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TitleGeneration kinetics based method for correcting effects of migrated oil on Rock-Eval data - an example from the Eocene Qianjiang Formation, Jianghan Basin, China
AuthorChen, Z; Li, M; Ma, X; Cao, T; Liu, X; Li, Z; Jiang, Q; Wu, S
SourceInternational Journal of Coal Geology vol. 195, 2018 p. 84-101, https://doi.org/10.1016/j.coal.2018.05.010
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20170279
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
AreaChina
Subjectsfossil fuels; geochemistry; mathematical and computational geology; petroleum resources; hydrocarbons; oil; hydrocarbon generation; oil migration; source rocks; reservoir rocks; organic geochemistry; pyrolysis; kerogen; models; whole rock analyses; software; core samples; temperature; Eocene; Qianjiang Formation; Jianghan Basin; rock-eval analyses; kinetic analyses; methodology; total organic carbon; biomarkers; activation energy; Phanerozoic; Cenozoic; Tertiary
Illustrationstables; graphs; bar graphs; histograms; stratigraphic charts; lithologic sections; logs; spectra; models
ProgramShale-hosted petroleum resource assesment, Geoscience for New Energy Supply (GNES)
Released2018 05 31
AbstractMigrated hydrocarbons occur commonly in liquid-rich source rock reservoirs and can distort analytical results of programed pyrolysis. Disregarding the effect may result in unreliable data interpretation and inappropriate hydrocarbon generation kinetics. This paper proposes a method based on kerogen kinetics for characterizing the impacts, estimating the severity and subsequently minimizing the effects by removal of the migrated components from the oil-stained samples through a numerical approach. The restored hydrocarbon pyrograms are then used for recalculation of relevant Rock-Eval parameters and proper construction of generation kinetic models. The proposed methods and workflow were applied to the source rock samples from the Qianjiang Formation, a confined source rock system imbedded in salt layers, where contamination from migrated hydrocarbons is common. An additional Rock-Eval dataset consisting of whole-rock samples and post-solvent extracted replicates was used to validate the methods. The validation results show that the proposed numerical approach is a cost-effective alternative to the traditional laboratory solution.
Summary(Plain Language Summary, not published)
Exogenous hydrocarbons occur commonly in liquid-rich source rock reservoirs and can distort analytical results of Rock-Eval pyrolysis. Disregarding the effect may result in unreliable data interpretation, overestimation of hydrocarbon resource potential, and impropriate hydrocarbon generation kinetics. This paper proposes a method based on kerogen generation kinetics for characterizing the impacts, estimating the severity and subsequently minimizing effects from the affected samples. The method is demonstrated through an application to the source rock samples from Qianjiang Formation, a confined source rock system imbedded in salt layers. Although three sub-groups of source rock with distinct geochemical characters and generation kinetics are recognized, the variations of organic matters are gradual, showing transition from one group to the others.
GEOSCAN ID306263