博兴油田滩坝相高分辨率层序地层对比及垂向砂体展布特征

利用钻井及岩心、测井、录井等资料,对东营凹陷博兴洼陷博兴油田沙四上亚段滩坝相储层进行了高分辨率层序地层学研究,识别基准面旋回界面。将研究层段分为1个长期基准面旋回6、个中期基准面旋回、25个短期基准面旋回。将短期旋回分为向上变深非对称型短期旋回、向上变浅非对称型短期旋回和向上变深再变浅对称型短期旋回,从而最终建立起工区高分辨率层序地层框架。发现砂体在长期基准面旋回上升、下降半旋回均有发育,中期基准面上升半旋回附近砂体较发育,处于长期、中期、短期基准面旋回的从下降到上升的转换面即初始湖泛面附近砂体发育,单层较厚,物性较好;由上升到下降的最大湖泛面附近砂体不发育,短期旋回地层在不同中期基准面旋回地层中的砂体展布特征差异明显。

High-resolution sequence stratigraphic correlation and vertical sand distribution in beach-bar facies of the Boxing oilfield

High-resolution sequence stratigraphy has been studied and base-level cycle interface has been recognized for the beach-bar reservoirs in the upper part of the fourth member of the Shahejie formation in the Boxing oilfield of Donying depression by using drilling,coring and logging data.The studied section is divided into 1 long-term cycle,6 medium-term cycles and 25 short-term cycles.The short-term cycles can be divided into upward deepening asymmetrical cycle,upward shoaling asymmetrical cycle,and upward d...