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以高分辨率层序地层学和传统沉积学理论为指导,通过岩芯观察和测井相分析,在详细分析古城油田泌123、124区块核三段Ⅳ砂组短期、中期基准面旋回发育特征的基础上,以短期层序作为等时地层对比单元建立了Ⅳ砂组的高分辨率时间-地层格架。并进行了基准面旋回对比,遵循从点(标准井测井沉积微相分析)到线(全区多井对比)的基本原则,对古城油田泌123、124区核三段Ⅳ砂组的沉积微相类型及特征进行了详细研究。分析认为该区主要包括水下分流河道、水下分流间湾、河口坝和远砂坝、前缘席状砂5种沉积微相类型。沉积微相的精细研究为油田的下一步开发以及主力层剩余油挖潜奠定了基础。
Guided by high-resolution sequence stratigraphy and traditional sedimentology theory, through the core observation and log facies analysis, the author analyzed the short-term and medium-term cycles of the base sandstone Characteristics, based on the short-term sequence as a unit of Isochronostratigraphy, a high-resolution time-stratigraphic framework of the Nansha Formation was established. And compared with the reference plane gyration. Following the basic principles from point (standard well logging and sedimentary microfacies analysis) to line (multi-well comparison in the whole area), the sedimentation Microfacies types and characteristics of a detailed study. The analysis shows that the area mainly includes five types of sedimentary microfacies: underwater distributary channel, underwater diversion bay, estuarine bar and distal bar, and frontal sands. The careful study of sedimentary microfacies laid the foundation for the next development of the oilfield and the tapping of remaining oil in the main strata.