The Research On Sedimentary System Of Es₄ Formation In The East Of Wangjiagang Oilfield

Study area is located in the eastern section of the south slope of Dongying depression,The location is in the south of Dongying District,Dongying City,Shandong Province,south of Guangrao County.Objective interval is the fourth member of Shahejie formation(Es4),focusing on the upper part of the Es4,the formation depth of 1250-1750 m,formation thickness 400-500 m.In this paper,the classic sequence stratigraphy theory as a guide,integrated application core,well logging,seismic and other analysis data,Looking for a special response on lithology,sedimentary combined,electrical measurement curves generated on the seismic reflection characteristics,as a good sign recognition sequence boundaries,establishing standard layer,dividing the stratigraphic sequence,the establishment of the study area sequence stratigraphic framework.The upper part of the Es4 as a third-order,building Es4 top boundary of T6,the lower boundary of T7,pure lower bottom boundary T7',and contrast each sand groups and small layer standard.the sub-segment is subdivided into Es4 Cs formation and Es4 Cx formation,in which the Es4 Cs formation is divided into six groups,and under the Es4 Cx formation is divided into three groups.In this paper,the deposition theory as a guide to determine the relative signs typical core region,combined with logging data logging with the establishment of a corresponding mark on a variety of sedimentary facies and microfacies types of fine-grained,determine which mainly include delta front,beach bar with clastic,carbonate phase beach bar,shallow lake shore.Through core phase single well,well-phase and peace face analysis to determine the distribution characteristics of the study area deposition phase,and to establish the sedimentary facies model.The main study area for the beach bar sedimentary facies sedimentary facies,focus on the sand beach bar spatial distribution,clear sand beach bar sedimentary characteristics and controlling factors.That the formation and distribution of beach sand dam is mainly controlled by the role of the ancient topography,antiquities source,ancient ancient water depth and power.