东海陆架盆地丽水-椒江凹陷月桂峰组烃源岩发育控制因素及形成模式

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Ⅱ₂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”. 

Development Controlling Factors and Forming Model for Source Rock of Yueguifeng Formation in Lishui-Jiaojiang Sag,the East China Sea Continental Shelf Basin

Source rock in Yueguifeng Formation of Lower Paleocene is the main source rock series in Lishui-Jiaojiang hydrocarbon generating sag of the East China Sea shelf basin. Using drilling, seismic data combined with organic geochemistry and paleontology data of hydrocarbon source rock, the development controlling factors for the Yueguifeng Formation of Lower Paleocene are discussed and the forming model also is established based on the analysis of characteristics of the hydrocarbon source rock and tectonic-sedimentary-paleoclimate development background in this study. It is found that source rocks in Yueguifeng Formation of Lishui-Jiaojiang sag are characterized by wide distribution, large thickness and multiple thickness centers abundance of organic matter, type Ⅱ₂ dominated organic matter, and relatively high maturity. Development background of Yueguifeng Formation is an intensive separation and relatively closed lake environment with subhumid-humid subtropical climate condition, and predominantly aquatic organic matter contribution. Development of hydrocarbon source rocks in Yueguifeng Formation is mainly affected by deposit-sedimentation rate, parent material source and preservation condition of organic matter, and it could be concluded that its forming model features with "rapid subsidence, humid climate, aquatic organic matter contribution, fresh-brackish water, and weak oxidation-reduction environment".