Classification Of Fluvial Reservoir Flow Unit In The North Part Of The North Section In Lamodian Oil Field

With the development of oil fields,many old reservoirs in the east of China enter the high water-bearing development period.Sustaining a high and stable production rate faces severe challenge .The key to preserve oil output in high water cut period is dependent upon the understanding degree to the properties of residual oil distribution.From 1980's,while the study of the reservoir flow unit was proceeded alongside,it has been more widely utilized to characterize reservoir feature and remnant oil distribution .Study of reservoir flow unit plays.both theoretically and practically.an important role in recognizing reservoir heterogeneity.performing a high-definition reservoir delineation and understanding the distribution of the remnant oil in the reservoir.Regarding PI1-2 oil bearing group in the polymer flooding well pattern in the north part of the north section in Lamodian Oil Field, as the target pay zone, this paper has firstly drawn the sedimentary microfacies maps of each time unit by means of the principle of architecture-element analysis and correlation method of sand member in fluvial-delta depositional system.lt gives a sound geological foundation for classification of plane flow unit.At the same time, this paper has classified vertical flow unit.Among many methods of classifing plane flow unit ,the author find that the flow unit classified by Grey Association Method not only reveal cause of formation.but also better inosculate with production performance by contrast.So the author select the Grey Association Method as the best method to classifing plane flow unit.By it the target beds in this area are divided into four types of flow unit.they are A type,B type.C type and D type. The author put forward three types of plane flow unit distribution,they are isolated distribution type.plane combination type.profile compound type.On the basis of classifing flow unit,the heterogeneity of reservoir is particularly described in study area.Combining reservoir engineering methods, the distribution laws of remaining oil in different types,or in different part of flow unit are studied. The author reveals the relationship between flow unit and remaining oil distribution.and summarizes the types of remaining oil distribution in study area,and gives the corresponding measures of tapping potential .Good results have been yielded in practice,so this convincingly validates the classification of flow unit.