兩個經(jīng)驗滲透率公式--SDR公式(斯倫貝謝Doll研究中心)和Timur-Coates公式被廣泛用于石油工業(yè)。NMR滲透率公式可估算水飽和砂巖中的鹽水滲透率 對于許多砂巖來說，孔隙本身和孔喉大小之間具有很好的相關性，這是計算NMR滲透率的重要基礎。兩個滲透率測量值都含有模型參數(shù)(如指數(shù)和比例常數(shù))。服務公司所采用的缺省值通常能提供定性準確的NMR滲透率曲線(可用來比較兩個層的滲透率)。盡管這些信息有價值，但估算的滲透率會明顯地偏離地層的真實滲透率。要定量估算特殊巖石的準確滲透率，建議對巖樣的測量結(jié)果進行分析，從而確定最優(yōu)的滲透率方程參數(shù)。SDR和Timur-Coates滲透率的計算都受烴影響，需要更多的研究來提出預測烴和水相對滲透率的公式。
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