摘要
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。
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.
出处
《成都理工大学学报(自然科学版)》
CAS
CSCD
北大核心
2004年第2期139-147,共9页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家973项目(G1999022508)
关键词
高分辨率层序地层学
旋回结构
叠加样式
沉积序列
沙二段
胜坨油田
high-resolution sequence stratigraphy
cycle structure
stacking pattern
depositional (sequence)
Shahejie Formation
Shengtuo oil field