关键词: 东营凹陷, 烃源岩, 湖相盆地类型, 演化, 有机质丰度, 富集有机质

Abstract: The stratigraphic sequences,lithological association,microscopic textures and organic matter of the Shahejie Formation in Dongy-ing Depression were analyzed.The impacts of lake-basin types on the occurrence of hydrocarbon source rocks were investigated.The aggradational sequence expression indicates that the lake-basin sediments in the Upper Es_2-3⁴ and the Lower Es_2-3³ sections are the balanced-filled type.Under the strong influences of climate,these two sections show great heterogeneities and high abundance of organic matter with double peak in the frequency distribution curve.The enriched solid organic matter was the main composition in microscopic scale.The Middle Es_2-3³ section had progradational sequence expression of over-filled basin characteristics.Accordingly,the influence of the climate was not so strong,and this section show less change in rock types,and hydrocarbon source rocks have lower organic abundance with a single peak in the frequency distribution curve.There only existed a little "enriched solid organic matter".The study results indicate that the Upper Es_2-3⁴ and the Lower Es_2-3³ sections are the favorable period for generating excellent hydrocarbon source rocks in Dongying Depression.

Key words: Dongying Depression, hydrocarbon source rock, lake-basin type, evolution, organic matter abundance, enriched organic matter