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深层碳酸盐岩往往具有孔隙度低,孔隙形态复杂的特点.传统孔隙度反演方法仅考虑孔隙空间大小对地层岩石物性的影响,未考虑孔隙形态对岩石弹性特征的作用,在反演深层碳酸盐岩孔隙度时往往存在偏差.孔隙形态的影响可以利用含有孔隙纵横比的等效介质模型表示;通过引入DEM模型对声波孔隙度方程进行改进,定量体现孔隙形态的影响.将改进的声波反演与中子反演、密度反演相结合,得到井区受孔隙形态影响的地层孔隙度.首先利用中子、密度和纵波时差反演得到地层孔隙度初值;进而通过DEM公式获得孔隙纵横比初值;最后综合利用中子测井、密度测井和声波测井数据,实现受孔隙纵横比影响的地层孔隙度反演.应用该方法反演了西南某地MX19井深层白云岩储层的孔隙度,通过与岩心孔隙度测量数据进行对比,验证了反演结果的准确性.
Deep carbonate rocks often have the characteristics of low porosity and complex pore morphology.Traditional porosity inversion method only considers the influence of pore space on the petrophysical properties of the strata and does not consider the effect of pore morphology on the elastic characteristics of the rock. The porosity of carbonate rock is often biased.The influence of pore morphology can be expressed by the equivalent medium model with the aspect ratio of pore.Improved by introducing DEM model to improve the acoustic porosity equation quantitatively reflect the influence of pore morphology.The improved The combination of acoustic inversion, neutron inversion and density inversion can obtain the porosity of the formation affected by pore morphology.At first, the initial value of porosity is retrieved by neutron, density and P- Finally, comprehensively using neutron logging, density logging and sonic log data to realize the inversion of the stratum porosity affected by the aspect ratio of the pores. This method is used to invert the deep dolomite The porosity of the reservoir is verified by comparison with the core porosity measurement data to verify the accuracy of the inversion results.