抄録
Tight oil in the Paleogene–Neogene Chaixi area of the Qaidam Basin is a strategic but complex exploration frontier. This study integrates geochemical analysis, thermal simulation, and seismic restoration to evaluate its accumulation mechanisms and resource potential. Results show that high-quality source rocks in the Ganchaigou Formations, dominated by lacustrine humic organic matter, exhibit continuous hydrocarbon generation from low-mature to mature stages. A “source-reservoir integration” model is established, driven by the spatial coupling of semi-deep lacustrine source rocks and shore–shallow lacustrine reservoirs. Structural analysis reveals that paleo-slope belts and source depression centers are primary controls for enrichment. Specifically, the Zhahaquan, Nanyishan–Xiaoliangshan, and Qigequan–Yuejin slope belts exhibit optimal accumulation conditions and high resource potential, marking them as priority targets for large-scale production. These findings refine the theoretical framework for tight oil in continental saline lacustrine basins and provide a vital reference for similar exploration globally.
