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Lookup NU author(s): Professor Andrew Aplin,
Professor Stephen Larter,
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Volumetric liquid:vapour ratios generated using a Confocal Laser Scanning Microscope are used along with PVT modelling software to estimate the composition, PT phase envelope and isochore of single petroleum inclusions in the North Sea's Judy field. The data are used to quantify pressure histories and to determine the compositional evolution of petroleum in the field. Important constraints are also placed on the permeability structure and history of the overlying chalk. Key conclusions are: (1) quartz cementation and the emplacement of low Gas-Oil Ratio oil occurred 1-3 Ma ago in a significantly overpressured regime; (2) the present gas condensate was formed by the injection of gas-rich petroleum into a specific part of the field. Analysis of other North Sea fields suggests that many gas condensates form by the engulfment of oils by later gas. (C) 2000 Elsevier Science B.V. All rights reserved.
Author(s): Aplin AC, Larter SR, Bigge MA, Macleod G, Swarbrick RE, Grunberger D
Publication type: Article
Publication status: Published
Journal: Journal of Geochemical Exploration
ISSN (print): 0375-6742
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