Backstripping technique is used in the recovery of subsidence history of Wells on the basis of erosion thickness that is calculated by the interval transit-time of mudstone and the sedimentation rate.

It is theoretically considered that reservoir gas-bearing makes interval transit time porosity and density porosity increase and neutron porosity decrease.

It shows that density has a better linear relation with different reservoir parameters, but the relation of sonic interval transit time or velocity with reservoir parameters is very complicated.