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本文通过对大庆油田储油砂岩高压孔隙度的测定分析,定量地研究了砂岩孔隙体积的压缩性。由于它的影响,使得储油砂岩地下孔隙度小于地面孔隙度,同时造成地下含水饱和度大于地面含水饱和度。实验证明,大庆油田储油砂岩埋深在1100米时,孔隙度下降约1%、含水饱和度上升0.84%。并以大庆油田储层为例,建立了求取地下孔隙度的公式。在储量计算中,应注意对孔隙度和含油饱和度值进行校正。我们认为,对不同地区和不同深度下储层孔隙体积的压缩性进行定量研究,确定储量参数的校正标准,使储量计算更科学化是很有必要的。
In this paper, the compressibility of pore volume of sandstone is studied quantitatively by measuring and analyzing the high pressure porosity of oil sands in Daqing Oilfield. Because of its influence, the underground porosity of oil sands is smaller than the ground porosity, meanwhile, the underground water saturation is greater than the ground water saturation. Experiments show that when the depth of oil storage sandstone in Daqing oil field is 1,100 meters, the porosity decreases about 1% and the water saturation increases by 0.84%. Taking Daqing Oilfield as an example, a formula for determining the underground porosity is established. In reserves calculations, care should be taken to correct for porosity and oil saturation values. In our opinion, it is necessary to conduct quantitative research on the compressibility of pore volume in different regions and different depths to determine the calibration standard of reserves parameters, and to make reserves calculation more scientific.