哥伦比亚OMBU区古近系Em组层序地层研究

综合利用地震、测井等地质资料,运用层序地层学方法和技术,建立了层序地层格架和对比模式,对研究区古近系Em组地层的发育展布特征以及沉积环境进行了研究。Em组顶底均为区域上的不整合面,内部划分为两期基准面升降体系域。构造运动和沉积物供应控制下的基准面升级使得沉积初期研究区发育辩状河-曲流河沉积体系,至晚期演变为曲流河沉积体系。

SEQUENCE STRATIGRAPHY OF THE PALEOGENE Em FORMATION IN OMBU AREA,COLUMBIA

With the combination utilization of seismic,logging and other geological data,sequence stratigraphic framework and correlation model is established using sequence stratigraphy methods and techniques,distribution characteristics and depositional environment of the Paleogene Em Formation is further studied.The top and bottom of Em Fm.are both regional unconformity,two base-level systems tract is divided inside the formation.Tectonic movement and sediment supply control base level changes,pleading river-meandering river depositional system deposited at the beginning of Em,and meandering river systems dominated the whole area at late depositional period of Em.