油源岩的有机地球化学特征塔里木盆地有巨厚的沉积盖层,其中主要的生油岩系有三套。一 三套油源岩的沉积特征和有机质丰度1.石炭—二叠系 石炭系以海相碳酸盐岩为主,在中、下石炭统夹有厚层的碳质页岩和石英砂岩。碳酸盐岩中含有丰富的珊瑚和腕足类等化石。在和什拉甫剖面(图1), ORGANIC GEOCHEMICAL CHARACTERISTICS OF OIL SOURCE ROCKS The Tarim Basin has thick sedimentary caprocks, of which three are major source rocks. Sedimentary characteristics and organic matter abundance of the three source rocks 1. Carboniferous-Permian Carboniferous marine carbonate rocks are mainly composed of thick carbonaceous shale and quartz sandstone in the Middle and Lower Carboniferous . Carbonates are rich in fossils such as coral and brachiopods. In the Sula Fu section (Figure 1),