松辽盆地白垩系高分辨率层序地层格架

HIGH RESOLUTION SEQUENCE STRITIGRAPHIC FRAMEWORK IN CRETACEOUS,SONGLIAO BASIN

魏魁生 徐怀大 叶淑芬 郭占谦 徐宏 任延广 王玉华

Wei Kuisheng Xu Huaida Ye Shufen Guo Zhanqian Xu Hong Ren Yanguang Wang Yuhua

根据层序地层学的基本原理,提出以"风暴浪基面"或高水位期三角洲体系的"下超坡折"为陆架坡折的参照物,总结了松辽盆地白垩系层序边界的地震、测井及岩石学标志,划分出了时间跨度约为11.29Ma的7个二级超层序和时间跨度约为1.28Ma的47个三级层序,建立了高分辨率的地层格架。对比基准面升降曲线与海平面升降曲线,二者二级旋回变化趋势相似,唯前者的三级旋回频率高于后者,这是局部构造运动及复杂的气候因素所致。

Based on the fundamental principle of sequence stratigraphy,the storm wave base or offlap break of initial highstand delta system could be regarded as the reference for the"shelf break"in passive margin. Accoring to well log and seismic sections of sequence boundaries in cores,seven supersequences and 47 sequences are identified,and high resolution sequence stratigraphic framework is built in Cretaceous of Songliao Basin.The periods for the supersequences and sequences are about 11.29 Ma and 1.28 Ma respectively. To compare the curves of rise and fall of both the base level and sea level in Songliao Basin,their secondary cyclic variation tendencies are the same,but the frequency of third cyclic variation of the former is higher.This is caused mainly by the factors of local tectonics and complicated climate.

10.11743/ogg19970102