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高精度层序地层为储层精细对比提供了重要手段。应用高精度层序地层学的理论和方法,以岩心、测井资料、地震资料和野外露头为基础建立了塔北隆起中部东河塘组高精度层序地层格架。塔北隆起中部东河塘组由一个完整的海平面升降旋回构成一个三级层序,以其内部相对稳定的水进面为界进行高精度层序划分,可划分出6个四级层序。通过野外露头对比、岩心观察、测井及地震特征的对比,在层序内部识别出浪控三角洲和滨岸沉积体系,明确了沉积体系的分布规律,总结了物源供给、古地貌及海平面变化等因素对沉积体系发育的控制作用。
High-precision sequence stratigraphy provides an important means of fine comparisons of reservoirs. Based on the theory and method of high-precision sequence stratigraphy, the high-accuracy sequence stratigraphic framework of Donghengtang Formation in central Tabei uplift was established based on core, log data, seismic data and outcrop. The East Hetang Formation in the middle of Tabei Uplift consists of a complete third-order sequence of sea level ascending and descending cycles. High-precision sequence stratigraphy is divided by its relatively stable water-surface inside, and six fourth-order sequences . Through the contrast of outcrops in the field, core observation, well logging and the comparison of seismic characteristics, the sedimentary system of the waves and deltas are identified within the sequence. The distribution rules of sedimentary system are clarified, and the supply of provenance, palaeogeomorphology and sea level Changes and other factors on the sedimentary system development control.