储层岩相单元中饱和高度函数应用的规模效应.pdfVIP

Scale Effects on the Application of Saturation-Height Functions to Reservoir Petrofacies Units Paul F. Worthington, SPE, Gaffney, Cline Assocs. Summary independent and dependent variables used to establish them. An internally self-consistent reservoir model has been constructed Further, empirical algorithms are strictly valid only at the scale at to investigate the effects of scale on the numerical form and appli- which they have been established because the constituent coeffi- cation of four saturation-height functions and on the resulting pre- cients, exponents, and intercepts delivered by regression analysis dictions of reservoir fluid saturations. The treatment uses reservoir are known to be scale-dependent; there have been clear indications partitioning into strongly characterized, physically distinct litho- of this dependence in the broader context of petrophysics.1 units, or petrofacies, for purposes of petrophysical interpretation, Saturation-height functions should therefore be established at the and a separate, correlative reservoir zonation for subsequent scale at which they are to be applied. Because the scale of applica- parameter mapping and volumetrics. The context is therefore that tion is that of geological mapping, saturation-height functions should of a deterministic reservoir model. be established at the reservoir zonal scale. However, the source data Thenumericaldifferencebetweenapetrofacies-specificsaturation- for these functions are core measurements and well logs. For this height function calibrated at the well-l