摘要:塔木察格盆地的塔南凹陷油气资源丰富，具有很大的勘探开发潜力。塔南凹陷发育多套烃源岩（包括铜钵庙组、南屯组一段和二段、大磨拐河组），针对各套烃源岩基本特征及形成条件的研究较为薄弱。本次收集了大量研究区烃源岩的有机地球化学数据，对塔南凹陷各套烃源岩的基本特征、有机质来源和沉积环境开展了详细研究。结果表明，塔南凹陷烃源岩的有机质丰度较高，以好烃源岩和优质烃源岩为主；铜钵庙组和南一段的有机质类型以Ⅱ1型为主，南二段和大磨拐河组以Ⅱ2型和Ⅲ型为主；有机质总体处于低成熟—成熟阶段；烃源岩中的有机质为低等水生生物和陆源高等植物的混合来源；烃源岩沉积时期的水体为淡水且总体处于弱还原—弱氧化的环境，其中南屯组沉积时期比铜钵庙组和大磨拐河组沉积时期的水体环境要更偏氧化一些。
关键词: 有机质丰度/
有机质类型/
成熟度/
有机质来源/
沉积环境
Abstract:The Ta'nan Sag of Tamtsag Basin has abundant oil-gas resources, with great potential for exploration and development. There are many sets of source rocks in Ta'nan Sag, including Tongbomiao Formation, the first and second member of Nantun Formation, and Damoguaihe Formation. However, the research on the basic characteristics and formation conditions of them is relatively weak. A large number of organic geochemical data of source rocks in the study area were collected, and detailed studies on the basic characteristics, source of organic matter, and sedimentary environment of each set of source rocks in Ta'nan Sag were carried out. The results show that the abundance of organic matter in the source rocks of Ta'nan Sag is high, dominated by good source rocks and high-quality source rocks. The organic matters in the Tongbomiao Formation and the first member of the Nantun Formation are mainly of type Ⅱ1, and the second member of the Nantun Formation and the Damoguaihe Formation are mainly of type Ⅱ2 and type Ⅲ. The organic matter in the study area is generally in the low-mature to mature stage. In addition, the organic matter in source rocks is a mixture of aquatic organisms and terrestrial higher plants. Lastly, the water body of the source rock in study area is fresh water and in weak reduction to weak oxidation environments. The sedimentary environments of Nantun Formation are more oxidized than that of Tongbomiao Formation and Damoguaihe Formation.
Key words:Organic matter abundance/
Type of organic matter/
Maturity/
Sources of organic matter/
Sedimentary environment
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