OPTIMUM ESTIMATION OF THE AMOUNT OF EROSION BY POROSITY DATA：A CASE STUDY ON MINFSHUI FORMATION OF CHANGLING DEPRESSION, SONGLIAO BASIN

A new approach is introduced for the optimum estimation of the amount of erosion using primary porosity data.The method is applied on both the mudstone and sandstone from Mingshui Formation of Changling depression in southern Songliao basin.The two estimations yield similar results of about 500m of erosion.Considerations that should be taken into account in geological application are discussed at the end of the paper.