江家店地区沙三段高分辨率层序地层研究

Study of high resolution sequence formation of Sha-3 member in Jiangjiadian area

1. 中国地质大学能源学院，北京100083;2. 中国地质大学地球探测与信息技术学院，北京100083

College of Energy Resource, China University of Geosciences, Beijing 100083,China

以钻/测井、高分辨率三维地震资料为基础,以多级次基准面旋回为参照面的高分辨率层序地层理论为指导,对惠民凹陷沙三段不同级别的基准面旋回层序进行分析,从中识别出4个中期旋回,从上至下命名为C1,C2,C3和C4旋回,由此建立了惠民凹陷沙三段的层序地层对比格架。在区域层序地层格架的基础上,根据岩性和电性资料,对研究区沙三段开展了高频层序划分与对比,共识别出9个短期基准面旋回。以短期旋回为基本的时间地层单元,在连井剖面的层序地层对比基础上,建立了江家店地区高分辨率层序地层对比格架。在高频层序内研究了沉积微相的构成与演化特征以及储层分布规律。最后在高精度层序划分与对比、层序的沉积微相构成分析、砂体分布规律研究基础上,对有利的岩性圈闭勘探目标区作出了预测。

Based on comprehensive study of seismic data, well logging and drilling data, different base levels of cycles in Sha-3 member are analyzed, with 4 mid term cycles named C1, C2, C3, and C4 cycle, recognized according to the theory of high resolution sequence stratigraphy for dividing multiple grade base level cycles. On the basis of this, the sequence stratigraphic framework of Sha-3 member in the depression is built. Then the high-frequency sequence of Sha-3 member is divided and contrasted, with 9 short-term base level cycles being recognized according to the lithologic and electric data. By regarding the short-term cycle as the basic time stratigraphic unit, the sequence strata on linked-well section are contrasted and the high-resolution sequence stratigraphic framework in Jiangjiadian area established. The constitution and e-volution features of sedimentary facies and reservoir distribution rules are studied within the high frequency sequence. At last, favorable exploration target area is predicted based on high frequency sequence division and comparison, constitution analysis of sequence sedimentary microfacies, and sand body distribution.