The Study On Resevoir Configuration Of Upper Part Of The Fourth Member Of The Shahejie Formation In The Q9-111 Fault Block

In this paper,under the guidance of High-resolution Sequence Stratigraphy,Sedimentology,Field Subsurface Geology and other basic theory,According to the sedimentary background and stratigraphic characteristics of the study area,the upper part(quasi sequence group)of the fourth member of the Shahejie Formation can be divided into four short-term cycles(parasequences),24 ultra-short-term cycles(small layer)through a comprehensive analysis of cores,logs and seismic data,thus subtle stratigraphic framework of the study area is established.On the basis of a comprehensive analysis of petrology,structural,sedimentary structures,logs,rhythm features and other signs,We can identify that this area mainly develop the fan delta front with the background of shallow.By means of sedimentary facies,we can carry out the study of reservoir configuration feature.Based on observing and analysis of coring wells,the hierarchical division and identifying characteristics of reservoir architecture interface is determined clearly.Through integrating analysis of lithology,sedimentary structures,logging characteristic,the sedimentary facies and reservoir structure is discussed.Delta-front facies is the major deposition system which concludes underwater distributary channel,underwater natural levee,mouth bar,sheet sand,interdistributary bay,frontal delta mud structure unit in the study area.By drawing cross-section graph,plane distribution graph and three dimensions pattern diagram,the longitudinal and plane distribution characteristics of the first block of Qudi oilfield is analyzed systematically.By means of analyzing the Influencing factors of remaining oil and reservoir configuration features,we can conclude that The effect of different grades of sand bodies on the remaining oil is different.Single channel configuration control the remaining oil by the forth-level configuration and the laminated mud;composite sand body configuration control the remaining oil by plane phase change and vertical phase change sand body,in addition,we can analysis the remaining oil by microstructure.