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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/07062019207
Identification of
magnetic
enhancement at hydrocarbon-fluid contacts
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Sijibomioluwa A. Badejo,1 Adrian R. Muxworthy,2 Alastair Fraser,3 Graham R. Stevenson,4 Xiang Zhao,5 and Michael Jackson6
1Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; present address: CGG, Tyn Y Coed, Llanrhos, Llandudno, United Kingdom; [email protected]
2Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; [email protected]
3Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; [email protected]
4Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; [email protected]
5Research School of Earth Sciences, Australian National University, Canberra, Australia; xiang.zhao@anu. edu.au
6Institute for Rock Magnetism (IRM), University of Minnesota, Minneapolis, Minnesota; [email protected]
ABSTRACT
Identifying the depths of the hydrocarbon-fluid contacts in a reservoir is important for determining hydrocarbon reserves and production planning. Using core samples from the Tay Sandstone reservoir in the central North Sea, we show that there is a magnetic
enhancement at the hydrocarbon-fluid contacts that is detectable through both
magnetic
susceptibility measurements and
magnetic
hysteresis measurements. We observed this
magnetic
enhancement at both gas-oil and oil-water contacts, which have been independently identified using nonmagnetic methods; we did not consider gas-water contacts in this study. We demonstrate that this
magnetic
enhancement is caused by the precipitation of new nanometric iron oxide (magnetite) and iron sulfide (greigite) phases. The
magnetic
enhancement may be caused by diagenetic changes or preferential biodegradation at the top of the oil column during early filling and at the oil-water contact. Our findings have the potential to be used to identify paleo-hydrocarbon-fluid contact in both structurally modified fields and failed wells. The technique can also be used to infer the fill history of a basin and calibrate petroleum systems models.
Magnetic
susceptibility measurements have the advantage that they can easily and quickly be measured in the field on whole core material.
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