Abstract:The 4th block is located in the hinterland of Junggar Basin, where there are many oil-bearing structures. It has great potential for oil and gas exploration, but its exploration degree is low. The geometry, kinematics and dynamics characteristics of the 4th block are systematically studied by using seismic and drilling data, fine structural interpretation, balanced profile and fault drop. Based on the similarity principle, the tectonic evolution process of the study area is reproduced through the structural physical simulation experiment, thus a new understanding of the dynamic origin is obtained. The result shows that the faults in the 4th block of central Junggar Basin are zonally distributed, and can be divided into three structural zones: the fault zone of Dong3-Dong1 well, the fault zone of Dong7-Dong8 well and the fault zone of Dong6 well. Among them, the faults in Dong3-Dong1 well area are high-angle thrust faults, which are strongly active during J1s-J2t sedimentary period; the faults in Dong7-Dong8 well area are high-angle normal faults and oblique slip faults, the faults in Dong6 well area are high-angle "cabbage" normal faults, and they are all strongly active during J1s-J2x sedimentary period. In the Cretaceous, the fault activity in the study area was weakened, replaced by the regional overall subsidence. In the Neogene, the structural deformation was mainly characterized by monoclinic deflection. Structural physical simulation experiments further confirmed that the faults in Dong3-Dong1 well area were controlled by the thrust of quasi-southern margin and the blocking of Baijiahai Uplift, and the faults in Dong7-Dong8 well area were controlled by the extension of the back edge of the Three Uplift’ thrusting under the strike-slip deformation mechanism.