摘要
运用威尔(P. R. Val)等人层序地层学的新慨念,对瓯江凹陷下第三系进行了层序地层分析和研究,确定了四个区域不整合面,三套层序,每一套层序又可划分出低水位体系域,海进体系域,高水位体系域。每个体系域,在钻井上可以发现相应的各种沉积相和生物化石。沉积环境的变化,生物化石带的演变反映了海平面变化的控制作用,并能同全球海平面变化对比。
According to the guidance of the new concept of sequence stratigraphy which follows P. R. Vail etc, sequence stratigraphic analysis of Eogene System in Oujiang sag distinguishs four regional unconformities and three sequences, each of them can be divided into three tracts: Lowstand system tracts, transgressive system tracts, highstand system tracts, Each tract can be found its counterpart in the wells, which shows various sedimentary facies and biocoenose. The evolution of sedimentary enviroments, zone fossils biocoenose roughly reflect the control of sea levle changes, which could be correlative with global eustasy.
关键词
层序地层学
下第三纪
瓯江凹陷
sequence stratigraphy,tract,Eogene.Oujiang sag.
