Study On The Heterogeneity Of Low Permeability Reservoir In The Upper Member Of Shahejie 4 Formation In The Chun 6 Block Of The Chunhua Oil Field

The upper 6 member of Shahejie Formation in pure oil field is located in the west of Dongying depression in Jiyang depression.The reservoir of beach and dam facies is developed in this area.Its physical property is poor,the heterogeneity is strong,the distribution is complex,and the development is difficult in four aspects.Therefore,it is of practical significance to study and evaluate the heterogeneity of beach and dam facies reservoir in this area.Geology,logging and reservoir dynamic data comprehensive utilization of paper,the reservoir study system based on 6 pieces of pure sand on the four sub section of the reservoir heterogeneity and its influence on the distribution of remaining oil.Based on the data of Geology and well logging,the characteristics of marker beds of upper four member of Shahejie Formation in the study area are summarized.The target section of the study area is divided into 5 sand layers and 19 small layers.In the inner layer,interlayer and plane three aspects of reservoir heterogeneity are described in detail and research;mainly through permeability heterogeneity parameters,stratification coefficient,average thickness of single sand body,sand density,drilling ratio and geometry to study heterogeneity;summarizes the interlayer distribution characteristics and inner layer,interlayer and plane heterogeneity model.Non homogeneous mode are respectively positive and opposite rhythm,rhythm and rhythm of four kinds of homogeneous composite,the composite rhythm mode: the majority of the interlayer heterogeneous models of multi-layer and docking,isolated type,the multi-layer model accounted for the majority of heterogeneous model respectively: planar sheet,strip,potato.Three,the majority of sheet mode.The parameters of reservoir quality are selected and the heterogeneous composite index is calculated.The small layer with the average value of the inhomogeneous composite index is greater than 0.6 is determined to be the dominant layer.Combined with dynamic production data,pointed out that the distribution of remaining oil in the inner layer,residual oil distribution in the lower clay content,part of the physical property is good;in the interlayer,the development of multi-layer heterogeneous model based sand group,and the development of sheet heterogeneous model based on the main advantages of small layer,residual oil relative enrichment;in the plane plane model of heterogeneous characteristics of residual oil distribution and small layer consistent sheeted heterogeneous mode of remaining oil is widely distributed,the characteristics of local enrichment,banded heterogeneity of remaining oil is "banded" distribution phenomenon,potato shaped heterogeneous residual oil pattern is "the characteristics of island type distribution.