With the constant consumption of conventional oil and gas resources, unconventional oil and gas resources with great resource potential such as tight oil have gradually been valued and become the new exploration area. Jimsar Sag is the key tight oil exploration and development block in Junggar Basin of Northwestern China. Based on the data sets of geology, oil production test, logging, rock thin section, and geochemistry of Permian Lucaogou Formation (LCG), we studied the geochemical characteristics of hydrocarbon source rocks and their relation to the tight oil accumulation. Organic matter abundance of source rocks is high, the types of organic matter are mainly type I and type II, and the organic matter maturation is in the low mature stage to mature stage. Results of oil source correlation showed that the crude oil of sweet spots was mainly derived from the source rocks in the interior of the sweet spots. The LCG tight oil is mainly distributed in the plane where the source rocks have great thickness and the TOC is higher than 3.5%. It shows that the source rocks have obvious controlling on the occurrence and accumulation of tight oil.

中文翻译：

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准噶尔盆地吉木萨尔凹陷芦草沟组地球化学特征及其致密油成藏对比[J].

随着常规油气资源的不断消耗，致密油等资源潜力巨大的非常规油气资源逐渐受到重视，成为新的勘探领域。吉木萨尔凹陷是西北准噶尔盆地致密油勘探开发重点区块。基于二叠系芦草沟组地质、试油、测井、岩石薄片和地球化学等数据集，研究了烃源岩地球化学特征及其与致密油成藏的关系。烃源岩有机质丰度较高，有机质类型以Ⅰ型和Ⅱ型为主，有机质成熟度处于低成熟阶段至成熟阶段。油源对比结果表明甜点区原油主要来源于甜点区内部烃源岩。LCG致密油主要分布在烃源岩厚度较大且TOC高于3.5%的平面上。表明烃源岩对致密油的赋存和聚集具有明显的控制作用。