博兴洼陷沙四上亚段高精度层序格架研究

博兴洼陷下第三系沙四上亚段滩坝砂体十分发育，主要是一套砂泥岩的薄互层，横向变化快，在地震剖面上难以识别和描述，用常规的地质研究方法难以预测砂体的分布趋势。本文应用高精度层序地层学的原理和方法，通过测井、岩心资料的综合分析，重点对沙四上亚段进行了高精度层序地层划分，共识别出了5个具有等时意义的水进面（四级层序界面），建立了洼陷内沙四上亚段的四级层序格架，在四级层序格架基础上进行了沉积体系分析，并对层序发育的控制因素进行了探讨。本研究对洼陷内隐蔽油气藏的进一步勘探具有重要的指导意义。

The study of high resolution sequence stratigraphic framework in upper S4 formation of Boxing depression

Beach bar sands of upper s_4 formation distribute extensively in Boxing depression,which are thin layers of sandstone and mudstone and change drastically in lateral direction and are hard to identify and describe on seismic sections.The distribution of sandstone can not be forecasted by using routine methods.High resolution sequence stratigraphy,logging and coring data are used to divide upper s_4 formation.Five isochronic transgression surfaces(sequence boundaries of four orders) are identified.Sedimentary system is analyzed on the bases of the four-order sequences and the control factors of sequence development are discussed.This research has great significance on further exploration in the depression.