济阳坳陷上第三系层序地层及沉积体系研究

综合运用岩心、测井、地震等多种资料,对济阳坳陷上第三系冲积河流相层序地层学进行了系统研究。识别了济阳坳陷上第三系层序界面,将整个上第三系划分为1个三级层序(相当于长期旋回),将研究范围内的馆陶组地层和明化镇组下段划分为3个体系域和7个准层序组(相当于中期旋回)。在全区进行连井对比基础上,建立了全坳陷的层序地层格架,总结了层序地层体制内的沉积体系的纵向演化和平面展布特征。济阳坳陷上第三系河流相沉积体系的演化经历了早期的冲积扇辫状河阶段、中期的过渡性河流阶段和晚期的高弯度曲流河阶段;各时期沉积相的平面展布在很大程度上受到古构造和古地形的控制。

Upper Tertiary Sequence Stratigraphy and Sedimentary System in Jiyang Depression

Data of cores,well logging and seism are used to study systematically the upper Tertiary alluvial-fluvial facies sequence stratigraphy in Jiyang Depression,and the Tertiary sequence interface in the depression is recognized.The whole Tertiary system is identified as one 3rd order sequence(equal to a long term cycle,the strata in Guantao Formation and the lower member of Minghuazhen Formation in the studied area are divided into 3 system domains and 7 parasequence groups(equal to mid-term cycle).On the basis of well-linking correlation,a sequence stratigraphic framework for the whole depression is established,and the characteristics of a longitudinal evolution and plane spread of the sedimentary system within the sequence stratigraphic system are summarized.The evolution of the Tertiary fluvial sedimentary system experience the early alluvial-braided river stage,mid transitional fluvial stage and late high-sinnosity fluvial stage,the plane distribution of sedimentary facies of each stage is controlled by the paleogeomorphy to a great extent.