2007•Petroleum Exploration and DevelopmentRequires access

Sequence stratigraphy and depositional system of Paleogene Shahejie Formation in Liaodong Bay Depression

Xiong Zuo-wei, Cnooc Oil

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.

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Key concepts: Sedimentary depositional environment, Geology, Paleogene, Paleontology, Sequence stratigraphy, Delta, Sedimentary rock, Neogene