2026-10-11T21:46:57Z https://www.scidb.cn/oai

10.57760/sciencedb.36854 2026-05-21T14:04:47Z

2026-05-21 Pore-Scale Fluorescence Evidence for Mineral-Controlled Oil Fractionation in Lacustrine Shale doi:10.57760/sciencedb.36854 en Continental shale-oil reservoirs are highly heterogeneous, and understanding of their microscale occurrence states and the differentiation mechanisms of light and heavy components remains limited, which constrains sweet-spot evaluation and development optimization. Taking shale samples from the Shahejie Formation in the Dongying Sag as the study object, this study integrates XRD, TOC, Rock–Eval pyrolysis, low-temperature N₂ adsorption, scanning electron microscopy, single-mineral adsorption experiments, laser-scanning confocal microscopy, and fluorescence lifetime imaging microscopy (FLIM) to investigate the relationships among mineral composition, pore structure, and shale-oil component differentiation. The results show that the studied interval is dominated by calcareous shale and mixed shale, and that mineral composition significantly affects pore structure and shale-oil occurrence characteristics. Clay-rich samples generally develop more nanoscale pores and are more likely to retain heavy components, whereas carbonate-associated pore systems, especially those related to calcite, are more favorable for the occurrence and migration of light components. FLIM-based imaging reveals the spatial differentiation of fluorescence-active light-oil-associated and heavy-oil-associated domains under different mineralogical backgrounds. Grouped comparisons further suggest that samples with relatively higher maturity tend to show enrichment of light components and relative depletion of heavy components, although sample-level variability remains evident. This study applies FLIM to the microscale in situ characterization of SARA-related fluorescent domains in shale oil, providing new microscopic evidence for shale-oil occurrence mechanisms within the coupled “mineral–pore–fluid” framework. SARA fractions; Mineralogical composition; Fluorescence lifetime imaging microscopy Yuchen Wang Qiansong Guo Hongyu Wang Xianda Sun Chunjing Lu PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank