【摘要】 辽东湾坳陷是中国东部海上的主要含油气区之一,包括3凹2凸共5个次级构造单元,其中辽中凹陷面积最大、埋藏也最深,整个盆地充填古近系及新近系沉积。通过对全盆地范围内的地震、钻井、测井和古生物资料的综合研究,建立辽东湾坳陷沙河街组层序地层格架,将辽东湾坳陷沙河街组划分为3个二级层序,6个三级层序,并对各层序特征进行了分析对比。在层序格架内进行沉积相划分和沉积体系研究,确立辫状河三角洲、扇三角洲、深水浊积扇3种主要的沉积相类型,建立了沙河街组各个层序的沉积模式。Es4沉积范围较小,Es1+2和Es3沉积范围较大,Es3沉积水体比Es1+2沉积水体深,Es1+2层序的辫状河三角洲前缘沉积为有利勘探区带。图11参10更多还原

【Abstract】 Liaodong Bay Depression in Bohai Basin is one of the main petroleum provinces in the east of China.It includes 3 sags and 2 uplifts,5 secondary structural units in total.The Liaozhong sag is the biggest and deepest one and is filled with Paleogene and Neogene sedimentary deposit.Based on the data of seism,drilling,logging and paleontology,the sequence stratigraphy framework is built up.The strata of Shahejie Formation in the depression can be divided into three second-order sequences and six third-order sequences.The distribution characteristics of the sequences are analyzed and contrasted.The braided delta,the fan delta and deep water turbidite fan are the main sedimentary facies.The depositional model of Shahejie Formation is drawn out.The depositional area of Es4 is smaller,while those of Es1+2 and Es3 are larger.The depositional water of Es3 is deeper than Es1+2.The braided delta front of Es1+2 sequences is a favorable exploration area.更多还原