Tectonic Evolution Of Ke-Wu Fault Belt And Its Effect On The Controlling Of The Sedimentary Development Mode

The Northwestern margin of Junggar Basin is a typical compression boundary and the Ke-Wu fault belt starts from Karamy,extending to the front area of Hala'alat mountain.From north to south the Ke-Wu fault belt is divided into three parts in turn:Urho tectonic belt,Baikouquan tectonic belt and Karamy tectonic belt,which is a large scale thrust system.Meanwhile,it is a synsedimentary thrust fault system,controlling the the deposition of the sedimentary facies.On the one hand,the study of the structure deformation characteristics and the mechanism of evolution have a significant meaning for the development of the study of structure-deposition,on the other hand,it plays an important role in exploring the oil and gas in compressional basin.Based on the seismic interpretation,the combination of faults in section and faults distribution on plane are analyzed.On the section,the combination of the faults is mainly of afterward thrust imbricated faults,ramp and normal drag structure can be seen in the local area.On the plane,the NE of Ke-Wu fault belt is narrower than the SW,appearing a shape of reversed S and cataphracted.With the structural experiment,simulating the tectonic characteristics of Hala'alat mountain and discussing the forming mechanism.At last,through the research of the outcrop and core data,we determine the type and characteristics of sedimentary facies and explore the controlling effect of tectonic activities.Fracture has the controlling function on the distribution of sedimentary system.Distribution of fan in Ke-Wu area is controlled by morphology of slope,combination type of faults,faults activity and normal drag structure.