南海北部边缘盆地第三系沉积及主要烃源岩发育特征

南海北部边缘盆地第三系沉积及烃源岩发育，既有巨厚海相坳陷沉积的中新统烃源岩，也有分布广泛的古近系中深湖相烃源岩，油气资源较丰富。根据南海北部边缘新生代沉积盆地结构、构造特征可将其划分为走滑伸展型和断陷裂谷两大类型，前者以新近系巨厚海相坳陷沉积及海相中新统烃源岩发育为突出特点，后者则以古近系陆相断陷裂谷沉积和大规模中深湖相烃源岩、近海(河湖)沼泽相煤系烃源岩发育为主要特征，这些烃源岩的发育展布规律、有机质丰度和生烃母质类型、成熟演化特点以及生烃潜力等均差异较大。

Characteristics of Tertiary Sediments and Main Source Rocks, Northern South China Sea

Basins in Northern South China Sea belong to passive margin basins, and they are located at the junction of the Eurasian, the Pacific and the Indian-Australian plates, and also at the Superposed areas of Palaeo-Tethyan structural regimes and Palaeo-Pacific structural regimes. So the geological settings of these basins are complex, their Tertiary sediments developed well. and the phenomena of petroleum geology are rich and colorful. Based on the characteristics of framework and tectonics, the basins in Northern South China Sea can be classified into two types, strike-slip basins and rift basins. The source rocks of the former are mainly the well-developed, huge thickness ofNeogene marine depression sedimentary rocks and Miocene marine sedimentary rocks; those of the latter are significantly the rift sediments of Paleogene continental facies, and large-scale source rocks of medium-deep lacustrine facies and inshore paludal facies with coal measure strata well-developed.