Organic matter heterogeneity exerts an important impact on the generation, evaluation, and exploitation of shale oil resources. In the past, only a limited number of analytical samples that represented the contribution or influence of high or low organic matter abundance intervals were used to represent an entire set of thick source rocks, and based on this limitation, occasionally researchers have reached incorrect conclusions. Here, the heterogeneity of organic matter and its significance to shale oil in the Triassic Zhangjiatan shale of the Ordos Basin were discussed based on sedimentary and geochemical analyses. Our results indicate that (1) the Chang 7₃ shale within the study area is characterized by high abundance, good quality, strong heterogeneity, and segmented enrichment in the vertical profile. The primary organic matter type was type II₁, and this was followed by types I, II₂, and III that exhibited three changing trends in the vertical profile. Organic matter maturity is primarily at the immature stage. (2) Additionally, we observed that the organic matter heterogeneity of Chang 7₃ shale was related to changes in lithology, sedimentary environment, paleoproductivity, terrigenous influence, and event action (such as volcanism and hydrothermal processes). The abundance of organic matter is the result of the coupling control of these processes. In the process of organic matter deposition, if volcano or hydrothermal activities occurred, the organic matter was abnormally enriched, and the total organic carbon content exceeded 20% and could even be as high as 40%. (3) Finally, we observed at least nine enrichment layers that were controlled by the coupling of different geological factors, and there were four potential target resource layers corresponding to the hydrothermal sedimentary area.

有机质非均质性对页岩油资源的生成、评价和开发具有重要影响。过去，仅使用有限数量的代表高或低有机质丰度区间贡献或影响的分析样本来代表整套厚烃源岩，基于这种限制，有时研究人员会得出错误的结论。在此，基于沉积和地球化学分析，讨论了鄂尔多斯盆地三叠系张家滩页岩有机质的非均质性及其对页岩油的意义。我们的结果表明 (1) Chang 7 ₃研究区内页岩具有丰度高、质量好、非均质性强、纵剖面分段富集等特点。主要有机质类型为II _{1 型}，其次为I、II ₂和III 型，在垂直剖面上表现出三种变化趋势。有机质成熟主要处于未成熟阶段。(2) 此外，我们观察到长 7 ₃有机质非均质性页岩与岩性、沉积环境、古生产力、陆源影响和事件作用（如火山作用和热液过程）的变化有关。有机物的丰富是这些过程耦合控制的结果。在有机质沉积过程中，如果发生火山或热液活动，有机质异常富集，总有机碳含量超过20%，甚至高达40%。(3)最后，我们观测到至少9个受不同地质因素耦合控制的富集层，对应热液沉积区的潜在目标资源层有4个。