Kinematic Characteristics And Genesis Analysis Of Segmental Deformation In Tazhong No.1 Structural Belt

Tazhong No.1 structural belt shows segmentation along strike which reflected directly by differentiation change in tectonic deformation patterns and activity intensity of it,but the kinematic characteristics and genesis of segmental deformation are still not clear,which need to be studied deeply.In this paper,based on the two-dimensional and three-dimensional seismic data,the geometric and kinematic characteristics of the Tazhong No.1 structural belt are studied through fine structural analysis,statistics of kinematic parameters and determination of active stages.Besides that,the segmentation model is established and segmental controlling factors are also discussed.The research shows that: Tazhong No.1 structural belt can be divided into three segments with Well Zhonggu15 and Well Zhonggu21 being boundary.From west to east,the tectonic patterns show as fault propagation fold-basement involved fault,tectonic slope break-strike-slip fault and chevron fold-strong thrust fault respectively.Statistics of fault throw,elevation difference of the key interfaces and tectonic zone width show that activity intensity of three segments is larger in the east,followed by the west and smaller in the middle.From west to east,the activity characteristics of three segments are classified as single thrust-nappe segment,the compression and strike-slip segment and the intense thrust segment,respectively.The middle Caledonian Episode I is the main active period of Tazhong No.1 structural belt,and activity of the west Kunlun orogenic belt led strong thrust in the west and east segments.The activity of Altyn orogenic belt during the middle Caledonian Episode ? led the eastern segment strongly compressed and the middle segment undergo strike-slip activity.The multistage activities of the two orogenic belts provided the development background for the segmental deformation of the Tazhong No.1 structural belt.The basement structure and pre-existing faults play as the main controlling factors for the segmentation.The NE-trending strike-slip faults adjust thrust activity of the structural belt,and play as associated faults.Activity of the Tazhong No.1 structural belt effected geomorphology characteristic,karstification and structure of fracture zone,which deeply controlled reservoir sediment environment and improvement of reservoir property.