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@article{Abdulkarim:2022:10.3389/feart.2022.973385,
author = {Abdulkarim, M and Muxworthy, AR and Fraser, A},
doi = {10.3389/feart.2022.973385},
journal = {Frontiers in Earth Science},
title = {High temperature susceptibility measurements: A potential tool for the identification of oil water transition zone (OWTZ) in petroleum reservoirs},
url = {http://dx.doi.org/10.3389/feart.2022.973385},
volume = {10},
year = {2022}
}
TY - JOUR
AB - Determining the position and thickness of the oil water transition zone (OWTZ) in hydrocarbon reservoirs is important to reserveestimation and production planning. This paper describes a magnetic method of identifying this zone. High temperaturesusceptibility (HTχ) measurements on core samples from Paleogene reservoirs of the UK Central North Sea revealed distinctsignatures around the oil water interface. Rapid increases in susceptibilities at temperatures < 250 °C were observed forsamples around the oil water interface unlike the main oil leg where alteration involving increase in susceptibility occurred atsignificantly slower rates and higher temperatures. The HTχ data together with Mössbauer measurements revealed that thevariation in alteration characteristics is due to the increasing concentration of hexagonal pyrrhotite and/or lepidocrocite aroundthe oil water interface. Hexagonal pyrrhotite was identified in reservoirs existing at temperatures of < 80 °C, whilelepidocrocite dominated the signature around the contact of deeper reservoirs. These observations suggest that the precipitationof hexagonal pyrrhotite is related to OWTZ centred biogenic activities i.e., biodegradation. The dominance of lepidocrocite indeeper diagenetic settings has been related to hydrolysis of hydrocarbon at the oil water interface, together with cessation ofbiogenic activities.
AU - Abdulkarim,M
AU - Muxworthy,AR
AU - Fraser,A
DO - 10.3389/feart.2022.973385
PY - 2022///
SN - 2296-6463
TI - High temperature susceptibility measurements: A potential tool for the identification of oil water transition zone (OWTZ) in petroleum reservoirs
T2 - Frontiers in Earth Science
UR - http://dx.doi.org/10.3389/feart.2022.973385
UR - http://hdl.handle.net/10044/1/98632
VL - 10
ER -