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基于烃源岩的类型、分布,有机质的丰度、成熟度等方面的分析,对中上扬子地区二叠系烃源岩的特征进行了详细研究,并对烃源岩发育的控制因素进行了探讨。研究表明:中上扬子地区二叠系烃源岩主要为暗色碳酸盐岩、暗色泥(页)岩和煤,薄层硅岩也是潜在的烃源岩;其中中二叠统烃源岩以暗色碳酸盐岩为主,上二叠统烃源岩以暗色碳酸盐岩和暗色泥(页)岩为主;栖霞阶和茅口阶烃源岩厚度较大,分布较广;吴家坪阶和长兴阶烃源岩厚度相对较小,分布相对较局限;川西北—川东北—渝东—鄂西—黔北—黔中地区是各阶烃源岩分布的叠合区,是有利的生烃区带;研究区二叠系烃源岩的发育与沉积环境和上升流作用的关系密切,沉积环境控制着烃源岩的岩石类型和有机质丰度,中二叠统优质烃源岩的发育还与上升流的作用有关。
Based on the analysis of types and distribution of source rocks, abundance and maturity of organic matter, the characteristics of Permian source rocks in the Middle Upper Yangtze region have been studied in detail and the controlling factors for the development of source rocks have been studied Discussion. The results show that the Permian hydrocarbon source rocks in the Upper-Upper Yangtze region are mainly dark-colored carbonate rock, dark mudstone, coal and thin-bedded silicon rock, and are also potential source rocks. The Middle Permian hydrocarbon source rock Dark carbonate rocks, and Upper Permian source rocks are mainly dark-colored carbonate rocks and dark-colored muds (Page Rocks). The Qixia and Maokou source rocks are thick and widely distributed. The Wujiaping And the Changxing order source rocks are relatively small with relatively limited distribution. The NW-East Sichuan-East-West Hubei-Guizhou-Guizhou-Central Guizhou region is a superimposed area of source rocks with favorable order Hydrocarbon zone. The development of Permian hydrocarbon source rocks in the study area is closely related to the sedimentary environment and upwelling flow. The sedimentary environment controls the rock type and organic matter abundance of source rocks, and the development of the Middle Permian high-quality source rocks Also related to the role of ascending currents.