Research On Microscopic Seepage Characteristics Of P? Reservoir In Central Saertu Area

When the oilfild went into the high water period,because of Oil and water seepage,injection agent oil displacement,the formation and distribution of the remailing oil are occurred in the reservoir.That is bigger influenced by the reservoir of microscopic percolation characteristics.So,find out microscopic percolation characteristics in the different sand body,there are a great significance to formulate increasing production measures and explorate remaining oil effectively.Based on the reservoir geology and optical mineralogy,we combine indoor core analysis data and the results of laboratory experiments such as phase seepage curve,displacement experiment,nuclear magnetic resonance and CT scan,studied the seepage characteristics of different pore structure types: from class I to V of pore structure,small pore throat ratio is increasing,the effective seepage is reducing,the efficiency of displacement is discreasing gradually.In terms of relative permeability curve,irreducible water saturation and residual oil saturation increases gradually,the two phase seepage scope gradually narrowed;When the pore structure types became bad,the distribution of pore throat became uneven,the connectivity of pore throat,the effective seepage channel was reducing,the microscopic remaining oil was increasing.The microscopic seepage characteristics of different development stages and different sand bodies were studied.On the vertical,the average water saturation and permeability of the channel sand body have a good positive correlation,the higher the permeability,the more water saturation.The braided channel and meandering river are more than the other kinds of sand bodies.In the plane,the water flooded areas are relatively good areas of pore structure type.In different periods,the trend of porosity,permeability and water saturation increased in the channel sand and non-river sand.The variation of the parameters of non-river sand is smaller than the channel sand body.Finally,the effect of micro-seepage characteristics on recovery is analyzed,and the better the average pore structure type,the less the remaining oil.The greater the thickness of the sand,the worse the upper displacement effect;When the coefficient of variation increases,the injected water is more evenly distributed.