山东聊城石炭二叠系层序划分及海平面变化响应

Sequence Division and Eustatic Sea Level Change of Carberours-Permian Systems in Liaocheng, Shandong Province

摘要: 在钻井、测井资料分析的基础上,利用沉积学、古生物学、地层学等技术手段,识别出聊城地区的晚古生代沉积7种层序界面,并将其划分出6个三级层序。在此基础上,研究不同级别的海平面变化原因和特点。其中,三级海平面主要受冰川消融作用影响,四级海平面变化则是由三级海平面变化起主导作用或地表潜水位降低导致地层基准面下降而产生的;海平面震荡和沉积物供给变化成为五级海平面变化影响因素。总结层序地层与海平面变化、基准面旋回耦合关系,发现三者具有一致性,长期基准面受三级海平面变化的影响,形成了三级层序,四级层序并受控于四级海平面的变化,形成了体系域。五级基准面旋回受控于五级海平面变化,形成小层序。

Abstract: In our study,we analyzed the drilling and well log data,found seven sequence boundaries,and divided six third-order sequences of the Neopaleozoic sedimentation by using the technology of sedimentology,paleontology,and stratigraphy.On the basis of this,we studied the reason and characteristics of change in eustatic sea level,indicating that the third-order sea level is affected mainly by glacier melt while the fourth-order sea level is formed mainly by the change of the third-order seal evel or the lowering down of phreatic level.