核磁共振测井在深层砂砾岩孔隙结构及有效性评价中的应用

采用孔隙度和渗透率乘积的开方作为输入参数求取转换系数,再利用最大汞饱和度可以确定核磁共振测井T2谱与压汞曲线之间的纵向转换系数(核磁共振测井T2谱积分曲线乘以最大汞饱和度),实现拟合毛细管压力曲线.连续定量求取反映储层孔喉大小、储层孔喉分选性、储层孔喉连通性的中值压力、排驱压力、最大汞饱和度、半径均值、变异系数、孔喉歪...

Application of NMR Data to Evaluation of Deep Glutenite Pore Structure and Reservoir Validity

Capillary pressure curve and T2 spectrum have high correlation.The radication of product of porosity and permeability is used as input parameter to obtain the conversion factor C,then the maximum mercury saturation is used to determine the longitudinal conversion coefficient D between NMR T2 spectrum and intrusive mercury curve(i.e.,T2 integral curve times the maximum mercury saturation),and finally,acquiring the fitting capillary pressure curve.18 microcosmic pore structure parameters,which reflect the reservoir pore throat sizes,sortings and connectivity are quantitatively and continously obtained,such as expulsion pressure,maximum mercury saturation,average radius,lithology coefficient,sorting coefficient,and the like.The corresponding parameters estimating models have been built on the basis of analyzing and comparing multiple pore structure algorithms and intrusive mercury tests.The models have higher calculation accuracy,and may be used to quantitatively analyze the reservoir pore throat radius distribution.The reservoir quality aggregate index derived from the reservoir macro and micro parameters is better for reservoir validity evaluation.