DeltaFront Sandbody Genetic Assemblages and Their Distribution Patterns of the 4th Member of Quantou Formation in Dalaoyefu Oilfield, Southern Songliao Basin, China
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摘要: 以松辽盆地大老爷府油田白垩系泉头组四段为例，运用高分辨率层序地层学短期基准面旋回原理，详细刻画了以水下分流河道和河口坝沉积为主导的三角洲前缘储集砂体的成因组合特征，提出将其划分为水下分流河道成因组合、水下分流河道与河口坝成因组合和河口坝成因组合三种类型,并对这些储集砂体成因组合进行了详细解剖，例如，将水下分流河道成因组合划分为完整型、废弃型和多期叠加型水下分流河道组合三种亚类型；河口坝成因组合划分为完整型和叠加型河口坝成因组合两种亚类型；将复合成因砂体描述为坝上河成因组合。研究表明各种成因组合的发育受沉积基准面升降，可容纳空间增加与沉积物补给通量比值变化的控制。在此基础上，文章讨论了各种成因组合砂体在高分辨率层序地层学格架内的时空分布规律。Abstract: Taking the 4th member of Cretaceous Quantou Formation in Dalaoyefu oilfield in Songliao Basin as Example, by using the shortterm baselevel cycle theory of high resolution sequence stratigraphy, the paper shows the variety of genetic assemblages of reservoir rocks in delta front depositional system that was dominated by the distributary channel and mouth bar. It can be classified as “distributary channel genetic assemblage” “distributary channel and mouth bar hybrid genetic assemblage” and “mouth bars genetic assemblage”. Based on a detailed characterization of these genetic assemblages, the abundant genetic assemblage can reflect different sedimentary environments, for example, submerged distributary channels genetic assemblage are divided into Abandoned Type, Integrity Type and Multiphase Overprint Type; mouth bar genetic assemblage can be divided into Complete Mouth Bar and Stackmouth Bar, and the hybrid genetic assemblage is identified. The analysis shows that these sandbodies are evidently controlled by the changing of shortterm baselevel and the relation of the accompanied accommodation and sediment alimentations. On the basis of the above, this paper has also discussed the distribution model of the genetic assemblages in delta front in chronostratigraphic framework.
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Key words:
- shortterm baselevel cycle /
- genetic assemblage /
- delta front /
- Dalayefu Oilfield /
- Songliao Basin
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