【摘要】 以层序地层学理论为指导,通过地震解释和井震结合,依照层序划分原则,对二级和三级层序的特征和识别标志进行研究,提出了徐家围子西部地区的层序划分方案。将该地区深层地层划分为4个二级层序和8个三级层序。二级层序为构造层序,三级层序是由不整合面及与其对应的整合面所限定的地层单元。层序的发育是多种因素综合作用的结果,研究区的层序主要受构造、气候、沉积物供给速率、湖平面变化和火山喷发的影响,这些因素相互作用影响基准面和可容空间的周期性变化,进而影响层序的发育特征。更多还原

【Abstract】 Under the condition of sequence stratigraphic theory and sequence classification principle, the boundary characteristics and identification marks of different orders of sequences were studied based on seismic and logging data. Accordingly, sequence frameowork in the west of Xujiaweizi Area was established. The deep strata were consisted of 4 second-order sequences and 8 third-order sequences in the west of Xujiaweizi Area. Second-order sequences were tectonic sequences. Third-order sequences were bounded by unconfirmities and confirmities. The development of sequence in the west of Xujiaweizi Area is controlled by tectonic, climate, sediment supply rate, lake-level change and volcanic outbreak. All the above factors interact each other to affect the periodical change of base-level and accommodation space, and control the characteristics of sequence.更多还原