Study On Sand Body Distribution Of Gaotaizi Reservoir In Hei 60 Block Of Daqingzijing Oil Field

With the extension of water injection period in Daqingzi a block,the development of block has entered the stage of medium high water cut,and the oilfield is facing a series of problems.In the early stage of the block,the sedimentary microfacies diagram of small layer is only the macroscopic characterization of sedimentary environment and reservoir distribution,but the distribution characteristics of small layer sand body are not very detailed,so the detailed study of reservoir is urgently needed.There is no research on the distribution of remaining oil in the development stage of the block,which leads to the unclear understanding of the remaining oil distribution and restricts the next exploration.In addition,the original geological boundary can not meet the needs of fine water injection.Therefore,deepening the understanding of sand body level and clarifying the relationship between sand bodies in injection production wells are the geological basis for developing reservoir potential in the future.Through the study of sedimentary microfacies under the current well pattern conditions.According to the theory of sequence stratigraphy,sedimentology,reservoir geology,logging geology and hydrocarbon accumulation theory,the sedimentary characteristics and distribution rules of the area are studied.The sedimentary facies model of "distributary channel + front bar + sheet sand + sliding sand + lacustrine mudstone" is defined by St.stone.The Qing1 member of Qingshankou formation is divided into 16 small layers,the Qing2 member is divided into 247 small layers and the third member of Qingshankou formation It is divided into 7 segments.Through logging data interpretation,combined with oil test and production test data,oil layer I is determined.According to the identification criteria,qinghei60 sand bodies are distributed in qinghei 60 block.Qing1 and Qing2 members are mainly distributed in the front of delta front sandbodies,and thick underwater distributary channels and front sandbars are locally developed.Delta front sandbodies are mainly composed of thick underwater distributary channel and mouth bar.The sand bodies are cut and superimposed,and the thickness of surface sand body gradually thins from west to East.