Geological Features, Paleosedimentary Environment, and Organic Matter Accumulation Mechanisms of the Lacustrine Shale Oil System: A Case Study of the Jurassic Dongyuemiao Member in the Sichuan Basin

Lacustrine shale has garnered significant attention due to its resource potential. The Jurassic in the Sichuan Basin is an important target for lacustrine exploration China. However, previous studies have predominantly focused on Da’anzhai member of Ziliujing Formation, and little been paid other strata. This paper aims address this gap by investigating Dongyuemiao Basin. study systematically characterizes geological properties system, reconstructs paleosedimentary environment, identifies key factors influencing organic matter (OM) enrichment physical properties, assesses potential through comparative analysis. Our results show that was deposited oxic semi-humid sedimentary environment characterized intense weathering conditions. OM primarily controlled redox conditions salinity, with playing most crucial role accumulation. In terms pore system characterization, clay mineral-associated pores dominate types shale, while two matter-associated are also widely observed. development framework grain-associated limited only present certain siliceous carbonate minerals. shales exhibit slight differences TOC content. kerogen displays higher hydrocarbon generation potential, exhibits more favorable structure parameters. Overall, does not any disadvantages compared shale. Therefore, it deserves greater future endeavors. research findings presented provide a solid theoretical foundation expanding scope