济阳坳陷上古生界层序划分与等时格架建立

济阳坳陷上古生界地层埋藏深，受后期多期次构造运动的改造，剥蚀严重，个别地区缺失，因此，在寻找晚古生代原生气藏方面至今没能取得重大突破。为此，应用层序地层学原理和基准面旋回方法，系统地对上古生界残留地层进行了层序地层特征研究，建立了层序界面和最大海泛面识别标志，并对体系域内部特征进行了描述。对20多口井中上古生界层序地层特征的研究结果表明，济阳坳陷上古生界整体表现为1个超层序，在超层序内部划分了6个层序。对层序沉积演化特征的分析表明，该区层序1和层序2低位体系域不发育，其它层序均由低位体系域、海侵体系域和高位体系域组成。对体系域内部特征的描述表明，海侵体系域为由一系列退积叠置构成，高位体系域则由进积叠置构成。根据层序界面的标定结果，借助于测井约束反演技术，在区域地震剖面上对层序界面进行了追踪解释，建立了层序的等时地层格架。

Division of Upper Paleozoic stratigraphic sequence and establishment of isochronai stratigraphic frame in Jiyang depression.

The detailed sequence stratigraphic characteristics were researched over more than 20 wells about Upper Pale- ozoic erathem using P.R.Vail sequence stratigraphic princi- ple and analysis of base-level cycle in Jiyang depression.It was thought that the Upper Paleozoic erathem is 1 super (two-class)sequences,which was divided into 6 sequences (three-class).According to sequence depositional evolution characteristics,others were made up of low system tract, transgressive system tract and high system tract except that sequence 1 and sequence 2 did not have low system tract.Identifying criterion of the sequence interface and maximum marine surface was built,and internal character- istics in system tract were described.Transgressive system tract were superimposed by retrogradation,and high sys- tem tract were superimposed by progradation.According to sequence boundary calibration,sequence boundaries were interpreted in isochronal stratigraphie frame with logging constrained inversion technology.