Abstract: It is difficult to the conventional core analysis especially measuring the saturation of unusual low permeability reservoir.Furthermore it is also difficult to well logging interpretation.So a way to solve these problems is provided. The method is as follows: (1) Porosity and permeability are measured by conventional core analysis. (2) Oil saturation of the core is measured by NMR(nuclear magnetic resonance) which can tell us more information about the distribution of fluid and the nature of fluid and so on. (3) The interpretation model of porosity, permeability and saturation are set up by using of improved NN(nerve network). This method is used in Daqing oil field F48 reservior. It is proved the method is very effective.

Key words: unusual low permeability reservoir, log interpretation, nuclear magnetic resonance, GA nerve networks