| Title | Expelled oils and their impacts on Rock-Eval data interpretation, Eocene Qianjiang Formation in Jianghan Basin, China |
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| Author | Li, M ; Chen, Z; Cao, T; Ma, X; Liu, X; Li, Z; Jiang, Q; Wu, S |
| Source | International Journal of Coal Geology vol. 191, 2018 p. 37-48, https://doi.org/10.1016/j.coal.2018.03.001 |
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| Year | 2018 |
| Alt Series | Natural Resources Canada, Contribution Series 20170303 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Area | China |
| Subjects | fossil 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; Methodology; Phanerozoic; Cenozoic; Tertiary |
| Illustrations | tables; location maps; geoscientific sketch maps; lithologic sections; profiles; histograms; plots; graphs; bar graphs |
| Program | Geoscience for New Energy Supply (GNES) Shale-hosted petroleum resource assessment |
| Released | 2018 03 18 |
| Abstract | Source 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 ID | 306340 |
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