Igneous activity in the East Rockall trough: Nature, origin, and impact on the petroleum system

J. G. Clark, M. Huuse

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

During the early Cenozoic, igneous activity of varying intensity was widespread along the NE Atlantic margin. Igneous features are well imaged on 3D seismic data on the eastern margin of the Rockall Trough. Magmatism was both extrusive and intrusive with associated intrusion-related vent structures, which may have significant implications for the petroleum system of this frontier province. The extrusions occurred during the Late Paleocene and Early Eocene from a Hebridean Platform source, characterised by NE-SW trending flows with flow lengths of up to 18 km. The most prominent intrusions are Early Paleocene in age and were sourced from the Hebridean Seamount with aerial extents of up to 22 km2. Intrusion-related vent structures are dome shaped features typically overlying the edges of saucer-shaped intrusions. Their formation is related to fluid expulsion up to the contemporaneous seabed from the intrusion tips as it cools. As the vents occur on the seafloor, their presence can be used to date associated intrusions. We will demonstrate the igneous activity and how it can impact the petroleum system in both positive and negative ways including trap formation, top seal integrity and poor seismic imaging of pre Cenozic successions below the igneous features.

Original languageEnglish
Title of host publication71st European Association of Geoscientists and Engineers Conference and Exhibition 2009
Subtitle of host publicationBalancing Global Resources. Incorporating SPE EUROPEC 2009
PublisherSociety of Petroleum Engineers
Pages2832-2836
Number of pages5
Volume5
ISBN (Print)9781615672363
Publication statusPublished - Jun 2009
Event71st European Association of Geoscientists and Engineers Conference and Exhibition 2009 - Amsterdam, Netherlands
Duration: 8 Jun 200911 Jun 2009

Conference

Conference71st European Association of Geoscientists and Engineers Conference and Exhibition 2009
Country/TerritoryNetherlands
CityAmsterdam
Period8/06/0911/06/09

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