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Using magnetic techniques to calibrate hydrocarbon migration in petroleum systems modelling: A Case Study from the Lower Tertiary, UK Central North Sea

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Title: Using magnetic techniques to calibrate hydrocarbon migration in petroleum systems modelling: A Case Study from the Lower Tertiary, UK Central North Sea
Authors: Badejo, SA
Muxworthy, AR
Fraser, A
Neumaier, M
Perkins, JR
Stevenson, GR
Davey, R
Item Type: Journal Article
Abstract: Magnetic minerals form or alter in the presence of hydrocarbons, making them a potential magnetic proxy for identifying hydrocarbon migration pathways. In this paper, we test this idea by magnetically measuring core samples from the Tay Fan in the Western Central Graben in the Central North Sea. In a companion paper, 3-D petroleum systems modelling has been carried out to forward model migration pathways within the Tay Fan. Rock magnetic experiments identified a range of magnetite, maghemite, iron sulphides, siderite, goethite and titanohematite, some of which are part of the background signal, and some due to the presence of hydrocarbons. Typical concentrations of the magnetic minerals were ∼10–200 ppm. Importantly, we have identified an increasing presence of authigenic iron sulphides (likely pyrite and greigite) along the identified lateral hydrocarbon migration pathway (east to west). This is likely caused by biodegradation resulting in the precipitation of iron sulphides, however, though less likely, it could alternatively be caused by mature oil generation, which subsequently travelled with the migrating oil to the traps in the west. These observations suggest mineral magnetic techniques could be a rapid alternative method for identifying the severity of biodegradation or oil maturity in core sample, which can then be used to calibrate petroleum systems models.
Issue Date: Oct-2021
Date of Acceptance: 16-Jun-2021
URI: http://hdl.handle.net/10044/1/90415
DOI: 10.1093/gji/ggab236
ISSN: 0956-540X
Publisher: Oxford University Press (OUP)
Start Page: 617
End Page: 631
Journal / Book Title: Geophysical Journal International
Volume: 227
Issue: 1
Copyright Statement: © The Author(s) 2021. Published by Oxford University Press on behalf of The Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model).
Keywords: 0403 Geology
0404 Geophysics
0909 Geomatic Engineering
Geochemistry & Geophysics
Publication Status: Published
Online Publication Date: 2021-06-21
Appears in Collections:Earth Science and Engineering