渤海湾盆地饶阳凹陷馆陶组层序地层格架及有利区带预测

Sequence stratigraphic framework and favorable zone prediction in Guantao Formation of Raoyang sag,Bohai Bay Basin

以高分辨率层序地层学和沉积学理论为指导,综合运用岩心、录井、测井及地震资料,对饶阳凹陷馆陶组层序地层和沉积相进行研究,综合分析层序地层格架下的砂体展布、储盖组合与油气分布。结果表明:馆陶组可划分为1个长期旋回、3个中期旋回与7个短期旋回;馆陶组底部两短期旋回中发育辫状河沉积,其余地层为曲流河沉积,受控于物源方向、古地貌及断裂体系,河道砂体呈近源粗带、远源细带、北北东向弯曲展布的特点;馆陶组划分为Ng3-(3+2)/Ng3-1、Ng2-2/Ng2-1及Ng1/Nm底部泥岩3套储盖组合;断层纵向输导能力强、储盖组合配置良好的留路构造带为饶阳凹陷馆陶组的有利勘探区。

Based on the theory of high resolution sequence stratigraphy and sedimentology, the sequence stratigraphy and sedimentary facies of Guantao Formation in Raoyang sag were studied by comprehensive analysis of core data, drilling data, logging and seismic data. The distribution of reservoir, reservoir-cap combination and distribution of hydrocarbon were further analyzed. The study shows that Guantao Formation is one long-term base-level cycle, which can be divided into three intermediate-term base-level cycles and seven short-term cycles. The braided river deposits are in the two short-term cycles at the bottom of Guantao Formation and other layers are meandering fluvial deposits. Controlled by sedimentary provenance, palaeo- geomorphology and fracture systems, the river channel deposits are characterized by a NNE ribbon pattern distribution, wide belt exhibition near the provenance and narrow belt exhibition far away from the provenance. Guantao Formation can be divided into three sets of reservoir-cap combination（ Ng^3-（3＋2）/Ng^3-1 ,Ng^2-2/Ng^2-1 , Ngl/Nm）. Because of the favorable reservoir-cap combination and structural condition, Liulu structural zone is the favorable zone of Guantao Formation in Raoyang sag.