Fan Delta Architecture In The Third Sand Group Of The First Member Of Taizhou Formation In Chenbao Oilfield

As development goes deep,the oil and water movement law get more and more complex.The initial geology knowledge can not support the reservoir dynamic analysis.This thesis focuses on the sedimentary feature of fan delta,the reservoir heterogeneity and their distribution pattern.The main work of this thesis is the reservoir architecture feature in Tail-3 member of Chen3 Block based on the Luanping fan delta sedimentary model.The study result will be shown by the geological model,and form the basis of reservoir exploitation subsequently.The identification marks of reservoir architecture in study area had been determined.The study of architecture units is from different aspects.For example,the profile identification marks include the difference of regional curve shape,the difference of thickness,the appearance of secondary channel and interdistributary bay mud.Difference of elevation of the sandbodies top.The seven singal reservoir architecture composite pattern had been obtained by the profile identification marks:steep slope type braided channel-steep slope type braided channel,gentle slope typebraided channel-gentle slope typebraided channel,distributary channel-distributary channel,secondary channel sheetflood deposit-braided channel,braided channel-edge of channel-braided channel,sheetflood deposit-braided channel-sheetfl ood deposit.secondary channel-mouth bar-secondary channelThe superimposed relationship of the architecture units had been determined in study area.The difference of the superimposed relationship is mainly affected by autocyclicity.The asynchronous relationships of the architecture units include stand-alone type,superimposed type,cut-superimposed type.The homochromous relationships include homo-facies and heteropic-facies.The 3D geological model which is subdivided into single sandbody had been worked out.As is shown in the plane and section map,the sandbodies and flow barrier had been well described.The model which reshow the distribution of the reservoir meet the actual geological characteristics,and satisfy the needs of the reservoir simulation.