摘要
通过碎屑颗粒类型与含量、特征元素比值分布模式等方法,对东营凹陷滨南—利津地区沙四上亚段砂体物源进行系统分析。沙四上亚段沉积时期,该地区存在两大物源体系:来自陈家庄凸起的利津物源体系和来自滨县凸起的滨南物源体系。滨南物源体系碎屑沉积物以石英含量高、变质岩岩屑含量高的砂岩为主,且碎屑颗粒粒度细;利津物源体系以石英含量低、沉积岩岩屑含量高的砾岩、含砾砂岩、砂岩为主,碎屑颗粒粒度粗。由于物源母岩性质的差异及古地貌特征和构造演化特征不同,两个物源体系发育不同的砂体类型,具有不同的沉积特征。滨南物源体系主要发育扇三角洲、辫状河三角洲和滨浅湖滩坝等砂体,利津物源体系主要发育近岸水下扇、浊积扇等砂体。
The provenance of the sandbodies of the upper part of the fourth member of the Shahejie Formation in Binnan-Lijin area of Dongying depression was studied by the methods of types and content of detrital grain and the distribution patterns of the ratio of characteristic elements.There were two provenance systems in the fourth member of the Shahejie Formation in Binnan-Lijin area,including Lijin provenance system from Chenjiazhuang uplift and Binnan provenance system from Binxian uplift.The detrital grain was fine and the sand with high quartz and high metamorphic lithic contents was the main clastic sedimentary in Binnan provenance system.The detrital grain was coarse and the sand with low quartz and high sedimentary lithic contents was the main clastic sedimentary in Lijin provenance system.The different provenance systems developed different sandbody types and depositional characteristics because of different mother rock properties,paleogeomorphic and tectonic evolution characteristics.The fan delta,braid delta and beach bar were the main sandbody types in Binnan provenance system.The nearshore subaqueous fan and turbidite fan were the main sandbody types in Lijin provenance system.
出处
《现代地质》
CAS
CSCD
北大核心
2010年第2期321-328,共8页
Geoscience
基金
国家油气重大专项(2008ZX05051-02-01)
关键词
东营凹陷
沙四段
物源分析
沉积特征
Dongying depression
the fourth member of Shahejie Formation
provenance analysis
depositionalcharacteristic
