摘要
下第三系沙河街组是东营凹陷最重要的生储组合。通过对沙河街组烃源岩的研究,发现厚度大、分布广的沙四段和沙三段烃源岩在有机质组成和岩性等方面存在多种尺度的非均质性。从宏观到微观系统分析烃源岩的非均质性后发现,沙河街组烃源岩的非均质性明显受其体系域、沉积相带、有机质保存条件和古生产力等多种因素控制。其中,不同的体系域和沉积相带控制了烃源岩的岩性和岩相组合及生、排烃能力,高的古生产力是有机质富集的前提,缺氧还原环境使有机质能够保存的决定因素,同时,局部环境下发育的火山活动,对优质烃源岩的形成也具有重要作用。
The Shahejie formation of paleogene system is the most important combination of source rock and reservoir in Dongying depression. According to the research of Sha 4 and Sha 3 source rock, heterogeneity is widely distributed in many aspects, including organic matter component and lithology. Macroscopic and microscopic analysis show that heterogeneity of Shahejie formation is obviously controlled by multiple factors such as systems, sedimentary facies. Organic matter conservation conditions and palaeoproductivity. Different systems and sedimentary facies control the lithology. Lithofacies combination of source rock and the capability of hydrocarbon operation and expulsion. High palaeoproductivity is the premise of organic matter enrichment. Anoxia deoxidization condition makes organic matter preservation possible. Moreover, volcanic activity is also important to high quality source rock.
出处
《矿物岩石》
CAS
CSCD
北大核心
2003年第4期95-100,共6页
Mineralogy and Petrology
基金
十五"国家重大科技攻关项目(编号:2001BA605A09)
关键词
烃源岩
非均质性
控制因素
东营凹陷
沙河街组
source rock
heterogeneity
controlling factor
Dongying depression
Shahejie Formation
