关键词: 随机建模, 参数建模, 变差函数, 孔隙度

Abstract: The variation of the porosity in different microfacies during the development of hydrocarbon is different.In the clustered channel facies,the distribution of porosity is controlled obviously by the width and shape of the single channel during the early production stage.The perpendicular variogram range of the porosity during the later production stage becomes greater,the distribution of the porosity becomes wider and more even,and the vertical heterogeneity becomes more intensive,because the clay minerals between grains were taken away by the fluids in water flooding performance,and the high mud content barrier between channels were removed by the fluids.In the dispersed channels,the high porosity was distributed in the center of the dirpersed channels,and the shape of the channel cannot be changed by the fluids of the water flood process,therefore,the distribution of the porosity is essentially not influenced by the water flood process,even though the properties of the flanks of channels can be changed in some extent.

Key words: stochastic modelling, parameter modelling, variogram function, porosity