Abstract:It is necessary to provide the distribution regularity and the growth case of formation cracks from seismic data in the course of exploring fractured reservoir in Sichuan Basin.which has.led to the adoption of many methods for determining formation curvature.In this paper these methods are presented with focuse on conditions of their application.The question of errors in estimating curvature is also discussed.and the method for eliminating errors put forward.Extracting formation urvatore parameter from seismic data enhances the ability of seismic work in solving complicated geology problems.