摘要
通过对东营凹陷箕状断陷盆地陡坡带丰深1和丰8井岩心的精细观察和描述,结合地震资料的分析,发现本区广泛发育了不同时期的砂砾岩扇体,主要类型有:冲积扇、扇三角洲和近岸水下扇等。这些砂砾岩扇体伴随着断裂活动而产生,其岩性以分选较差的粗碎屑为主,夹在湖相暗色泥岩中,综合分析认为其具有重力流性质。在地震剖面上,这些砂砾岩扇体呈现出独特的多期次的叠置沉积特征,它们的形成受构造活动、水动力条件等因素的控制形成了这种陡坡带特有的反射特征。
By finely observing and describing the drilling cores from Well Fengshen 1 and Well Feng 8 in the steep slope of Dongying Sag,and integrating the analysis of seismic data, it is revealed that the glutenite fans of different geologic ep- ochs were deposited in Well Fengshen 1 area with main types as alluvial fan,fan delta and inshore underwater fan.These glutenite fans underwent the rifting of the Sag,enveloped in the dark mudstone,and the lithology is dominated by the badly-sorted coarse fragments.Comprehensive study sug- gests that the fans are characterized by the gravity flow.On the seismic sections,the glutenite fans were emerged as a u- nique polyphase superposing sedimentation.It is the tectonic activities,hydrodynamic condition and other controlling fac- tors that bring about the unique reflectance signature.
出处
《石油地质与工程》
CAS
2008年第1期5-8,共4页
Petroleum Geology and Engineering
基金
国家"十五"重大科技攻关项目(2001BA605A09)资助
关键词
砂砾岩体
沉积特征
陡坡带
东营凹陷
glutenite fan
sedimentation feature
steep slope
Dongying sag
