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PESA NSW May Technical Meeting 2022

Tuesday, 10 May, 2022 @ 12:00 pm - 2:00 pm (Australia/Sydney time)

$15.00 – $75.00

Guest Speaker(s): Simon George

Simon George was awarded a BSc (Hons) degree in geology from St Andrews University in Scotland in 1985 and then worked as a mudlogger. He obtained his PhD (1990) in organic geochemistry at the University of Newcastle-upon-Tyne, England, for his work on the influence of igneous activity on petroleum generation and accumulation. From 1991–2006 he worked for CSIRO in Sydney, Australia. When he left he was a Senior Principal Research Scientist leading research into the molecular geochemistry of petroleum and petroleum source rocks. He moved to Macquarie University in 2006, where he is now Professor of organic geochemistry, working especially on research areas to do with the geochemical record of the early evolution of life, petroleum geochemistry, marine geoscience, and bioremediation in cold climates. In 2014–2015 he was the Head of Department, Earth and Planetary Sciences and from 2015-2019 he was the Director of the Macquarie University Marine Research Centre. Since November 2020 he has been the Head of Department, Earth and Environmental Sciences, Macquarie University.

Overpressure release: Fluid inclusion evidence for a new mechanism for the formation of heavy oil

Heavy oils in sedimentary basins are commonly related to biodegradation and water washing, and thermal degradation of sulfur-rich kerogen at an early hydrocarbon generation stage. However, the potential for overpressure release to form heavy oil has been seldom considered and rarely demonstrated. Paragenetic sequences of diagenetic and oil charge events, pressure-temperature-composition (PTx) evolutionary history reconstruction, and molecular geochemical data from a single generation of oil inclusions reveal that heavy shale oil in the PS18–1 well in the Dongpu Depression, Bohai Bay Basin, China, was neither a product of biodegradation nor due to early oil generation during kerogen maturation. Instead, the precipitation and retention of polar compounds of a previously charged, higher-maturity oil from deeper source rocks, induced by intense pressure reduction during basin uplift, represent the most likely mechanism for the formation of the heavy oil. The precipitation of polar compounds during primary and secondary migration due to intense pressure release may be an important mechanism for explaining compositional fractionation effects in the expelled petroleum fluids in source rocks, bitumen, and heavy oil distributions in unconventional shale systems, and deep non-biodegraded heavy oils. This mechanism has wider implications for understanding the hydrocarbon distribution in overpressured basins.


Tuesday, 10 May, 2022
12:00 pm - 2:00 pm
(Australia/Sydney time)
$15.00 – $75.00
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  • Venue

    Castlereagh Boutique Hotel
    169 Castlereagh St
    Sydney, NSW 2000 Australia
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    +61 2 9284 1000
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