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Effect of hydrocarbon presence and properties on the magnetic signature of the reservoir sediments of the Catcher Area Development (CAD) region, UK North Sea

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Title: Effect of hydrocarbon presence and properties on the magnetic signature of the reservoir sediments of the Catcher Area Development (CAD) region, UK North Sea
Authors: Abdulkarim, MA
Muxworthy, A
Fraser, A
Sims, M
Cowan, A
Item Type: Journal Article
Abstract: This paper presents a detailed study investigating the effect of hydrocarbon presence on magnetic mineral diagenesis in sediments from the Catcher Area Development (CAD) region, UK North Sea, between 1,000 and 1,500 m (True Vertical Depth Sub-Sea). Magnetic analysis of core samples from hydrocarbon fields of the region and nearby dry-well sandstones (background) was carried out to determine if their signatures can serve as a proxy for understanding petroleum reservoir systems. From the background samples, nanometric and micron-sized magnetite, hematite and titano-iron oxides, were identified. Hydrocarbon presence in the reservoir sediments was found to diminish the iron-oxide signature and favour the precipitation of hexagonal pyrrhotite, siderite and potentially vivianite, lepidocrocite, greigite and paramagnetic iron sulphides. Hexagonal pyrrhotite was found at the oil-water transition zones. This relationship is possibly related to biodegradation at this interface. Siderite was found in increased abundance at shallower depths within the reservoir, which we attribute to hydrocarbon vertical migration and biodegradation. The interbedded shales also experienced significant magnetic mineral diagenesis that depended on its proximity to the hydrocarbon plume. These findings suggest that mineral magnetism can be applied to the identification of oil-water transition zones, reserve estimation, production planning and the determination of hydrocarbon migration pathways. It also suggests that mineral magnetic methods can be used to estimate the timing of hydrocarbon migration.
Issue Date: 8-Apr-2022
Date of Acceptance: 10-Mar-2022
URI: http://hdl.handle.net/10044/1/96140
DOI: 10.3389/feart.2022.818624
ISSN: 2296-6463
Publisher: Frontiers Media
Start Page: 1
End Page: 20
Journal / Book Title: Frontiers in Earth Science
Volume: 10
Copyright Statement: © 2022 Abdulkarim, Muxworthy, Fraser, Sims and Cowan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Keywords: 0403 Geology
0404 Geophysics
0406 Physical Geography and Environmental Geoscience
Publication Status: Published
Article Number: 818624
Online Publication Date: 2022-04-08
Appears in Collections:Earth Science and Engineering
Faculty of Engineering



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