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TitleHydrocarbon evaporative loss evaluation of lacustrine shale oil based on mass balance method: Permian Lucaogou Formation in Jimusaer Depression, Junggar Basin
AuthorChen, J; Pang, X; Pang, H; Chen, Z; Jiang, C
SourceMarine and Petroleum Geology vol. 91, 2018 p. 422-431, https://doi.org/10.1016/j.marpetgeo.2018.01.021
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20180135
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
AreaChina
Subjectsfossil fuels; geochemistry; petroleum resources; hydrocarbons; oil shales; bedrock geology; lithology; sedimentary rocks; shales; lacustrine deposits; source rocks; models; organic geochemistry; pyrolysis; hydrocarbon generation; vitrinite reflectance; kerogen; thermal maturation; Lucaogou Formation; Jimusaer Depression; Junggar Basin; methodology; hydrocarbon evaporative loss; unconventional energy resources; mass balance; rock-eval analyses; total organic carbon; Phanerozoic; Paleozoic; Permian
Illustrationsmodels; location maps; geoscientific sketch maps; stratigraphic columns; plots; profiles; tables
ProgramShale-hosted petroleum resource assesment, Geoscience for New Energy Supply (GNES)
Released2018 01 31
AbstractHydrocarbon evaporative loss evaluation is important for shale oil resource assessment. We propose a mass balance model to evaluate the hydrocarbon evaporative loss (S1-loss) in this study. The proposed method is applied to a large Rock-Eval pyrolysis dataset on source rock samples from the Lucaogou Formation in the Jimusaer Depression of the Junggar Basin, NW China, as a case study to evaluate the S1-loss. The results indicate that the S1-loss can range from 0.12 to 7.25 mg/g Rock, corresponding to 11%-89% loss of the generated hydrocarbons (S1-loss/(S1+S1-loss)) due to evaporation before lab analysis. It appears that when Ro>1.3%, S1-loss and S1-loss/TOC decreases gradually with increasing Ro, likely corresponding to increasing oil density as results of heterogeneous source rock compositions and increased accommodation space via the creation of organic pores of large specific surface for heavy and large hydrocarbon molecules in oil window. When Ro>1.3%, S1-loss/TOC begins to increase with increasing Ro as more oil crack to gaseous and light hydrocarbons that are more susceptible to evaporative loss. In the case of similar Ro, the relative S1-loss/TOC varies little among the samples but the absolute S1-loss amount increases with increasing TOC. Restricted by regional geological conditions in this study, we focused on the S1-loss for lacustrine type I kerogen only, and quantification of evaporative loss for other kerogen types remains a subject for further study.
Summary(Plain Language Summary, not published)
Hydrocarbon evaporative loss evaluation is important for shale oil resource assessment. We propose a mass balance model to evaluate the hydrocarbon evaporative loss (S1-loss) in this study. The proposed method is applied to a large Rock-Eval pyrolysis dataset on source rock samples from the Lucaogou Formation in the Jimusaer Depression of the Junggar Basin, NW China. The results indicate that the S1-loss can range from 0.12 to 7.25 mg/g Rock, corresponding to 11%-89% loss of the generated hydrocarbons due to evaporation before lab analysis. It appears that when maturity lower than gas generation window, S1-loss and S1-loss/TOC decreases gradually with increasing maturity. When source rock entering gas generation window, S1-loss/TOC begins to increase with increasing maturity as more oil cracks to gaseous and light hydrocarbons that are more susceptible to evaporative loss.
GEOSCAN ID308427