The shale oil and gas resources in the Lower Jurassic Lianggaoshan Formation in the Sichuan Basin have great potential, among which the Qijiang area in southern Sichuan is a favorable resource replacement position. Through comprehensive research, identify the lithological characteristics and enrichment conditions of the Lianggaoshan Formation in the Qijiang area, and guide the next step of oil and gas exploration in the study area.Methods: Based on the exploration of both passing wells and core sampling, as well as the re-examination of old wells, this study comprehensively analyzed the lithological characteristics and shale oil and gas enrichment conditions of the Lianggaoshan Formation in the study area through detailed description of core data, organic geochemistry, and geophysical data. Results: The semi- deep lacustrine rich organic matter shale in the Lower Submember, Lianggaoshan Formation, Lower Jurassic(L. Liang- 2 Subm.), in Qijiang area is stably developed, with a thickness ranging from 20 to 35 meters and an average TOCof 1. 40%, making it a favorable exploration layer. There are a total of 5 typical lithofacies developed in the target layer, among which the high carbon silty layer type sandy shale and medium carbon silty layer type sandy shale are the most advantageous shale lithofacies. High carbon fine sand layer type sandy shale and medium carbon fine sand layer type sandy shale have reservoir characteristics of “porous coexistence, large pores and throats, and integrated pores and fractures”. At the same time, they have relatively high TOC, high porosity, good oil and gas properties, and good compressibility, which have good geological conditions for shale oil and gas reservoir formation. The enrichment conditions for shale oil and gas in the L. Liang- 2 Subm. in Qijiang area have been identified: ① Favorable sedimentary environment controls the widespread development of advantageous lithofacies, with excellent shale quality and active oil and gas display. ② The thermal evolution degree of shale oil and gas reservoirs is moderate, with the development of micro cracks, which is conducive to the enrichment and flow of oil and gas. ③ The overall structure is stable, with a wide and gentle syncline, moderate burial, and good preservation conditions. It is pointed out that the Guanshengchang syncline is the most favorable exploration target for the next step.Conclusions: The L. Liang- 2 Subm. in the Qijiang area has developed high- quality shale lithofacies in semi- deep lacustrine facies, including high carbon fine sand layer type and medium carbon fine sand layer type, with “high- quality shale development, moderate thermal evolution, developed microcracks, and good preservation conditions”. Shale oil and gas enrichment conditions are good, and multiple favorable exploration targets are developed.