Study On The Tectonic Characteristics Of The Bozi-Dabei Section Of The Kucha Depression Kelasu Tectonic Belt

The Kelasu Tectonic Zone is the main gas producing area in the Kucha Depression.During the increasing of oil and gas exploration,it faces the problem of insufficient drillable target traps.The Kelasu tectonic zone is mainly composed of tectonic traps,which are divided into Awat section,Bozi section,Dabei section and Keshen section from west to east,Bozi section and Dabei section still have trap gaps,and the fracture spreading characteristics and tectonic pattern of this section have multiple solutions,so this area is an important area for finding new target traps.This paper takes Bozi-Dabei area as the target to study its tectonic style and fracture spreading characteristics.We use the latest 3D seismic data to calibrate,carry out profile and planar fine interpretation of stratigraphy and fractures,and analyze the tectonic deformation in this zone under unbalanced extrusion conditions.The study concluded that the rigid stratum of the target Cretaceous Bashijiqike Formation is sandwiched between two sets of plastic strata and undergoes precessional deformation when it is unbalancedly pushed and extruded,and maintains self-similar deformation with a stable angle of wedge,which limits the scope of tectonic deformation due to the blocking effect of ancient uplift and complicates the tectonic style.The concept of tectonic transition zone and the critical wedge theory are introduced to establish the "two-story" tectonic style in the Bozi-Dabei area;finally,the tectonic development pattern and planar spreading characteristics of the study area are clarified.Through the establishment of the new tectonic style,the trap gap area in the Bozi-Dabei area is liberated,and new drillable targets are searched for to provide a reserve trap for oil and gas exploration.