Study on Micro-Sedimentary Facies of Low Permeable Reservoir——Example from VII Pay Set in Qian'an Oil Field of Songliao Basin

Based on core and large amount of numerical logging information, micro sedimentary facies of low permeable reservoir have been distinguished automatically by software system in accordance with low permeable reservoir in Qian'an oil field. Reservoir micro sedimentary facies include underwater channel, mat-shape sand. Figures of micro sedimentary facies of three pay bed were draw up. Study on micro sedimentary facies has guiding significance to distribution of major oil layers and residual oil.