Abstract:

According to the analysis of theoretical model,seismic profile and prospecting well data,the main part of the Kongxi buried-hill consists of 3～4 east-dipping listric or ramp-flat thrust faults appearing as thin-skin imbricate-fan structures.The involved beds include mainly Ordovician and Carboniferous-Permian.The thrusts converged and formed a local detachment thrust in Cambrian or Pre-cambrian.The styles of the chrusts changed along the strike of structural belt.The south part of the buried-hill presented triangle thrust helt.According to the geological date of the involved beds,the thrust structure developed after the development of Early-Middle Triassic basin but before the formation of Jurassic-Cretaceous basin and it continued to thrust during Lower-Middle Jurassic.Local structural styles became more complicated due to the stacking of extensional structures and strike-slip structures of Meso-Cenozoic.

Key words: thrust structure, structural style, Pretertiary, Kongxi buried-hill