Shallow Water Delta Sedimentation and Source-to-Sink Process in the South Slope Belt, Dongying Sag
Qin Yi
Zhu Shifa
Zhu Xiaomin
Jia Guanghua
Tang Dong
Chen Tao
Zhang Wei
Gao Zijie
Abstract：The study of Source-to-Sink system is a hot topic in geology research.During the sedimentary period of the second member of the Shahejie Formation (Es2),the structural stable south slope belt in the Dongying sag and its source area Guangrao uplift constituted a complete Source-to-Sink system.In this study,we analyze the paleogeomorphy,the characteristics of sediment transfer pathways and the braided shallow-water delta depositional system based on cores,logging,analytical experiment data and 3D seismic data.This paper presents in detail the sedimentary system distribution,the spatial and temporal relationship,the dominant factor of sedimentary process and sediment-dispersal patterns of the Source-to-Sink system in study area by the seismic attribute and lithology analysis.The results show there are three (i-iii) catchments,four (V1-V4) paleo-valleys from west to east in the source area.The clastic sediments supply to the deposition area,which is shore-shallow lake deposit environment gentle slope (0.52°-1.29°),by the transportation of paleo-valley.This process contributes to a moderate sorted,well rounding pebbly sandstone braided shallow-water delta system that river channel diverges frequently in the plane,several positive rhythm sediments overlay vertically.The sedimentary bodies increase from lower Es2 to upper Es2.The vertical evolution of the sedimentary system is mainly controlled by the lake-level fluctuation resulted from the paleoclimatic change.In the plane,the form and scale of the lobes body in Ⅰ-Ⅲ sedimentary area are controlled by the geomorphology vertical elevation difference of the source area,the area of the catchments,the form and scale of the pathways.It shows a positive correlation among the area of the lobes body,the vertical elevation difference and the area of the catchment.
Keywords：shallow-water deltapaleogeomorphySource-to-Sink systemseismic attributesedimentationDongying sagpetroleum geology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 2081-2094 )