塔里木盆地满加尔凹陷下古生界烃源岩的再认识  

Lower Palaeozoic source rocks in Manjiaer Sag,Tarim Basin

作　　者：赵孟军[1] 王招明[2] 潘文庆[2] 柳少波[1] 秦胜飞[1] 韩剑发[2] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油塔里木油田公司

出　　处：《石油勘探与开发》2008年第4期417-423,共7页Petroleum Exploration and Development

基　　金："十五"国家重点科技攻关项目"中国大中型气田勘探开发关健技术研究"(2001BA605A-06)

摘　　要：综合考虑下古生界烃源岩的纵向分布特征,认为塔里木盆地满加尔凹陷下古生界烃源岩主要发育中、下寒武统,中、下奥陶统和上奥陶统3套烃源岩。中、下奥陶统黑土凹组烃源岩与中、下寒武统烃源岩的沉积相特征和发育特征相似,有机质丰度高、类型好;上奥陶统烃源岩分布局限、类型差。3套烃源岩具有不同的热演化特征,以满加尔凹陷中西部地区为例,中、下寒武统烃源岩在加里东晚期—海西早期进入生油高峰阶段,中、下奥陶统烃源岩在海西晚期进入生油高峰阶段,上奥陶统烃源岩则在燕山晚期—喜马拉雅期进入生油高峰阶段。满加尔凹陷古生界烃源岩的三分法能更准确地反映下古生界烃源岩的实际分布情况,同时构筑了解决油气来源、油气成藏观点冲突的框架,能更准确认识不同地区海相原油的混源特征。Considering its vertical distribution characteristics, this article argues that the Lower Palaeozoic source rock in the Manjiaer Sag is composed of three sets of source rocks of Middle-Lower Cambrian, Middle Lower Ordovician and Upper Ordovician. The source rock of the Middle-Lower Ordovician Heituwa Formation has similar sedimentary facies and developmental features to the Middle Lower Cambrian source rock, and has abundant organic material. The Upper Ordovician source rock is poor and limited in distribution. The source rocks have different thermal evolution histories. In central and western Manjiaer Sag, Middle Lower Cambrian source rock entered oil generation peak in Late Caledonian and Early Hercynian, Middle Lower Ordovician source rock in Late Hercynian, and Upper Ordovician source rock in Late Yanshan and Himalayan. The threefold division of the source rock is the foundation of detailed study on the derived source and the accumulation process of marine oil in Tarim platform area.

关 键 词：下古生界 烃源岩 热演化史 满加尔凹陷 塔里木盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]