莺歌海盆地浅海环境下烃源岩有机质形成机制

为了解莺歌海盆地海相烃源岩有机质形成机制，本研究引入地球生物学方法正演烃源岩形成过程，弥补盆地样品条件的不足，再结合有机地球化学方法，综合研究莺歌海盆地海相烃源岩有机质形成机制，建立烃源岩发育模式.研究认为:莺歌海盆地中新统发育浅海相烃源岩，有机质类型以Ⅱ₂-Ⅲ型为主，为混合型生源母质，现今凹陷内大部分烃源岩处于高熟-过成熟生气阶段.海相烃源岩以古生产力和保存条件为主要控制因素，平面上，莺歌海盆地东方区中新统烃源岩发育条件优于乐东区；纵向上，梅山组可能是有利的烃源层段.研究成果为正确认识莺歌海盆地烃源岩形成机制并准确评价其资源潜力提供了重要依据. 

Formation Mechanism of Organic Matter in Source Rocks under Marine Environment in Yinggehai Basin

In order to find out the formation mechanism of organic matter in marine source rocks of Yinggehai Basin, the geobiological methods were introduced to evaluate the dynamic process of the hydrocarbon source rocks, which can make up for the poor sample conditions of the basin. Combined with organic geochemical methods, the formation mechanism of organic matter in marine source rocks of Yinggehai Basin was studied comprehensively and the development model of source rocks was established. The study shows that shallow marine source rocks are developed in the Miocene of Yinggehai Basin. The organic matter type is mainly type Ⅱ₂-Ⅲ, which is the mixed source rock. Most of the Miocene source rocks in the depression are in the high-mature to over-mature stage. Marine source rocks are mainly controlled by paleoproductivity and preservation conditions. In plane, the development conditions of Miocene source rocks in the Dongfang area of Yinggehai Basin are better than those in Ledong area. Vertically, favorable source rocks maybe distribute in Meishan formation. The research results provide an important basis for recognizing the formation mechanism of source rocks and accurately evaluating their resource potential in the Yinggehai Basin.