Shale oil sweet spot section evaluation based on oil bearing characteristics in Es3L subsection of Bonan subsag in Jiyang depression
- 1College of Geosciences, China University of Petroleum
- 2Sanya Offshore Oil & Gas Research Institute of Northeast Petroleum University
- 3National Key laboratory of deep oil & gas, China University of Petroleum (East China)
Abstract
Shale oil content is commonly evaluated using Rock-Eval pyrolysis S1, but conventional S1 may underestimate total oil content because light hydrocarbons can be lost during storage and heavy hydrocarbons may remain undetected below 300 °C. This study evaluates the shale oil sweet spot interval of the lower Es3 sub-member (Es3L) in the Bonan subsag, Jiyang Depression, Bohai Bay Basin, by integrating organic geochemical data, open-system hydrocarbon generation simulation, gold-tube pyrolysis, and corrected oil-content calculation. The results show that correction of both light and heavy hydrocarbon losses improves the quantitative estimation of total shale oil content. A three-segment relationship between corrected total oil content and TOC defines the enrichment threshold for the Es3L shale, with TOC > 2.4% indicating enriched shale oil resources. Movable oil content, calculated from the difference between total oil content and adsorbed oil content, further constrains sweet spot identification. The interval of 2981–3041 m in Well L69 satisfies both enrichment and movability criteria and is therefore identified as the preferred sweet spot interval. The proposed workflow provides a practical framework for shale oil sweet spot evaluation in the Bonan subsag and comparable lacustrine shale systems.
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BibTeX
@article{wang2026shale,
title = {{Shale oil sweet spot section evaluation based on oil bearing characteristics in Es3L subsection of Bonan subsag in Jiyang depression}},
author = {Tianjiao Wang and Xiaoping Liu and Guohui Chen and Shuangfang Lu and Min Wang},
journal = {Scientific Reports},
year = {2026},
month = jul,
doi = {10.1038/s41598-026-62180-4},
url = {https://doi.org/10.1038/s41598-026-62180-4},
note = {CC BY},
}
RIS
TY - JOUR
TI - Shale oil sweet spot section evaluation based on oil bearing characteristics in Es3L subsection of Bonan subsag in Jiyang depression
AU - Tianjiao Wang
AU - Xiaoping Liu
AU - Guohui Chen
AU - Shuangfang Lu
AU - Min Wang
PY - 2026
DA - 2026/07/01
JO - Scientific Reports
DO - 10.1038/s41598-026-62180-4
UR - https://doi.org/10.1038/s41598-026-62180-4
AB - Shale oil content is commonly evaluated using Rock-Eval pyrolysis S1, but conventional S1 may underestimate total oil content because light hydrocarbons can be lost during storage and heavy hydrocarbons may remain undetected below 300 °C. This study evaluates the shale oil sweet spot interval of the lower Es3 sub-member (Es3L) in the Bonan subsag, Jiyang Depression, Bohai Bay Basin, by integrating organic geochemical data, open-system hydrocarbon generation simulation, gold-tube pyrolysis, and corrected oil-content calculation. The results show that correction of both light and heavy hydrocarbon losses improves the quantitative estimation of total shale oil content. A three-segment relationship between corrected total oil content and TOC defines the enrichment threshold for the Es3L shale, with TOC > 2.4% indicating enriched shale oil resources. Movable oil content, calculated from the difference between total oil content and adsorbed oil content, further constrains sweet spot identification. The interval of 2981–3041 m in Well L69 satisfies both enrichment and movability criteria and is therefore identified as the preferred sweet spot interval. The proposed workflow provides a practical framework for shale oil sweet spot evaluation in the Bonan subsag and comparable lacustrine shale systems.
SN - 2045-2322
ER -