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TitleExpelled oils and their impacts on Rock-Eval data interpretation, Eocene Qianjiang Formation in Jianghan Basin, China
AuthorLi, M; Chen, Z; Cao, T; Ma, X; Liu, X; Li, Z; Jiang, Q; Wu, S
SourceInternational Journal of Coal Geology vol. 191, 2018 p. 37-48, https://doi.org/10.1016/j.coal.2018.03.001
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20170303
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
AreaChina
Subjectsfossil fuels; sedimentology; geochemistry; mineralogy; petroleum resources; Eocene; petroleum exploration; hydrocarbons; resource estimation; oil; source rocks; bedrock geology; lithology; sedimentary rocks; shales; mudstones; dolomites; glauberite; evaporites; salt deposits; organic geochemistry; pyrolysis; thermal maturation; geochemical interpretations; temperature; geochemical anomalies; core samples; sedimentary environment; sedimentary facies; hydrocarbon generation; modelling; oil migration; Jianghan Basin; Qianjiang Depression; Qianjiang Formation; rock-eval analyses; expelled oils; methodology; total organic carbon; organic matter; production index; Phanerozoic; Cenozoic; Tertiary
Illustrationstables; location maps; geoscientific sketch maps; lithologic sections; profiles; histograms; plots; graphs; bar graphs
ProgramShale-hosted petroleum resource assesment, Geoscience for New Energy Supply (GNES)
AbstractSource rock samples can be "contaminated" by expelled oils from nearby mature source rocks or from the organic-rich laminae within the same source rock units. The "contaminations" on the Rock-Eval samples could produce a false high S1 peak, a high Production Index (PI), a suppressed Tmax and other anomalies. Identifying the samples affected by expelled oils, assessing and correcting the impacts are crucial in source rock study for shale oil/shale gas resource evaluation. This study analyzes the Rock-Eval 6 results of 43 core samples from two recent shale oil exploration wells of the Eocene Qianjiang Formation, a confined source rock unit embedded with salt intervals formed in a hypersaline lacustrine setting in central China. The geochemical anomalies of the affected samples are shown through the available samples in this study. Criteria for identifying the affected samples are discussed, and impacts on the conventional Rock-Eval parameters and subsequent estimation of kinetic parameters presented. This study provides insights into Rock-Eval data interpretation, particularly in source rock evaluation for estimating shale oil resources.
Summary(Plain Language Summary, not published)
Rock samples from immature source rock unit can be contaminated by expelled oils from nearby mature source rocks or from the organic-rich laminae within the same source rock units. This affects data analysis and provides false information for calculating geochemical parameters that are used to construct geological models and make petroleum resource potential estimation. Identifying the samples affected by the expelled oils and assessing and correcting the impacts are crucial in source rock study for shale oil/shale gas resource evaluation. This study analyzes the Rock-Eval 6 samples from two recent shale oil research wells of the Eocene Qianjiang Formation deposited in a hypersaline lacustrine setting in central China. Criteria for identifying the affected samples are discussed and impacts on the conventional Rock-Eval parameters and on the subsequently estimation of kinetic parameters of activation energies are presented. This study provides insights for Rock-Eval data interpretation, particularly in source rock evaluation on shale oil study.
GEOSCAN ID306340