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Abstract
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Article Information:
Maturity Assessment and Characterisation of Jurassic Crude Oils
K.S. Okiongbo
Corresponding Author: Kenneth S. Okiongbo
Submitted: 2010 December, 16
Accepted: 2011 January, 20
Published: 2011 April, 05 |
Abstract:
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In this study, the thermal maturity of crude oil samples from the Kimmeridge Clay Formation (UK)
were assessed and characterised using the following methods: calibration of the oil samples against source rock
biomarker dataset of which the maturities are known, use of established empirical relationships between
Vitrinite Reflectance Equivalent (VRE) and aromatic molecular ratios, use of phase diagram as a relative
maturity indicator and use of GOR as a relative maturity indicator. The results show that the biomarker maturity
parameters are only diagnostic of a broad maturity range (VRo ~ 0.65-1.0%), aside, there was no significant
increase in the ratios of virtually all parameters (e.g., %29ββ sterane, %29αα sterane, %27Ts, %29Ts) in this
maturity range, and in most cases their inversion complicates their application. Vitrinite reflection equivalent
(VRE) values derived from the aromatic molecular ratios mainly range from ~0.64-0.89%. These results
indicate that virtually all the oils are early mature to mid mature. This assertion is only broadly true as
reservoired oils are mixtures of petroleums from source rocks at different levels of maturity. Our dataset also
displays poor correlation between GOR and biomarker/aromatic related maturity parameters, indicating the
need to (a) carefully consider how these parameters should be used and (b) unravel the effects of petroleum
mixing when looking for trends between maturity and bulk composition.
Key words: Aromatic, biomarker, crude oil, gas oil ratio, thermal maturity, vitrinite reflectance equivalent,
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Cite this Reference:
K.S. Okiongbo, . Maturity Assessment and Characterisation of Jurassic Crude Oils. Research Journal of Environmental and Earth Sciences, (3): 254-260.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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