摘要
受晚白垩世仪征运动的影响,苏北盆地拉张断陷,沉积基准面上升,从而形成了比较完整的安丰退积型辫状三角洲沉积体系。湖面的升降和物源的摆动使辫状三角洲沉积体系中发育夹层。夹层类型主要有泥岩夹层、粉砂质泥岩夹层、灰质夹层、泥灰质夹层和砾石质夹层5种。夹层的平面分布特征有层状连续分布、片状不稳分布和不规则冲刷充填分布3种。
Because of Yizheng orogeny in Late Cretaceous,braided delta system of Anfeng was formed by rifting in Subei Basin and rising of sedimentary base level.Eustatic lake level and source change had resulted in intercalation development in braided delta system.The intercalations are divided into five types,such as muddy intercalation,silty intercalation,calcareous intercalation,marly intercalation,and gravel intercalation.Planar intercalations are divided into three types,such as continuous laminar intercalation,unstable sheet intercalation,and irregular alluvial fill intercalation.
出处
《特种油气藏》
CAS
CSCD
2006年第3期22-25,共4页
Special Oil & Gas Reservoirs
基金
2001年中国石化"十条龙"科技攻关项目"复杂断块油田提高采收率技术研究"子项目"江苏复杂断块油田提高采收率技术研究"部分研究成果(项目编号:P01040)
关键词
辫状三角洲
沉积特征
沉积微相
夹层
分布特征
苏北盆地
braided delta
sedimentary characteristic
sedimentary microfacies
intercalation
distribution characteristics
Subei Basin
