关于低孔特低渗砂岩油藏储量参数中有效孔隙度计算问题探讨

Discussion on calculation of effective porosity in reserve parameters of low porosity and ultra-low permeability sandstone reservoir

随着钻井、试井等工程工艺技术进步,低孔特低渗砂岩油藏不断取得勘探开发上的突破。对于该类储量参数中有效孔隙度的确定,仍采用岩心分析法,对测井资料进行定量解释和分析,因此将导致储量计算中孔隙度的计算结果存在一定的合理性问题。运用红河油田三叠系延长组长9段油藏的岩心系列实验、核磁测井等资料,探讨了低孔特低渗砂岩储层有效孔隙度计算中存在的问题。经对比分析认为,以大于孔喉半径0.1μm汞饱和度值与汞饱和度100%时的比值可作低孔特低渗砂岩储层有效孔隙度校正系数,参与储量参数中有效孔隙度计算、取值,计算结果较为合理。

With the progress of engineering technology such as drilling and well testing,the exploration and development of low porosity and ultra-low permeability sandstone reservoir continues to make breakthroughs.For the determination of effective porosity in such reserve parameters,core analysis method is still used to quantitatively interpret and analyze logging data,which will lead to some rationality problems in the calculation results of porosity in reserve calculation.The problems existing in the calculation of effective porosity of low porosity and ultra-low permeability sandstone reservoir are discussed by using the data of core series experiment and nuclear magnetic logging of triassic system yanchang formation chang-9 reservoir in Honghe oilfield.Through comparative analysis,it is considered that the ration of mercury saturation value greater than the throat radius by 0.1μm to 100%mercury saturation can be used as the effective porosity correction coefficient of low porosity and ultra-low permeability sandstone reservoir,which is participated in the calculation and value of effective porosity in reserve parameters.The calculation result is more reasonable.