东海盆地台北坳陷白垩系烃源岩成熟度及生烃期次研究

东海盆地是中国海上油气重点勘探区域之一，对其早期研究的重点是第三系烃源岩，但对前第三系烃源岩的研究较少。根据盆地热史恢复结果对前第三系地层（白垩系烃源岩）的生烃状况及成熟度进行了研究，结果表明：白垩系烃源岩在古新世末经历了高的古热流（平均为83.4 mW/m2），这就决定了白垩系烃源岩成熟度在古新世前后变化有明显的不同，古新世前白垩系烃源岩成熟状态变化快、变化幅度大、成熟度高，古新世后的变化则相对缓慢；白垩系烃源岩的生烃期次主要出现在白垩纪晚期和古新世末，但受后期沉积过程影响，在始新世温州组沉积期和中新世以来也出现有生烃过程。

Maturity and Hydrocarbon Generation Stages of Pre-tertiary Source Rocks, Taibei Sag, East China Sea Basin

Based on the reconstruction of thermal history in East China Sea Basin (ECS), the maturity and hydrocarbon generation of the pre|tertiary source rocks are discussed. The thermal history reconstruction using vitrinite reflectance shows that the Mesozoic source rocks (Cretaceous source rocks) experienced higher paleo|heat flow at the end of the Paleocene with a value of 83.4 mW/m2. The thermal history decides the differences of the source rocks evolution before and after the Paleocene. Before the Paleocene, the maturity of source rocks change rapidly. Then, the source rocks mature slowly. The main hydrocarbon generation stage of the Cretaeous source rocks is from the later Cretaeous to the Paleocene. Because of the effects of sedimentation, the source rocks generate hydrocarbon again during the Eocene and the Miocene.