萨尔图油田北三西西块高分辨率层序地层研究

Research on high-resolution sequence stratigraphy in western Beisanxi area of the Saertu oilfield

运用高分辨率层序地层学方法,综合利用测井和岩心资料对萨尔图油田北三西西块的萨、葡、高3个油组进行了精细的地层对比,识别出1个长期旋回、3个中期旋回和14个短期旋回,进一步分析短期旋回层序结构,划分出向上"变深"不对称型、向上"变浅"不对称型、向上"变浅"复"变深"对称型3种基本结构类型。以此为基础,对基准面旋回内单砂体的发育特征和空间展布规律进行研究,得出在长期基准面旋回的背景下,中期基准面旋回对砂体的发育和展布起主要控制作用的结论。

Fine stratigraphic correlation has been conducted for the Sa,Pu,Gao oil units in the western Beisanxi area in the Saertu oilfield by using method of high-resolution sequence stratigraphy and integrating logging and coring data.One long-term cycle,three medium-term cycles and fourteen short-term cycles are identified in the study area.The sequence structure of the short-term base-level cycles is subdivided into three basic types such as asymmetric upward-deepening,asymmetric upward-shallowing,and symmetric upward shallowing then deepening.On this basis,the development characteristics and spatial distribution patterns of single sands are studied within base-level cycles.It is concluded that under the background of the long-term base-level cycle,the medium-term base-level cycles had played a dominant role to the growth and distribution of the sand bodies.