Overthickening of sedimentary sequences by igneous intrusions

Niall Mark* (Corresponding Author), Nick Schofield, David Gardiner, Liam Holt, Clayton Grove, Douglas Watson, Andy Alexander, Heather Poore

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)
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The identification of extensive intrusive igneous complexes both in subsurface data and in field studies has resulted in quantification of the volumes of igneous material. Despite this research there is still little connection established between the amount of igneous material intruded into a basin and its effect on subsequent basin evolution in terms of burial and loading. To understand how additional igneous material may influence basin evolution we investigate igneous intrusions from the Faroe-Shetland Basin (FSB) utilising subsurface data. This study highlights that the total estimated thickness of sediment during Cretaceous is likely an overestimate as the sedimentary fill consists of significant quantities of igneous material which was emplaced during the Paleocene (56 Ma).
Previously this additional igneous material has not been accounted for in estimates of sedimentation rates and the burial history of the FSB. Importantly petroleum system modelling to understand generation and expulsion of hydrocarbons benefits from correct estimates of basin fill. The overthickening of basins by igneous material will affect the timing of hydrocarbon generation and subsequently the proper evaluation of exploration targets. In order to fully understand basin evolution the volumes of igneous material and when this material was emplaced must be acknowledged and considered.
Original languageEnglish
Pages (from-to)46-60
Number of pages5
JournalJournal of the Geological Society
Issue number1
Early online date26 Oct 2018
Publication statusPublished - Jan 2019

Bibliographical note

This study was part of a collaboration between the University of Aberdeen, Siccar Point Energy Ltd and Integrated Geochemical Interpretation (IGI). Siccar Point Energy Ltd are thanked for giving the author permission to publish. Karolina Harvie and Kevin Ward from Petrosys are thanks for their support during the mapping process of the project. The lead author’s PhD is funded by JX Nippon Exploration and Production (U.K.) Limited as part of the Volcanic Margin Research Consortium Phase 2. PGS are thanked for allowing the author access to the MegaSurveyPlus and PGS/TGS FSB 2011-12 MultiClient GeoStreamer data and for granting permission to publish this work. Seismic interpretation was carried out using Schlumberger Petrel software. Well log analysis was carried out using Schlumberger Techlog software. Dave Ellis and Victoria Pease are thanked for the comments which greatly improved the revisions of this paper. Well data was obtained from the UK Oil and Gas Authority (OGA) Common Data Access (CDA).


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