Research On Features Of Reservoir Heterogeneity And The Control Function Of Remaining Oil Of T? Oil Group In Sangtamu Oilfield

Since the exploitation in 1990 s,the Sangtamu Oilfield's comprehensive moisture content has increased gradually and the exploitation is becoming more difficult.Sangtamu Oilfield begins to carry out adjustment scheme of new stage exploitation,in order to improve the oilfield production and solve practical problems.The study of reservoir heterogeneity is the key researching content.Based on the study of reservoir heterogeneity on each block and the reservoir as a whole,the paper analyzes the degree of reservoir heterogeneity of Trias T? oil group reservoir and discusses the control effect of the reservoir heterogeneity on the formation of remaining oil.The paper provides reasonable suggestions to exploit the remaining oil according to different distributions.On the basis of previous research findings of the sedimentary system of the Tabei Rise and the reservoir characteristics of Lunnan area adjacent to the researching region,as well as the analysis of core data,earthquake,logging and laboratory test about the region,the paper argues that Trias T? oil group reservoir belongs to delta front deposition that mainly develops underwater distributary channel microfacies and channel edge microfacies,while the channel mouth bar microfacies only develop in partial reservoirs.Sand-bodies of target stratum are comparatively developed;the internal interlayers distribute erratically and the lithological characters vary a lot.Through analyzing the rock-electricity response characteristic of interlayers,the paper establishes the well logging identification standards of interlayers.Due to the researching region's partial phase change and cutting by the late fault,the sand-bodies of fault blocks have poor connectivity,resulting in big difference among the physical properties of reservoirs in different fault blocks.Through the statistical analysis of reservoirs' macroscopic parameters of inner heterogeneity,interlayer heterogeneity,and areal heterogeneity,the paper discovers that the heterogeneity degree of the reservoir as a whole is relatively strong;the physical properties of the bottom T?3 sublayer are better than those of the upper T?1 and T?2 sublayers.Using the parametric analysis of reservoir heterogeneity among different blocks,the paper also finds the LN22 block and JF123 block's heterogeneity degree is medium,but their physical properties are better than other blocks.On the basis of the above research content,the paper analyzes the effect of reservoir heterogeneity on the distribution of remaining oil.The rich regions of remaining oil are the water cones and some areas where physical properties are poor and the well network cannot control the oil.Finally,the paper provides reasonable suggestions to exploit the remaining oil.