Study on oil-water distribution law of Saertu reservoir in T66 block of Aogula oilfield

Abstract

T66 block of Aogula Oilfield is a block structure area, in which faults are relatively developed, with different oil-water systems in different fault blocks, obvious oil-water interbedding phenomenon in longitudinal direction, no unified oil-water interface and complex oil-water distribution. In order to solve this problem, the oil-water layer identification and oil-water distribution law of reservoirs in this area are studied by using drilling data and resistivity correction model, and the oil-water interpretation chart is established. The analysis shows that the whole area is controlled by fault-structure, and the oil-water difference between the two sides of the fault is large, which is obviously blocked by the fault, and the fault cutting controls the oil-water distribution Local fault blocks are controlled by structure-lithology, and the whole reservoir of high fault blocks is well developed, showing the characteristics of high oil and low water, while the reservoir of low fault blocks is discontinuous, showing the characteristics of lithologic upward dip and pinchout and lens controlling oil and water.