Appendix: A list of common abbreviations AAI Absolute acoustic impedance LPG AI Acoustic impedance LST °API Oil gravity, American Petroleum Institute LWD degrees LSW AFTA Apatite fission track analysis Ma AST Aggradational system tract mBRT AVO Amplitude versus offset (amplitude variation mD with offset) mfs BBL Barrel MORB BCPD Barrels of condensate per day MRIL BGS British Geological Survey ms BHT Bottom hole temperature N: G (NG) BIRPS British Institutions Reflection Profiling NGL Syndicate NMO BKB Below Kelly bushing NMR BMSL Below mean sea-level NOCS BOPD Barrels of oil per day NPD BOE Barrels of oil equivalent NNS BRT Below rotary table OBC BWPD Barrels of water per day OBS CDR Common depth ratio ODP CMP Common mid point ODT CNS Central North Sea OMF COG Common offset gather owe CRG Common receiver gather PCA CSG Common slowness gather PBU CSIA Compound specific isotope analysis PSDM ,5 ,3 C Ratio of carbon-13 isotope to carbon-12 isotope psi measured in a sample relative to a standard PVT <5 15 N Ratio of nitrogen-15 isotope to nitrogen-14 RFT isotope measured in a sample relative to a standard Ro <5 ,8 0 Ratio of oxygen-18 isotope to oxyge-16 isotope r a measured in a sample relative to a standard RSA DHI Direct hydrocarbon indicator R w DMO Dip move out s, DSDP Deep Sea Drilling Project DST Drill stem test s 2 DTI UK Department of Trade and industry ERD Extended reach drilling EWT Extended well test SB FIT Formation interval test SCF FSB Faeroe-Shetland Basin SEM FTSS Feet, subsea Sm 3 GC Gas chromatography SNS GC-MS Gas chromatography mass spectrometry SrRSA GEUS Geological Survey of Denmark and Greenland ss GIIP Gas initially in place STB GOC Gas-oil contact STOIIP GOR Gas-oil ratio o w GRV Gross rock volume ^wirr GWC Gas-water contact TD HDIL High definition induction log TDS HI Hydrogen index TOC HP/HT High pressure/high temperature TSR HST Highstand system tract TST HWC Hydrocarbon-water contact TVD IMF Inner Moray Firth TVDSS IOR Improved oil recovery TWT KCF Kimmeridge Clay Formation UKCS Kh Horizontal permeability VCS Kv Vertical permeability v v Liquified petroleum gas Lowstand system tract Logging while drilling Lowstand wedge million years Metres below rotary table millidarcies maximum flooding surface Mid-ocean ridge basalt Magnetic resonance imaging log milliseconds Net to gross Natural gas liquids Normal move out Nuclear magnetic resonance Norwegian Continental Shelf Norwegian Petroleum Directorate Northern North Sea Ocean bottom cable Ocean bottom seismograph Ocean Drilling Program Oil-down-to Outer Moray Firth Oil water contact Principal component analysis Pressure build-up Pre-stack depth migration Pounds per square inch Pressure, volume, temperature Repeat formation test Vitrinite reflectance measured using oil immersion objectives Resistivity (oil) Residual salt analysis Resistivity (water) Yield during (RockEval) pyrolysis of petroleum-like material contained in sample Maximum petroleum yield from kerogen of sample released during (RockEval) pyrolysis of petroleum Sequence boundary Standard cubic feet Scanning electron microscope Standard cubic metres Southern North Sea Strontium isotope residual salt analysis Subsea Stock tank barrel Oil initially in place Water saturation Irreducible water saturation Total depth Total dissolved solids Total organic carbon Thermal sulphate reduction Transgressive system tract True vertical depth True vertical depth, subsea two-way time United Kingdom Continental Shelf Vertical cable seismic P-(compressional) wave velocity
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Appendix: A list of common abbreviations · XVI APPENDIX: A LIST OF COMMON ABBREVIATIONS VR Vitrinite reflectance WAG Water-alternating-gas (oil recovery technique) Vs S-(shear) wave
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Appendix: A list of common abbreviations
AAI Absolute acoustic impedance LPG AI Acoustic impedance LST °API Oil gravity, American Petroleum Institute LWD
degrees LSW AFTA Apatite fission track analysis Ma AST Aggradational system tract mBRT AVO Amplitude versus offset (amplitude variation mD
with offset) mfs BBL Barrel MORB BCPD Barrels of condensate per day MRIL BGS British Geological Survey ms BHT Bottom hole temperature N : G (NG) BIRPS British Institutions Reflection Profiling NGL
Syndicate NMO BKB Below Kelly bushing NMR BMSL Below mean sea-level NOCS BOPD Barrels of oil per day NPD BOE Barrels of oil equivalent NNS BRT Below rotary table OBC BWPD Barrels of water per day OBS CDR Common depth ratio ODP CMP Common mid point ODT CNS Central North Sea OMF COG Common offset gather owe CRG Common receiver gather PCA CSG Common slowness gather PBU CSIA Compound specific isotope analysis PSDM ,5,3C Ratio of carbon-13 isotope to carbon-12 isotope psi
measured in a sample relative to a standard PVT <515N Ratio of nitrogen-15 isotope to nitrogen-14 RFT
isotope measured in a sample relative to a standard
Ro
<5, 80 Ratio of oxygen-18 isotope to oxyge-16 isotope ra
measured in a sample relative to a standard RSA DHI Direct hydrocarbon indicator Rw
DMO Dip move out s, DSDP Deep Sea Drilling Project DST Drill stem test s2 DTI UK Department of Trade and industry ERD Extended reach drilling EWT Extended well test SB FIT Formation interval test SCF FSB Faeroe-Shetland Basin SEM FTSS Feet, subsea Sm3
GC Gas chromatography SNS GC-MS Gas chromatography mass spectrometry SrRSA GEUS Geological Survey of Denmark and Greenland ss GIIP Gas initially in place STB GOC Gas-oil contact STOIIP GOR Gas-oil ratio o w
GRV Gross rock volume ^ w i r r
GWC Gas-water contact TD HDIL High definition induction log TDS HI Hydrogen index TOC HP/HT High pressure/high temperature TSR HST Highstand system tract TST HWC Hydrocarbon-water contact TVD IMF Inner Moray Firth TVDSS IOR Improved oil recovery TWT KCF Kimmeridge Clay Formation UKCS Kh Horizontal permeability VCS Kv Vertical permeability vv
Liquified petroleum gas Lowstand system tract Logging while drilling Lowstand wedge million years Metres below rotary table millidarcies maximum flooding surface Mid-ocean ridge basalt Magnetic resonance imaging log milliseconds Net to gross Natural gas liquids Normal move out Nuclear magnetic resonance Norwegian Continental Shelf Norwegian Petroleum Directorate Northern North Sea Ocean bottom cable Ocean bottom seismograph Ocean Drilling Program Oil-down-to Outer Moray Firth Oil water contact Principal component analysis Pressure build-up Pre-stack depth migration Pounds per square inch Pressure, volume, temperature Repeat formation test Vitrinite reflectance measured using oil immersion objectives Resistivity (oil) Residual salt analysis Resistivity (water) Yield during (RockEval) pyrolysis of petroleum-like material contained in sample Maximum petroleum yield from kerogen of sample released during (RockEval) pyrolysis of petroleum Sequence boundary Standard cubic feet Scanning electron microscope Standard cubic metres Southern North Sea Strontium isotope residual salt analysis Subsea Stock tank barrel Oil initially in place Water saturation Irreducible water saturation Total depth Total dissolved solids Total organic carbon Thermal sulphate reduction Transgressive system tract True vertical depth True vertical depth, subsea two-way time United Kingdom Continental Shelf Vertical cable seismic P-(compressional) wave velocity
Base Cretaceous Event (BCE) 829, 830, 831 Base Cretaceous unconformity (BCU)
1014 basement
gravity anomaly 602 highs and heat flow 1316
basin modelling charge model 1323-1324 history of 1314-1315 pressure model 1320-1323 Rockall Trough 428-430 thermal model 1317-1318
basinal facies, NE Greenland 331, 333 Bean Basin 410-411 Beatrice Field 474 Ben Nevis Formation 504, 506, 518 Beothuk Field 474, 475 Bernard parameter 802 Beryl Embayment 127
reservoir properties, Banff Field 980-987 seal properties 1093 sedimentary properties 952 seismic inversion 1273 stratigraphic play concept 912, 915 Tor Formation study 945-947
Chalk Exploration project 911-912 Greater Ekofisk area
basin evolution 931-934 chalk stratigraphic plays 912, 975 exploration history 912 exploration model 934 palaeoenvironment analysis 917-921 reservoir evaluation 921-929 sedimentology 921 source rocks 931 stratigraphy 915-917 trap/seal evaluation 929-931
Chalk Group 814, 965, 969, 970, 1015, 1369 Fife Field 1138 hydrocarbon system 932-934 Mid North Sea High
erosion 175-177 seismic analysis 171-175
Slyne Trough 445 top chalk surface 776, 777
Chanter Field 854, 865 charge modelling 1323-1324 Charlie Gibbs Fracture Zone 392 Cheshire Basin 475 Chondrites 966, 968, 1142, 1191, 1213 chromatograms, Jurassic oils 651 chronostratigraphy v. lithostratigraphy
156-157 Cimmerian unconformity 136 Cimmerian uplift, East Irish Sea Basin
1387-1390 Clair Basin 602 Clair Field 645, 693, 722 Clair Group 661, 1369 Clair Ridge 602 Clare Basin 765, 778 Claymore Fan 852-853 Claymore Field 851 Clyde Sands 1094 Codroy Group 513 Coffee-Soil Fault 897 coherency
case studies Arkwright Field 1302-1304 Jaeren High 1304-1305 Leman Field 1299-1302
as a tool 1299 coiled tubing side tracking 1070 Commodore Formation 664, 671 concurrency 1070 Connemara Field 242, 474, 475 Conona Ridge 602 constant offset profiling 1245 Conybeare Group 577 Cook Formation 1177 Cormorant Group 1053, 1063, 1066 Corona Ridge 533, 543, 1377 Cow Head Formation 512 Cretaceous
Dalle Nacree Formation 474 Danish Central Graben 897, 898
see also Gertrud Graben Darwin Complex 580-581, 586 Darwin Igneous Centre 392, 396, 401 Dauntless Field 883, 884-886 debris flow 984 deconvolution processing 1259-1260 Deer Lake Group 513 deltaic fades 1190-1191 deltaic sandstone 343-344 density calculations 602, 603, 604 Devonian
drilling technology, Tern Field 1069-1074 Dun Caan Shale 475 Dunlin Group 93, 103, 1039, 1040, 1235 Durward Field 883, 884-886 Dyroey Formation 474
Eakring Field 474 East Central Graben, salt tectonics 185 East Faeroes High 42, 602 East Greenland Rift 42 East Hatton-Rockall Basin Centre 579 East Irish Sea Basin
burial history 1387-1390 hydrocarbon migration model
East Jan Mayen Fracture Zone 42 East Midlands oilField 748-754 East Midlands Shelf 774 East Piper High 856 East Shetland Basin see Brent Field; Strathspey
Field East Shetland Platform 232 East Solan Basin 694, 701 Eastern Graben 1030 Eastern Interior Basin 764 Eastern Shoals Formation 518 Eastern Trough Area Project (ETAP)
development 993-994, 1004-1005 reservoir behaviour 994-1004
Edale Gulf 778, 781 Edda Field 912, 913, 940-941 Edgeoya Platform 248 Egmanton Field 474 Egret Field
development 993-994 reservoir 994, 1002
Egret Formation 475 Eider Field 1066-1067 Eiriksson Formation 1053 Ekofisk Field 474, 912, 913, 915, 941, 945,
Gainsborough Field 474 Galicia Bank Basin 42 Galley Central High 846 Galley Fan 854 Galley Field 874 Galway Graben 410-411 Gamma Field 912, 913 gamma ray logs, Brent Field 97, 98 Gamma structure 863 Gardarbanken High 249 Garn Formation 265 gas chromatography, West Greenland seepages
308, 309, 310, 311, 312 gas composition, Southern Permian Basin
800-803 gas generation modelling 1330 Geike Centre 579 Geike margin 42 genetic stratigraphy 154 geochemistry applied to source rocks
methods 476-477 results 477-484 result discussed 484-485
see also Nevis Field Hornsund Fault Zone 42 Horseshoe Basin 501 Hospital Ground Formation 800 Hot Lens 867 Hot Sand 867 Howley Formation 513 Humber Group 93, 102, 157, 174, 1014, 1054,
Fife Field 1138 seismic inversion 1273, 1279 vitrinite reflectance data 1375 West Shetland 1377, 1380
Kinderscout Grit 778, 781 Kingfisher Field 1200 Kittiwake Field 879, 880-881
sequence stratigraphy 881, 882-883, 886 Knipovitch Ridge 42, 254 Kolbeinsey Ridge 42 Kong Karls Land Platform 248 Kraka Field 912 Kuugannguaq type oil 310
Labrador Sea 8 Labrador Shelf 505, 509-511 lacustrine facies 749 Lamba Formation 1369, 1370 Lange Formation 268, 282 Laramide events 177 large aperture recording 1245 Lealt Formation 484 Leman Field 1299-1302 Lennox Field 1383, 1384 Leyland Formation 1387 Lindesnes Ridge 913, 941 Lista Formation 177 lithofacies analysis 984 lithostratigraphy v. chronostratigraphy
Machar Field development 993-994 reservoir 994, 999-1001
Madgard Field 474 magmatism
Norwegian Sea 272 Palaeogene, Faeroe-Shetland Basin 546-553 West of Shetland 650 see also Atlantic margin large igneous
province (LIP) magnetic data, NE Rockall Basin 382 magnetic resonance imaging log (MRIL) 632 Magnus Field 474 Mammal Centre 579 Mandal Formation 931, 1225, 1325, 1333 Mandal High 897 marine shelf facies, NE Greenland 330-331 Maritimes Basin 513-514, 765-766 Markland Formation 510, 511 Marnock Field
1065-1066, 1070, 1177 Ness Lineament 392 net:gross ratio 1130 Netherlands
pop-up structure 222-223 pull-apart basin 221-222
Nevis Field 1051 horizontal well project
application of VSP 1055 evaluation 1060 perforating 1059-1060 pilot result 1055-1057 reservoir simulation 1054 well planning
method 1054-1055 results 1058-1059
stratigraphy 1053-1054 structure 1051-1052
Newfoundland Grand Banks 501 basin structure and potential 501-509 Jurassic palaeogeography 490 see also Hibernia Field
Newfoundland 511-514 see also Labrador Shelf
Niaqornaariuk type oil 312-313 Nise Formation 278, 282 nitrogen in gas 800, 804-805 Nokken prospect 1221 Nordfjord-Sogn Detachment 42 Nordkapp Basin 42 Nordland Ridge 42, 83-86, 671
salt tectonic effects 86-89 North Anatolian Fault 147 North Brook Formation 513 North Buchan Graben 856 North Claymore Field 873 North Halibut Basin 862, 863-865 North Halibut Graben 853, 856 North Mayo Basin 409 North Minch Basin 404 North Morecambe Field 1383 North Permian Basin see North Sea (Central) North Porcupine Basin 404 North Rona Basin 602 North Sea 293
charge models 1323-1324 pressure models 1320-1323 Tertiary sequence well ties 1268-1270 thermal models 1317-1318 triple junction area
thermal doming 117-118 unconformities 117-118
North Sea (Central) major graben 1030 salt tectonic control on inversion 191-195 salt tectonic control on sedimentation
Palaeophycus 1191, 1213 palaeotemperature analysis 619 palaeovalley systems see incised valley fill Paleocene
compression, Faeroe-Shetland Basin 541-542
facies analysis, Kangerlussuaq Basin 339, 342-344
igneous activity, West of Shetland 650 inversion tectonics 175 magmatism, North Atlantic margin 51-52 migration, Norwegian Central Graben
1336-1338 palaeogeography, Irish Rockall Trough
436 reservoir rocks 693, 993, 996, 999
Arkwright Field 1125, 1302 Faeroe-Shetland Basin 237, 556, 628 Greenland (West) 321-323 Labrador Shelf 511 Schiehallion Field 683 West of Shetland 653-656
rifting, Faeroe-Shetland Basin 538-541 seal rocks, West of Shetland 656 sediments
Faeroe Shetland White Zone 603-604 Irish Rockall Trough 437 North Sea (Central) 1348 Northeast Rockall Basin 400 Norwegian Sea 295, 298 Rockall Trough 415-417
sequence stratigraphy, West Shetland 1368-1371
source rocks, Voring Basin 236
XXIV INDEX
Paleocene (continued) stratigraphy
Atlantic margin (North) 231 Banff Field 982 Faeroe Basin 627-628 Foula Sub-basin 664-665 West of Shetland 649
tectonics Banff Field 977-978 North Atlantic 25, 32 West of Shetland 650
palynology, role in correlation 155 Papa Basin 602, 647, 694, 701 Papa Group 1369 Papa High 602 Paris Basin 474 Pennine Basin 764-765, 778, 817 Pennine coalfield 748-754 Pentland Formation 119, 1.21, 126, 153, 156,
methodology 614-616 results 616-623 use in migration studies 623-624
Rona Sandstone Formation 535, 661 thermal history reconstruction
methodology 614-616 results 616-623 use in migration studies 623-624
Ror Formation 1210 Rosemary Bank 42, 392, 401 Rosemary Bank seamount 579, 586 Rossan Basin and Ridge 411 Rosselia 1191 Rost Basin 42 Rotliegendes Group 812, 1008, 1031, 1138,
1299, 1384 Rough Rock Group 765, 766, 774 Ruhr District 773, 779, 780
S waves see seismic waves Sabden shale 1384 Saglek Basin 509 Saglek Formation 510 St George Group 513 St Kilda Centre 580 salt, role in rift-raft tectonics 201, 205 salt chimneys 886 salt domes, effect on heat flow 1316 salt minibasins 886-887 salt tectonics
Banff Field 977 Central North Sea 63-64, 66-68, 79,
182-191, 1033 Nordland Ridge 86-89 North Sea Rift 63-64
Saltire Field 854, 865 sandbox modelling 1033 Scalpa Sandstone Formation 446 Scandian trend 135 Scapa Field 873 Schaubcylindrkhnus 1189 Schiehal'lion Field 645, 683-684, 693
development 691 gas management 691-692 history 684 reservoir properties 686-691 reservoirs 657 seal rocks 686 seismic data 684-685 structure 685-686 trap type 686
Scott Field 870, 873, 874 Scremerston Coal Formation 475, 736-740 Sea of the Hebrides Basin 42, 353 sea-level change
Carboniferous 752, 757, 766 Cretaceous 334-335
seal rocks 148, 863, 1129, 1331, 1332 Cretaceous 929, 931
Fife Field 1138 Fulmar Field 1093
Jurassic Brent Field 93 Fife Field 1138 Fulmar Formation 1089, 1090
Labrador Shelf 511 Nevis Field 1054 Paleocene
Arkwright Field 1302 West of Shetland 656
Permian, Leman Field 1299 Schiehallion Field 686 Triassic
East Irish Sea Basin 1384, 1386-1387 Wytch Farm Field 1157
seismic inversion 928-929, 1271-1280 Beryl Embayment 1282-1287 Brent Field 1047-1048 Tern Field 1067-1068
seismic properties of chalk 940-943 effect of fluid 944-945 Tor Formation study 945-947
seismic sections Arkwright Field 1128, 1302 Brent Field 95, 1239 Central North Sea 1031 East Midlands oilField 753 Elgin Field 1010 Erris Trough 459 Faeroe-Shetland Basin 550, 551 Fladen Ground Spur 139, 146 Franklin Field 1011 Fulmar Field 1093 Gertrud Graben 899 Greater Shearwater 161 Helland Hansen licence 287 Jaeren High 1304 Leman Field 1300 Murdoch Field 793 Nevis Field 1053 Northeast Rockall Basin 395 Revfallet fault 88 Rockall Trough 425, 426, 427 Shetland-Faeroes Basin 1253 Slyne Trough 449, 450 Snorre-H Basin 833, 834, 835 Solan Field 699 South Arne Field 969, 972 Southern North Sea 180 Strathmore Field 697 Strathspey Field 1238, 1239 Telford Field 7077 Trent gasfield 575 Victory Field 716 West Central Shelf 180 Witch Ground Graben 139, 143, 147
seismic sections Keys Fault 208 Central Graben 272 Fisher Bank Basin 272
South Arne Field appraisal 961-964 exploration 959-961 reservoir character 965-968 reservoir fracturing 968-969 reservoir prediction 969-974 seismic section 969 structural setting 964-965 trap mechanism 974-975
South Brae Field 1200 South Halibut Trough 123, 125 South Morecambe Field 1383, 1387 South Scott Field 149 South Solan Basin 694 South Viking Graben 119-120, 122 South Wales Basin lithostratigraphy 778 South Whale Sub-basin 501-504, 505 Southern Permian Basin
Carboniferous rocks 798-800 gases 800-805
Spekk Formation 267 Staffin Bay Formation 475 Stappen High 249 Statfjord East see Tampen Spur Statfjord East Fault 837 Statfjord Formation 1039, 1040, 1177, 1235
reservoir model 1043 Steensby Bjerg Formation 325 steranes 308 Storegga Slide 237 Strathmore Field
appraisal 696 depositional environment 701 discovery 695-696 maturation history 711
Tomma Formation 474 Tommeliten Field 912, 913 Tor Field 912, 913 Tor Formation 474, 915, 917, 920, 923, 928,
929, 941, 975, 980 depositional model 952 fault controls on 952-953 porosity 1000 porosity depth cube 956 seismic response 945-947 South Arne Field 966-967, 969-970, 972,
973 thickness 949, 950, 952
Tornquist Line 10, 135 trace fossils
Beryl Formation 1189-1268 SouthArne Field 966, 968 Tilje/Are formations 1213 West Central Shelf 880
Trans-European Fault Zone 135 transformation ratio 1327-1330 transgressive systems tract (TST) 1210 trap structures 148, 875-877, 929-931
Barents Sea 252-254, 257 Elgin Field 1015 Faeroe-Shetland Basin 556-557 Franklin Field 1015-1018 Greenland (West) 323 Lowlander area 868, 872 Machar Field 999 Marnock Field 994 Monan Field 999 Mungo Field 996 Newfoundland Grand Banks 507 North Halibut Basin 863-865 Scott area 870, 873, 874 Solan Field 696 699 South Arne Field 974-975 South Piper area 865 Tartan area 865-868, 869, 870 Trent Field 814-816 Victory Field 715 Voring Basin 323 West of Shetland 656
Trent gasfield 800, 809, 810 depositional model 816-820 development drilling 809, 811 exploration history 809 geophysical data 814 reservoir rocks 816 seismic section 815 source rocks 814 stratigraphy 811-814 trap structure 814
INDEX XXV11
Triassic lithostratigraphy
Irish Sea 206 North Sea 206
minibasins, West Central Shelf 886-887 reservoir rocks 993, 994
Banks Group 1235 Barents Sea 254, 256 East Irish Sea Basin 1384, 1386, 1387 Faeroe-Shetland Basin 661 Statfjord Formation 1039 Strathmore Field 700-704 Tern Field 1066 Wytch Farm Field 1157
seal rocks, Wytch Farm Field 1157 sediments
North Sea 202-204 Slyne Trough 446-447
source rocks, Barents Sea 250 stratigraphy-
Atlantic margin (North) 231 Central North Sea 181 Elgin/Franklin Fields 1008 Trent Field 814
tectonics and palaeogeography 212-213 Banff Field 977 North Atlantic 75, 16, 19-20 West of Shetland 647
Trichichnus 1141 tritium tracers 1166-1167 Troena Basin 263, 264 Tromso Basin 42 Trondelag Platform 83, 261, 263 tuffs of West of Shetland 650-651 turbidites 902-903, 1093, 1116
unconformities Base Cretaceous 1014 Cimmerian 117, 136 Hardegsen 203, 213 Hercynian 447 North Sea Jurassic 117-118
prospectivity 227 reservoir rocks 323 stratigraphy 262-263 structural evolution 56, 233-236, 263-265 tectonic setting 261-262 thermal history 270-271 trap types 323 see also Helland Hansen licence; Nyk High
Voring Marginal High 42 Voring Plateau 8 Voyager Formation 475
Walls Boundary Fault 602 Watts Bight Formation 513 Weald inversion 176 well technology development 1069-1074
methodology 1265 results 1268-1270
Wessex Basin 176 West Central Graben 123, 125
salt tectonics 185 West Central Shelf 880
effects of salt 890-892 Jurassic provenance study 889-890 seismic analysis 886-889 sequence stratigraphy 881-886 stratigraphy 880-881 Tertiary folding 892
West Ekofisk 912, 913 West Fladen Basin 847, 848, 849 West Flannan Basin 386 West Halibut Basin 1102 West Jan Mayen Fracture Zone 42 West Lewis Basin 384-385, 396, 399
West Lewis High 386 West Lewis Ridge 396, 397-398 West Orkney Basin 351-352 West of Shetland