對于上述討論的水飽和巖石來說，把T2分布分成束縛水和自由水時，假設短T2弛豫時間與黏土束縛水、毛細管束縛水和小孔隙水有關，該假設在含烴巖石中無效。譬如，在這種巖石中，有黏性的可動油，其T2值小于截止值。顯然，如果人們用一個截止值分析總的或合成的T2分布，則這個可動油將被誤認為是束縛水。解決這個問題的一個途徑就是使用以擴散為基礎的流體特性描述方法把
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