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@article{Turney:2024:gji/ggae059,
author = {Turney, J and Muxworthy, AR and Sims, M and Weiss, D and Fraser, A},
doi = {gji/ggae059},
journal = {Geophysical Journal International},
pages = {570--587},
title = {Quantifying the characteristics of magnetic oil-water contacts in mature hydrocarbon reservoirs and their capacity for understanding hydrocarbon remigration},
url = {http://dx.doi.org/10.1093/gji/ggae059},
volume = {237},
year = {2024}
}
TY - JOUR
AB - Increasing magnetization within mature hydrocarbon reservoirs provides a new technique in identifying oil–water contacts (OWCs) in cored wells with the potential to assess yield thereby reducing the need for further exploration. Authigenic precipitation of magnetic minerals at OWCs may also help locate palaeocontacts (PCs), where structural changes to the petroleum system have caused hydrocarbon remigration. This study determines the magnetic characteristics of magnetic enhancements at OWCs and possibly PCs in silliclastic and carbonate reservoirs at the Wytch Farm oil field, Wessex Basin, UK. Increases in saturation magnetization and susceptibility are observed at the OWC in 11 of the 12 analysed cored reservoirs owing to the increased presence of magnetite and vivianite. Geochemical analysis and shallow reservoirs suggest biogenic and inorganic mineral precipitation is extensive at the OWC depending on iron, sulphur and phosphorus availability. Similar magnetic characteristics have been observed in magnetic enhancements above the OWC in numerous wells which may represent OWCs before a basin-wide easterly tilt caused hydrocarbon remigration in the Cenozoic. Multiple magnetic enhancements above the OWC in westerly onshore wells, suggest this remigration may have occurred as numerous phases.
AU - Turney,J
AU - Muxworthy,AR
AU - Sims,M
AU - Weiss,D
AU - Fraser,A
DO - gji/ggae059
EP - 587
PY - 2024///
SN - 0956-540X
SP - 570
TI - Quantifying the characteristics of magnetic oil-water contacts in mature hydrocarbon reservoirs and their capacity for understanding hydrocarbon remigration
T2 - Geophysical Journal International
UR - http://dx.doi.org/10.1093/gji/ggae059
UR - http://hdl.handle.net/10044/1/110032
VL - 237
ER -