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TitleEvaluating the total oil yield using a single routine Rock-Eval experiment on as-received shales
AuthorLi, J; Wang, M; Chen, ZORCID logo; Lu, S; Jiang, CORCID logo; Chen, G; Tian, S
SourceJournal of Analytical and Applied Pyrolysis vol. 144, 104707, 2019 p. 1-8,
Alt SeriesNatural Resources Canada, Contribution Series 20190215
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
Subjectsfossil fuels; geochemistry; Science and Technology; petroleum resources; hydrocarbons; hydrocarbons, heavy; oil shales; bedrock geology; lithology; sedimentary rocks; shales; geochemical analyses; pyrolysis; thermal analyses; temperature; thermal maturation; pore structure; pore size; modelling; models; Methodology
Illustrationsgraphs; tables; plots; profiles
ProgramGeoscience for New Energy Supply (GNES) Canadian Energy Geoscience Innovation Cluster (CEGIC)
Released2019 10 13
AbstractShales in the early maturity and oil window stages contain a considerable amount of heavy hydrocarbons (S2oil) having strong interactions with kerogen/rock that make the accurate measurement of total oil (total extractable organic matter) more difficult from the routine Rock-Eval experiment. In this study, a fast method for evaluating the total oil yield using a single routine Rock-Eval experiment on as-received shales is proposed. First, the temperature threshold (TOK) of the S2oil and cracking hydrocarbons were determined by combining the pyrograms of the as-received shale with a solvent-extracted replicate. Then, the total oil yield was directly derived from the hydrocarbons evaporate at a temperature below than TOK in a routine Rock-Eval experiment. The results show that the TOK value is controlled by the sample's maturity and pore structure. The higher the maturity, the larger the specific surface area and the smaller the pore size, the greater the TOK. A prediction model of TOK was proposed based on the sample's production index (PI). The total oil yields estimated by the two methods of both the TOK prediction model and the average TOK value (465 °C) are consistent with those obtained by Jarvie (2012) using the thermal-extraction method with correlation coefficients of 0.983 and 0.9548, respectively. Compared with the previous methods, the single routine Rock-Eval experiment method proposed in this study is convenient and not requires an extraction experiment. In addition, there are archived routine pyrolysis data available that can be used to directly calculate the total oil yield based on the temperature threshold.
Summary(Plain Language Summary, not published)
This publication talks about a way to measure the amount of oil in certain types of rocks, specifically in the early stages of oil formation. These rocks have heavy oil that's hard to measure using standard methods. The researchers came up with a faster way to do this.
They used a common lab technique called the Rock-Eval experiment. First, they figured out a specific temperature where this heavy oil starts to change. Then, they used this temperature to estimate the total amount of oil in the rock.
They found that the temperature where this change happens depends on how mature the rock is and how its pores are structured. The more mature the rock (like, the further along it is in turning into oil), the higher the temperature change point.
The important part is that this new method is quicker and doesn't need extra lab work. It's also reliable, as it gives results similar to older, more time-consuming methods. This can help geologists and scientists better understand how much oil is in rocks, which is crucial for the oil industry and environmental studies. It's important because it simplifies a process that was once more complicated.

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