References to Figures and Tables Are Given in Italics a Sand Formation
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Index References to Figures and Tables are given in cap rocks italics Central Irish Sea Basin 68 Douglas Field 39 North Celtic Sea Basin 240 Porcupine Basin 368 A Sand Formation 227, 230, 23 I, 232, 233 Rockall region 448, 454 depositional environment 236-9, 253 carbonates in diagenesis see calcite also dolomite facies analysis 246, 248-51 Carboniferous geology 1 palaeogeography 253-6 Irish Sea Basin 45, 52, 63 petrology 234-6 Kish Bank Basin 52 regional correlation 250-3 SE Ireland 79 reservoir character 239-40 West Clare Namurian Basin 327-8, 330 Abbotsbury 324 Cardigan Bay Basin 60, 65, 83, 91,102, 194, acoustic logs 268 197, 298 acoustic turbidity 41, 43 Celtic Sea 3, 13 Alpine orogeny 403 see also North Celtic Sea also South Celtic Sea anhydrite 25-7, 28, 29, 30 cements 25-7, 29, 30, 157-60, 163 Annagh Gneiss Complex 433 Central Clare Group 328 Antrim Lava Group 18 Central Irish Sea Basin (CISB) 2, 14, 42, 59-61 apatite fission track analysis (AFTA) 303, burial history 75 307-8, 396, 405, 406 exploration history 61 API gravity 40, 213, 343 hydrocarbon prospectivity 65-9, 73 Armorican Massif 323 tectonostratigraphy 61-5 Asterosorna 177, 234, 248 Chalk Group 213 Austrian events 113, 470 Cretaceous chalk see North Celtic Sea Basin Channel Basin 60, 81,102 Charlie Gibbs Fracture Zone 436 Cheshire Basin 60, 81, 82, 86 Bala Fault 13 chlorite 235 Ballycotton gas field 1, 6, 193, 227, 247, 259-60, 298 Chondrites 234, 248 A Sand Formation 235, 237, 242 Cimmerian events 111,470 discovery 5, 261 Clare Basin seismic sections 231,243 borehole logs 328, 329 structure 240 Bouguer gravity 330-1 Base Cretaceous Unconformity 341,475 hydrocarbon maturity 328 basement magnetic survey 331-3 age analysis 433-4 relation to West Clare Namurian Basin 327-8 structural analysis 417-19, 425 reservoir rocks 330 basin maps 2, 10, 48, 60, 83, 102, 140, 194, 280, 298, seismic sections 333-7 346, 386, 436 source rocks 328 Bearreraig Sandstone Formation 388 Clare Shale 328 belemnites 248 clastic fan facies 350, 362-3 bioherms 363, 366 clay minerals 156 biomarkers 399, 407 see also illite also kaolinite biostratigraphy 301 Clonakilty Formation 145 biostromal mounding 79 Clyde Basin 17, 22 Bognor Regis 324 Clyde Belt 89 Bouguer gravity anomalies 11-15, 330-1 Cockburn Basin 2 Brighton 324 stratigraphy 279-86 Bristol Channel Basin 60, 102, 194 structure 286-92 Brittany Basin 323 Cockburn Fault 280, 289, 290-2 Broadford Beds Formation 388 Codling Fault 65 Budleigh Salterton 324 concretions 234 burial history Connemara Field 343 North Celtic Sea Basin 269, 270, 274 coquina layers 234 Rathlin Basin 31-3 Cornubian Massif 323 burrows see trace fossils Cretaceous geology 1 13C isotope analysis 222, 244, 396 Atlantic Margin Basins 341 Caernarvon Basin 60 Central Irish Sea Basin 65 calcite in diagenesis 25-7, 29, 30, 157-60, 163, 235 Cockburn Basin 284-6 Caledonian orogeny 11, 14, 102-5, 443 Helvick field 212-13 Cannel Coal 38 Jeanne d'Arc Basin 476-7 494 INDEX Cretaceous geology (continued) Galway Granite 11,331 North Celtic Sea Basin gamma ray logs biostratigraphy 301,307 Clare Basin 329 Chalk erosion data 304, 307, 308, 309, Fastnet Basin 145 310-16 Greensand Group 249, 252 source rocks 193 Helvick field 216, 217, 219 stratigraphy 301 North Celtic Sea Basin 115, 121, 122, 127, 129, 147, see also A Sand Formation 176, 178, 183, 230, 268, 301 also Greensand Group St Georges Channel Basin 176 tectonics 111-13, 174 Slyne Trough 388 Porcupine Basin Western Irish Sea 52 facies analysis 350-4, 358-63, 363-6 gas chimneys 45 sequence stratigraphy 346-50, 354-5, 363 gas chromatograms 397, 398 Rockall Trough 453 gas oil ratio 40 St Georges Channel Basin 174 gas fields 6 crust see basement see Ballycotton also Kinsale Head Culm Measures 82 Gault Claystone 240, 246 geochemistry of oils 220-3, 389-96 geochronology 443-4 D prospect 261,265, 266, 271, 272 glauconite in diagenesis 157 deltaic facies 350-4, 358-62 Goban Spur 2, 60, 346 Devonian geology 63, 79 Goban-Cockburn Fault 280, 294 diagenesis 21, 27-31, 157-65 gravity anomalies see Bouguer gravity anomalies Diplocraterion 248 Greensand dolomite cement 25-7, 29, 30, 164-5, 235 depositional model 253 Donegal Basin 2, 11, 13, 60 facies analysis 246-50 Douglas Field 39-40 Formation 149, 212 history of prospecting 261-2 hydrocarbon correlation 269-74 maturity modelling 274 East Irish Sea Basin 2, 21 palaeogeography 253-6 Permian geology 82 regional correlation 250-3 Triassic geology 63, 68, 69, 81, 83, 86 stratigraphy 230, 231-3, 246 Eastbourne 324 trap development 274 English Channel Basin 60, 81,102 see also A Sand Formation Erris Ridge 417 Grenville orogeny 443 Erris Trough 2, 13, 60, 386, 341,414, 429 Gull Island Formation 328 Eubonia Basin 42 gypsum cement 25-7, 28, 29, 30 eustasy and basin fill haematite 25-7, 29, 30 Cretaceous 133-4 Haig Fras Basin 194, 280 Jurassic 131-2 Haig Fras Granite Batholith 13, 323 exploration record 4-5 halite 25-7, 29, 30 Hastings 324 Hatton Bank 386 facies analysis Hatton Basin 2, 436-7 North Celtic Sea Basin 248-50 basin development 437-8 Porcupine Basin 350-4, 358-63, 363-6 basin modelling 442-6 Faeroe Basin 60 crustal structure 429-31 Faeroe-Shetland Basin 386 exploration problems 435-6 Fastnet Basin 2, 14, 60, 102, 194, 280, 139, 140 hydrocarbon prospectivity 448-54 diagenetic history 157-65 wide angle reflection survey 438-42 intra Cretaceous unconformity 323 Hatton Continental Margin 431,435, 436, 437, 439, petrography of sequences 151-3, 155, 155-7 448, 454 sedimentology of sequences 142-5, 149-51 Hatton-Rockall Basin 386 source rocks 193 heavy minerals 156 stratigraphy 83 Hebrides Minch Basin 386 Triassic geology 82 Helsby Sandstone Formation 39 fault studies Helvick oil accumulation 1, 193, 298 Porcupine Basin 374-81 development 209, 225 feldspar 25-7, 29, 30, 155, 162 hydrocarbon reserves 223-5 flexural isostasy 438-9 hydrocarbon sources 220-3 foraminifera 196, 236, 248 reservoir rocks 213-20 Fortune Bay Formation 478 stratigraphy 211-13 Foyle Fault 15, 22 structure 209-11 INDEX 495 Hibernia Greensand Formation 18, 478 Kimmeridge Clay Formation 474 Highland Border Ridge 22 Kinsale Head gas field 1, 6, 157, 193,227, 247, 259-60, Highland Boundary fault 11 298 Holywell Shale Formation 37-8 A Sand Formation 235, 237, 242 hydrogen index (HI) discovery 4, 261 North Celtic Sea Basin 199, 221,263, 264, 268, 269 seismic sections 231, 236 Slyne Trough 401,402, 404 structure 240 type log 230 Iapetus Suture 437 Kish Bank Basin 2, 14, 42, 60 Icebox Formation 177, 178, 179, 181 source rocks 1, 73 Iceland-Faeroe Ridge wide-angle reflection study stratigraphy 63, 52, 83 459-65 illite Labadie Bank 140, 194 authigenesis 162, 163-4, 235 Laramide orogeny 403 cement 21, 25, 26, 29, 30 Larne Basin 17 Inner Hebrides Basin 60 Leannan Fault 15 Irish Mainland Shelf 346 Leinster Granite 11 Irish Sea Basin 13, 60, 102 Lias Sandstone Formation 142 see also Central Irish Sea Basin licensing system 6 also East Irish Sea Basin Little Sole Basin 280, 285 Irish Sea (Western) 48, 51 Llanbedr borehole 197 shallow gas studies 41-5, 49, 50, 52-8 Lough Indaal Basin 22, 60 Isle of Wight 324 Lough Neagh-Larne Basin 22 isotope analysis 222, 244, 396 Macrihanish Coalfield 22 Jeanne d'Arc Basin Magee Basin 60 fault trends 471 Magilligan borehole 29 lithofacies associations 478-87 Magnesian Limestone 17, 18 lithostratigraphy 469 magnetic surveys 331-3 rifting events 470, 472 Malin Basin 22, 60, 386 sedimentation marine flooding surfaces 186 Cretaceous 476-7 mass flow facies 354, 358-62 Jurassic 472-5 maturity studies 389-96 Jeanne d'Arc Formation 478 maximum flooding surface 475 Jurassic geology 1,195, 196 Melville Sub-Basin 280 Cockburn Basin 283 Mercia Mudstone Group 83 Helvick Field 211-21 Douglas Field 39 Jeanne d'Arc Basin 472-5 Irish Sea Basin 65, 68, 69, 71 Moray Firth 472-5 North Channel 17, 18 North Celtic Sea Basin Rathlin Basin 21, 23 depositional environment 174-7 mineralogy 155-7 distribution 172-4 Mochras Farm borehole 197 megasequences 113-19 Moray Firth Basin 60,469, 470, 472-5 sequence stratigraphy 186-90 Morecambe Bay 81 source rocks 193 Mupe Bay 324 areal extent 202-3 muscovite 155 Mythop Halite Formation 39 depositional environment 194-6 hydrocarbon generation 204 Navan-Silvermines Fault Complex 11 hydrocarbon potential 198-202 net accommodation space micropalaeontology 196 Cretaceous 133-4 sedimentology 196-8 Jurassic 131-2 stratigraphy 264-9 neutron log 183 thickness 198 North Celtic Sea Basin 2, 14, 101-2, 139-42, 193,280, structures 108-11 297, 298 tectonic setting 174 A Sand Formation Porcupine Basin 368, 472-5 depositional environment 236-9, 253 Rockall Trough 453 facies analysis 246, 248-50 Slyne Trough 388 palaeogeography 253-6 petrography 234-6 kaolinite 25-7, 29, 30, 162-3, 235 regional correlation 250-3 kerogen types reservoir geology 239-40 North Celtic Sea Basin 199, 221,242 seal rock 240 Slyne Trough 391,392, 395 sources for hydrocarbons 240-4 496 INDEX North Celtic Sea Basin (continued) Pabba Shale Formation 388, 390, 398, 399, 401, 402, basin history 245-6 404, 407 Cretaceous studies 323 palaeogeography 39, 96-8 . Chalk 301, 304 Fastnet Basin 143, 146, 150 depositional environment analysis 132-4 North Celtic Sea Basin 126, 128,143, 146, 150, 253-6 sequence stratigraphy 119-29 Palaeophycus 246, 248 petrography and sedimentology 149-51, Pay de Bray 323 155 Peel Basin 14, 42, 60 source rock studies 263-4 Pembroke Ridge 140, 194, 298 diagenetic history 157-65 Penarth Group 18, 23 exploration history 227, 231,261-2 permeability studies 165-6 Greensand Group 246 Carboniferous 330 depositional