胜坨油田一区沙河街组二段1～3砂组高分辨率层序地层学

以高分辨率层序地层学理论和技术方法为指导,以钻井、测井资料的综合研究为基础,对济阳坳陷胜坨油田一区沙河街组二段1～3砂组进行高分辨率层序地层学分析,从中识别出超短期、短期和中期3个级别的基准面旋回层序.其中超短期和短期旋回层可划分为向上"变深"非对称型和对称型两种基本结构类型.根据旋回的结构变化特征又可细分为低可容纳空间向上"变深"非对称型、高可容纳空间向上"变深"非对称型、以上升半旋回为主的不完全对称型、近完全-完全对称型和以下降半旋回为主的不完全对称型5种亚类型.在此基础上,总结了不同结构类型的超短期和短期旋回层序的沉积序列,以及较短周期旋回在较长周期旋回中的叠加样式、变化规律和分布模式,为沙二段1～3砂组进一步的小层砂体划分、等时追踪对比、砂体几何形态和储层结构描述等精细地质研究奠定了基础.

High-resolution sequence stratigraphy of 1～3 sand beds developed in Member 2 of Shahejie Formation from No.1 area in Shengtuo oil field

On the basis of a comprehensive study of core, log data, taking the high-resolution sequence stratigraphic theory as a direction, the authors divide the base-level cycle of 1~3 sand beds developed in Member 2 of Shahejie Formation from Shengtuo oil field into three orders. They are supershort-term, short-term and middle-term. Among them, the supershort-term base-level can be divided into two basic structure types which are up-deepening non-symmetry and symmetry. Furtherly, according to the varied characteristics of cyclic structure, five subtypes of structure are distinguished and they are up-deenpening non-symmetry of low accommodation and high accommodation, complete-nearly, complete symmetry, (incomplete) symmetry dominated by uprising semi-cycle or subsiding semi-cycle. On the basis of these (studies), the depositional array of varied structure types of supershort-term cyclic sequence and the stacking pattern, the change rule and distribution pattern in the middle and short-term base level cycle sequence are summarized. All these studies lay a good foundation for tracing correlation to the sand bodies and (meticulous) describing of petroleum and gas accumulation of 1~3 sandy formation in Member 2 of Shahejie Formation from the No.1 area of Shengtuo oil field.