Abstract:

Tazhong lower uplift forming during Paleozoic was a favorable area for hydrocarbon migration and accumulation, so it's very important to study the structural distortion character for petroleum exploration. Based on seismic and well data, seismic interpretation and restoration of balanced crosssections were carried out, and the results indicate: （1） Besides basement involvement structures in the part segment of No. 1 fault, the faults were dominated by detachment faults which formed in Middle-Lower Cambrian salt layers. （2） The deformation styles were different in the upon and underneath salt layers, and the distortion was stronger in the upon salt layer than that in the underneath salt layer. （3） The stratified deformation was coordinated by salt layers. （4） The stratified deformation was controlled by both subduction orogeny and decollement of salt layers.

Key words: decollement structure, stratified deformation, salt layers, Tazhong lower uplift