摘要
渤南洼陷古近系为基底岩,依据层序地层学和沉积体系分析的方法,将古近系和新近系划分为裂陷阶段和坳陷阶段2个构造层序,以区域性不整合面为界,划分为7个三级层序.渤南洼陷古近纪和新近纪为不对称断阶型湖盆,南部为缓坡断阶带,以三角洲平原和三角洲前缘沉积为主;北部为受生长断层控制的陡坡断阶带,以典型的水下扇、浊积扇和扇三角洲近端前缘沉积为主.渤南油田五区、六区位于南部缓坡带的Ⅱ区,强烈断陷期发育的沙三段9砂层组属较深水湖泊中的浊积扇体系,上覆的0～8砂层组为扇三角洲沉积体系的水下前缘组合和前扇三角洲沉积组合,总体代表了进积和湖泊充填淤浅的过程.0～9砂层组的物源应主要来自东南侧的孤岛凸起.
The sequence stratigraphy and sedimentary system analysis suggest that the Bonan sub-sag could be subdivided into 2 tectonic sequences and 7 third rank sequences. The sub-sag was an asymmetry Tertiary fault-step basin, south of which was slow fault-step belts and are mainly delta plains and delta front sediments. But in the north part of the sub-sag, controlled by the syn-sedimentary fault, steep fault-step was developed with mainly deposition of sub-aqueous fan, turbidity fan, and front of fan-delta. The sandstone groups No. 0-9 were developed from the uplift in the SE direction and the sandstone groups No. 0-8 were developed in the fan-delta environment, suggesting a main process of lacustrine filling up and prorogation.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2004年第5期30-33,共4页
Petroleum Exploration and Development
关键词
层序
沉积类型
扇三角洲
渤南油田
sequence
sedimentary type
fan-delta
Bonan Oilfield
