Deformation characteristics of salt structures in the middle segment of eastern edge of Precaspian Basin

Using the interpretation of seismic profiles and structural mapping,the authors analyzed the deformation characteristics of salt structures in Kungurian of Lower Permian in the middle segment of eastern edge of Precaspian Basin.The results showed the deformation of Kungurian salt-bearing layer was very intensive,and salt diapirs,salt pillows,salt rollers,salt welds,salt-withdrwal minibasins and turtle structures developed well.The scales of different salt structures varied greatly and the uplifting amplitudes increased gradually from east to west with obvious zonations in plane view.The salt tectonism generated important influence on the deformation of peripheral strata,which was created wedge folded sequences and numerous faults between intrasalt and suprasalt strata. The intensive salt tectonism mainly happened in Late Permian and Triassic,which was effected by the Ural orogeny.