The formating sedimentation model is controlled by the accommodating space to sediment sapply ratio. For river-delta sedimentary system

shale to sand ratio can be used to describe quantitatively the ratio of accommodation space to sediment supply rate. The key techniques used include:automatic recognizing log-facies

quantitative calculation of shale/sand ratio curves and log curve filtering. The techniques could considerably improve the efficiency and accuracy of the recognition of high-resolution Sequence stratigraphy.