为了深化湖相细粒岩岩相类型和成因机制，以古龙凹陷青山口组细粒岩为研究对象，利用测井曲线、岩心描述、薄片鉴定、扫描电镜（scanning electron microscopy, SEM）观察、X射线衍射和常微量元素分析等手段，提出陆源-内源二元耦合作用控制了该区富有机质细粒岩物质组分和沉积动力机制，明确古龙凹陷青山口组细粒岩物质组分包括陆地来源（陆源）和湖盆自生来源（内源）两类。基于物质来源、沉积构造和有机质含量，将古龙凹陷青山口组细粒岩划分为9类岩相：低有机质纹层状长英质泥页岩（LF1）、中有机质纹层状长英质泥页岩（LF2）、低有机质块状长英质泥页岩（LF3）、中-高有机质纹层状黏土岩（LF4）、低有机质块状鲕粒灰岩（LF5）、低有机质块状介壳灰岩（LF6）、中-高有机质块状泥-微晶白云岩（LF7）、高有机质纹层状生物硅质页岩（LF8）和低有机质介壳-粉砂混合细粒岩（LF9）。结果表明：细粒沉积岩分布受湖平面升降、古气候和水体盐度协同控制，青山口组自下而上古盐度降低、古水深减小、水体还原性减弱、陆源输入增强，青一段至青二段一亚段主要发育LF2、LF4和LF6岩相，有机质丰度高（TOC均值2.8%）、内源碳酸盐矿物及生物硅较发育，为页岩油勘探最有利层段；青二段一亚段为古环境指标突变界面，其上物质组分以陆源矿物为主，有机质含量显著降低。

In order to further elucidate the petrographic classification and genetic mechanisms of lacustrine fine-grained rocks, the Qingshankou Formation in Gulong Depression was systematically investigated through integrated analytical approaches. Comprehensive methodologies including well log interpretation, core characterization, thin-section petrography, scanning electron microscopy(SEM), X-ray diffraction(XRD), and major/trace element geochemistry were employed to evaluate the terrigenous-endogenic binary coupling processes controlling material composition and sedimentary dynamics of organic-rich fine-grained deposits. The Qingshankou Formation fine-grained rocks exhibited dual provenance characteristics, comprising both terrestrial-derived components and lacustrine authigenic materials. Nine distinct petrographic types were identified based on material provenance, sedimentary structures, and organic matter content. Low-organic laminated felsic mud shale(LF1), medium-organic laminated felsic shale(LF2), low-organic massive felsic mud shale(LF3), medium-high organic laminated claystone(LF4), low-organic massive oolitic limestone(LF5), low-organic massive coquina(LF6), medium-high organic massive mud-microcrystalline dolomite(LF7), high-organic laminated biosiliceous shale(LF8), and low-organic shell-silt mixed fine-grained rock (LF9). The results indicate that spatial distribution patterns of these lithofacies are jointly controlled by paleohydrological dynamics including lake-level fluctuations, paleoclimatic variations, and salinity gradients. Vertical evolution characteristics demonstrate upward-decreasing paleosalinity, shallowing water depth, weakening redox conditions, and enhanced terrigenous input from the formation base to top. The most favorable shale oil exploration targets are identified in the Qing1 Member to lower Qing2-1 Submember, exhibiting predominant LF2, LF4, and LF6 lithofacies with high organic matter abundance (average TOC 2.8%), well-developed authigenic carbonates, and biogenic silica accumulations. It is concluded that the Qing2-1 Sub-member represents a critical paleo-environmental transition surface, marked by abrupt shifts to terrigenous-dominated sedimentation and significant organic matter depletion. The Qing 2-1 Sub-member is identified as a critical paleo-environmental transition surface, characterized by abrupt shifts to terrigenous mineral-dominated composition and significant reduction in organic matter content.