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东营三角洲是东营凹陷古近系沙河街组沙三段的主要沉积体系之一,为一大型复合三角洲。该三角训形成的浊积砂体岩性圈闭是东营凹陷沙三段重要的勘探目标,近几年平均每年发现的岩性油藏石油储量超过千万吨。为了给东营三角洲隐蔽油气藏进一步的勘探提供科学依据,运用高分辨率层序地层学理论和分析方法,在建立高频层序地层格架的基础上,研究东营三角洲演化过程、古构造坡折发育类型及不同期次三角洲与构造坡折的配置关系,分析这些因素对岩性圈闭形成的重要作用,认为在进积时期推进距离较远(三角洲进积作用大于加积作用)、退积时期湖泛规模较大条件下发育的三角洲朵叶体易形成具有一定规模的浊积扇。
Dongying Delta is one of the major sedimentary systems of the third member of Shahejie Formation in the Dongying Sag. It is a large composite delta. The turbidity-trapped lithologic traps formed by the Triangular training are important exploration targets of the third member of Shahejie Formation in Dongying Depression. In recent years, the average annual oil reserves of lithologic reservoirs discovered over 10 million tons. In order to provide a scientific basis for the further exploration of subtle reservoirs in the Dongying Delta, the high-resolution sequence stratigraphy theory and analytical method were used to establish the high-frequency sequence stratigraphic framework and to study the evolution of the Dongying delta, The type of development and the disposition relationship between different stages of delta and structural slope break. The important role of these factors on the formation of lithologic traps is analyzed. It is considered that the propulsion distance is far away during the progradation (the sedimentation of the delta is greater than that of accretion) During the period of the lake, the delta leaf body developed under the larger scale of pan-lake formed the turbidite fan with a certain scale.