东濮凹陷文99块油藏沙二下亚段高分辨率层序地层分析

本文利用测井资料,借助岩心资料,运用高分辨率层序地层学理论及方法,对东濮凹陷文99块油藏沙二下亚段进行不同级次的基准面旋回层序划分,识别出1个中期、5个短期、19个超短期基准面旋回层序,并对短期基准面旋回层序的结构类型和叠加样式进行较为深入的讨论。同时,在对关键井文117井单井分析的基础上,以二分时间单元分界线为优选等时对比标志,对不同级次的基准面旋回进行了较高精度的等时对比,建立了研究区沙二下亚段高分辨率层序地层格架。

High Resolution Sequence Stratigraphy Analysis of Es2L in W99 Fault Block Reservoir in Dongpu Depress

The different base levels of cycles in the lower sub-member of Es2 in Wen 99 fault block reservoir in Dongpu depress were studied based on the principle and methods for high resolution sequence stratigraphy and the data from the well logging and core sample.1 medium-term stratigraphic base level cycle and 5 short-term stratigraphic base level cycles and 19 super-short-term stratigraphic base level cycles were recognized in this area,and a further discussion on sequence structure and stacking pattern of short-term stratigraphic base level cycle was given in this paper.Meanwhile,on the basis of single well analysis,higher accuracy isochronostratigraphic correlation was done at the different order base level cycles,for which half time unit boundary was selected as optimum correlation marker,and in the end a sequence stratigraphic framework of the lower sub-member of Es2 was built.