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川中—川南过渡带上三叠统须家河组可供勘探面积大,以此作为目的层的探井少,研究程度低。从有机碳含量、氯仿沥青“A”含量、干酪根显微组分特征、干酪根碳同位素组成特征、镜质体反射率等方面着手,分析了研究区须家河组烃源岩有机质丰度、有机质类型和有机质成熟度,并对研究区烃源岩进行了初步评价。分析认为该区须家河组烃源岩总体属于中等—较好烃源岩,有机质类型以腐殖型为主,煤及泥岩大多仍处于成熟阶段为主的生烃高峰期。总体上须家河组有一定的生烃物质基础,有望获得较好的勘探效果。
The middle Triassic Xujiahe Formation in the central Sichuan-Sichuan transitional belt is available for exploration with a large exploration area. From organic carbon content, chloroform bitumen “A ” content, kerogen microscopic composition, kerogen carbon isotopic composition and vitrinite reflectance, the paper analyzes the organic matter Abundance, organic matter type and organic matter maturity. The source rocks in the study area were initially evaluated. The analysis shows that the source rocks of the Xujiahe Formation in this area generally belong to moderate-better source rocks, and the organic matter types are dominated by humus. Most of coal and mudstone are still in the mature stage with the main hydrocarbon generation peak. On the whole, the Xujiahe Formation has a certain hydrocarbon-generating material base and is expected to have a good prospecting effect.