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下古新统月桂峰组是东海陆架盆地丽水—椒江富生烃凹陷的主力烃源岩系.利用钻井、地震及烃源岩有机地球化学、古生物等资料,在烃源岩特征及其发育的构造-沉积与古气候背景分析的基础上,探讨了控制丽水—椒江凹陷下古新统月桂峰组烃源岩发育的主要因素,并建立了相应的形成模式.丽水—椒江凹陷月桂峰组烃源岩分布广、厚度大,存在多个厚度中心;有机质丰度较高,有机质类型以Ⅱ_2型为主,处于成熟-高成熟阶段.月桂峰组烃源岩发育于分割性较强、相对封闭的湖泊环境和半湿润-湿润南亚热带型气候条件,以低等水生生物贡献为主.月桂峰组烃源岩的发育主要受沉积-沉降速率、母质来源及有机质保存条件等因素控制,其形成模式可概括为“快速沉降,湿润气候,水生有机质贡献为主,淡水-微咸水,弱氧化-弱还原环境”.
The Lower Paleocene Laurel Peak Group is the main source rock series of the Lishui-Jiaojiang Fuyuan hydrocarbon depression in the East China Sea continental shelf basin.Based on the data of organic geochemistry and paleontology of drilling, earthquakes and source rocks, the characteristics of source rocks and their tectonic structures Based on the analysis of sedimentary and paleoclimate background, the main factors that control the development of source rocks of the Lower Paleo-Niufengfeng Formation in the Lishui-Jiaojiang Sag were discussed and the corresponding formation models were established.The source rocks of the Laiguifeng Formation in the Lishui-Jiaojiang Sag The rock is widely distributed and has a large thickness with multiple thickness centers. The abundance of organic matter is high, and the organic matter type is mainly type Ⅱ_2, which is in the mature-high maturity stage. The source rock of the Yueguifeng Formation developed in a strong and relatively closed Lacustrine environment and sub-humid-humid southern subtropical climatic conditions with the contribution of lower aquatic organisms.The development of source rocks in the Gui-Feng-Feng Formation is mainly controlled by factors such as sedimentation-deposition rate, source of parent material and the preservation conditions of organic matter, and its formation pattern Can be summarized as “rapid subsidence, humid climate, the contribution of aquatic organic matter, freshwater - brackish water, weak oxidation - weak reduction environment ”.