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  

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

作　　者：田杨[1] 叶加仁[1] 雷闯[2] 杨宝林[1] 单超[1] 何清吟 刘一茗[1] 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国石油勘探开发研究院冀东油田分公司,河北唐山063004 [3]中国地质大学图书馆,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2016年第9期1561-1571,共11页Earth Science-Journal of China University of Geosciences

基　　金：中海石油(中国)有限公司科研项目(No.102-KH126215)

摘　　要：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".Source rock in Yueguifeng Formation of Lower Paleocene is the main source rock series in Lishui-Jiaojiang hydrocar- bon generating sag of the East China Sea shelf basin. Using drilling, seismic data combined with organic geochemistry and pale- ontology data of hydrocarbon source rock, the development controlling factors for the Yueguifeng Formation of Lower Paleo- cene 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 abun- dance 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 cli- mate 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 or- ganic matter, and it could be concluded that its forming model features with ＂rapid subsidence, humid climate, aquatic organicmatter contribution, fresh-brackish water, and weak oxidation-reduction environment＂.

关 键 词：月桂峰组 烃源岩 控制因素 发育模式 丽水-椒江凹陷 沉积物. 

分 类 号：P618.13[天文地球—矿床学]