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Abstract
Abstract The Porcupine Basin lies on the continental shelf to the west of Ireland. It contains up to 4 km of Cretaceous sediments. A tectono/sequence stratigraphic and seismic facies study has divided the Cretaceous succession into three workable, genetically related, chronostratigraphic sequences (PK1, PK2 and PK3) separated by basinwide sequence boundaries. The PK1 sequence, of Valanginian-Late Aptian age, is dominated by by low-energy, mudstone-prone, marine shelf and basinal facies (transgressive and highstand systems tracts). Higher energy, fault-bounded clastic fans, sandstone-prone deltaic packages and turbidite/mass flow deposits (lowstand systems tract) are also present. The PK2 sequence, of Late Aptian-Cenomanian age, is dominated by low energy, mudstone-prone shelf and basinal deposits (transgressive and highstand systems tracts). Erosional channels associated with the Late Aptian relative sea-level fall are also present, as are turbidite mounds and deltaic packages (lowstand systems tract). The PK3 sequence, of Cenomanian-Danian age, is predominantly a chalk facies and represents low energy deposition in a southward-deepening sea. Some higher energy calciturbidites/slump masses occur along the basin margins, and reefal build-ups are also present. The higher depositional energy deposits offer the best potential for hydrocarbon accumulations.
Published Version
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