concentration in the Cliff chromitites of the Shetland Ophiolite Complex, Scotland
Placer platinum-group minerals in the Shetland ophiolite complex derived from anomalously enriched podiform chromitites
A redescription of the endemic antiarch placoderm Asterolepis thule from the Middle Devonian (Givetian) of Shetland and its biostratigraphical horizon
Abstract Tsunami catalogues provide important datasets in assessing the risk from infrequent but potentially high-impact events. Although the UK is located away from subduction zones (the most common origin of tsunamis), tsunamis have struck its shores, most notably those triggered by the prehistoric Storegga submarine landslide and the 1755 Lisbon earthquake. Since the major events of 2004 (Indian Ocean) and 2011 (Japan) tsunamis are in the public psyche, even if the risks to UK coasts are not. Due to this heightened awareness, many reported events are claimed to be tsunamis and the potential for tsunamis is increasingly included in risk planning; understanding the true frequency of tsunamis is therefore important. Within the UK, the evidence for tsunamis includes tide gauge readings, reported visual observations and interpretation of sedimentological features. Catalogues need to consider whether the event is a true tsunami in order to avoid a plethora of claims that confound risk assessments; for example, recent well-documented events generated by weather systems (meteotsunamis) provide a possible explanation for some historical events. A detailed examination of the impact of tsunamis upon the UK coast is provided, including examples of events triggered by the three primary causes of tsunamis: seismicity, submarine landslides and coastal landslides.
Abstract During Late Paleocene–Early Eocene times, the modern Rosebank structure was located at the juxtaposition of the easterly advancing Flett volcanic system and the northerly prograding Flett delta. As a result, the Rosebank reservoir sandstones are interstratified with volcanic and volcaniclastic rocks, offering challenges for reservoir imaging, depth prediction and reservoir characterization. These challenges have driven the application of Ocean Bottom Node (OBN) seismic technology. OBN data have yielded improved velocity models for depth conversion, better reservoir definition and key insights to aid the modelling of sand distribution from seismic attributes. Spectral decomposition of the OBN seismic data has facilitated the extraction of distinct volcanic subunits, whilst spectral enhancement has enabled visualization of complex stacking patterns within individual igneous layers. To complement the seismic analysis, detailed geological analogue studies have been undertaken in volcanic provinces such as the Palaeogene volcanic district of SE Greenland and the Columbia River Flood Basalt Province, USA. No single outcrop provides a definitive analogy to Rosebank, but each offers insights that provide an important link to understanding and managing the main subsurface uncertainties associated with field development. Integration of these multiple workflows have improved the reservoir characterization and provided the foundation for the optimization of the field development plan.
Abstract To date, fractured crystalline basement reservoirs (basement) on the UK Continental Shelf (UKCS) have largely been underexplored, despite the fact that numerous indications of hydrocarbons have been reported from basement in wells dating back to the 1970s. As production from the UKCS continues to decline, and with the exploration potential of more traditional plays becoming increasingly mature, the potential of the overlooked and underrated basement play warrants further exploration. Over the last 10 years, Hurricane Energy (Hurricane) have deliberately set out to explore the potential of this untapped resource, focusing on the Rona Ridge trend, West of Shetland. The Lancaster Field has been penetrated by four wells and benefits from a full 3D seismic survey, and, as such, represents Hurricane's most de-risked basement asset. The level of understanding of the Lancaster reservoir is such that Hurricane is now working towards a phased field development. This paper provides a summary of the geology and reservoir characteristics of the Lancaster Discovery, and a description of the technical progress achieved, to date, in de-risking the Lancaster Field.