Abstract: The Selibuya fault belt is one of the boundary faults on the southern margin of Bachu uplift, in which complex fault structures formed under the influence of multi-period tectonic activities in the basin. Studying the geometrical and kinematic characteristics of the Selibuya fault belt is of great significance in exploring the nature and forming time of Bachu uplift and exploring the causes of structural deformation in the craton. Using fault-related fold theories and other seismic interpretation methods, the paper detailedly interprets and analyzes 8 2D seismic profiles nearly perpendicular to the strike of the Selibuya fault belt, redepicts the geometry of the fault belt, establishes the 3D shape of the fault belt with 3D modeling techniques, and resegment the fault belt according to fault assemblages and their distribution patterns. Combining the development characteristics of growth strata and unconformities, the paper also discusses the periods and relative intensities of the structural activities. The study suggests that the Selibuya fault belt is characterized by deep faulting whose activity is the main reason leading to the uplifting of the strata at the northern side of the fault belt. The Precambrian structure proves that the activities of the Selibuya deep faults were tensional at the early stage; according to fault assemblages and their distribution patterns, the Selibuya fault belt can be divided into the northern, middle and southern segments, all of which show stratified deformation patterns. Paleogene gypsum and the Middle Cambrian salt bed are detachment layers of Cenozoic and Paleozoic faults, respectively. The morphology of the growth strata indicate that the Cenozoic faults started their activities during the Quaternary and continued to the present. The development of the unconformity indicates that the basement faulting was active during the Middle-Late Permian with the activity intensity showing stronger in the north and weaker in the south in the fault belt. The Paleozoic active fault period occurred in the Miocene-Late Pliocene and its activity intensity showed weaker in the north and stronger in the south. The basement fault led to the overall rise of the strata, while the faults of Paleozoic and Cenozoic resulted in the strong fold deformation of the strata.

Key words: Tarim Basin, Bachu uplift, Selibuya fault belt, geometric characteristic, kinematic characteristic, growth stratum, unconformity