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High pressure water pyrolysis of coal to evaluate the role of pressure on hydrocarbon generation and source rock maturation at high maturities under geological conditions

Uguna, Clement N.; Carr, Andrew D.; Snape, Colin E.; Meredith, Will

Authors

Andrew D. Carr

COLIN SNAPE COLIN.SNAPE@NOTTINGHAM.AC.UK
Professor of Chemical Technology & Chemical Eng



Abstract

© 2014 Elsevier Ltd. This study investigates the effect of water pressure on hydrocarbon generation and source rock maturation at high maturities for a perhydrous Tertiary Arctic coal, Svalbard. Using a 25. ml Hastalloy vessel, the coal was pyrolysed under low water pressure (230-300. bar) and high water pressure (500, 700 and 900. bar) conditions between 380. °C and 420. °C for 24. h. At 380. °C and 420. °C, gas yields were not affected by pressure up to 700. bar, but were reduced slightly at 900. bar. At 380. °C, the expelled oil yield was highest at 230. bar, but reduced significantly at 900. bar. At 420. °C cracking of expelled oil to gas was retarded at 700 and 900. bar. As well as direct cracking of the coal, the main source of gas generation at high pressure at both 380. °C and 420. °C is from bitumen trapped in the coal, indicating that this is a key mechanism in high pressure geological basins. Vitrinite reflectance (VR) was reduced by 0.16 %Ro at 380. °C and by 0.27 %Ro at 420. °C at 900. bar compared to the low pressure runs, indicating that source rock maturation will be more retarded at higher maturities in high pressure geological basins.

Journal Article Type Article
Publication Date Jan 1, 2015
Journal Organic Geochemistry
Print ISSN 0146-6380
Electronic ISSN 0146-6380
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 78
Pages 44-51
APA6 Citation Uguna, C. N., Carr, A. D., Snape, C. E., & Meredith, W. (2015). High pressure water pyrolysis of coal to evaluate the role of pressure on hydrocarbon generation and source rock maturation at high maturities under geological conditions. Organic Geochemistry, 78, 44-51. https://doi.org/10.1016/j.orggeochem.2014.10.013
DOI https://doi.org/10.1016/j.orggeochem.2014.10.013
Keywords Coal, Hydrocarbon Generation, Maturation, Vitrinite Reflectance, Hydrous Pyrolysis, High Water Pressure
Publisher URL http://www.sciencedirect.com/science/article/pii/S0146638014002691
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0
Additional Information This article is maintained by: Elsevier; Article Title: High pressure water pyrolysis of coal to evaluate the role of pressure on hydrocarbon generation and source rock maturation at high maturities under geological conditions; Journal Title: Organic Geochemistry; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.orggeochem.2014.10.013; Content Type: article; Copyright: Copyright © 2014 Elsevier Ltd. All rights reserved.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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