渤海湾盆地埕岛地区东营组沉积特征及其油气地质意义

Sedimentary features of the Dongying Formation in Chengdao area and their geological significance

吴光华 王红亮 林会喜 汪生好 高小鹏

Wu Guanghua Wang Hongliang Lin Huixi Wang Shenghao Gao Xiaopeng

在岩心、钻测井、地震资料综合分析的基础上,确定渤海湾盆地埕岛地区东古近系在营组发育有较深水湖-浊积扇、扇三角洲-滑塌浊积扇、辫状三角洲、低弯度河-泛滥平原等沉积体系,并分析了其沉积相构成及特征。结果显示,古近系东营组沉积前的古地貌特征对东营组下部沉积具有明显的控制作用。在层序格架内沉积相构成分析的基础上,明确了沉积相的空间展布特征,并从储集砂体类型、储集砂体的分布位置、有利发育层系及空间展布特征等方面明确了沉积特征研究的油气地质意义。

The exploration focus in the Dongying Formation of Chengdao area,the Bohai Bay Basin is stratigraphic-lithologic reservoirs,to which the key is a correct understanding of deposition characteristics of reservoir sandbody.A comprehensive analysis of core,drilling/logging,and seismic data of the area,confirms the existence of sedimentary systems such as deeper lake-turbidite fan,fan delta-slump turbidite fan,braided delta,low-sinuosity stream-flood plain,and etc,and provides insights into the composition and features of these sedimentary facies.The results indicate that palaeogeomorphic characteristics before the deposition of the Dongying Formation show a strong controlling effect upon the deposition of the lower Dongying Formation.Based on sedimentary facies analysis within the sequence stratigraphic framework,the paper discusses the spatial distribution of these sedimentary facies and the petroleum geologic significances of the study on sedimentary features in such aspects as the types and distribution of reservoir sandbody,favorable strata,characteristics of spatial distribution,and so on.

10.11743/ogg20090105