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Application of Grey Analytic Hierarchy Process to Divide Flow Units——A Case from Sanjianfang Formation of Qiuling Oilfield

DONG Feng-juan1,SUN Wei1,HU Xu-jun2,JIANG Zhen21.State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China2.Shanshan Oil Production Division,Tuha Oilfield Company,CNPC,Shanshan,Xinjiang 838202,China  
The combination of quantitative and qualitative analysis is a development trend of research on reservoir flow units.The article gives a new method—grey analytic hierarchy process(GAHP),and six parameters which reflect the macroscopic properties,micro-structural characteristics and sedimentary environment characteristics:porosity,permeability,oil saturation,saturation in the value of pressure,back efficiency of mercury and clay content,have been selected to classify the flow units of Sanjianfang reservoir of Qiuling oilfield.The research indicated that reservoir flow units of the study area can be divided into 4-type mobile units as E,G,M,P.Type E mainly distributed in the center of underwater distributary channel with the strongest flow capacity,highest development degree and easily flooding.Type G mainly distributed in the underwater distributary channel with stronger flow capacity,low flooding degree and certain remaining oil.Type M mainly distributed in the underwater distributary channel's edge with poor physical properties,low operating level and rich remaining oil.Type P mainly distributed in the underwater distributary bay with dense lithology,the injected water is difficult to spread and almost has no development value.
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