Abstract:

Based on the interpretation of seismic data，the residual thickness of sediment strata，contact relationship between overlying and underlying strata，interfaces in the hanging wall and footwall blocks，and development characteristics and variational rules of unconformitv in Kalashayi fault in Bachu uplift of Tarim Basin were researched，moreover the characteristics of activities of Kalashayi fault in different stages were investigated.  The results show that the east section and the west section of Kalashayi fault have different activities. In the east section，the fault is inactive from Late Cambrian to Ordovician，and thrusting nappe fault occurs from the late stage of Early Silurian to Early Permian；in Middle Permian the fault is inactive and thrusts again in Late Permian.  The subsidiary faults located in the south of main fault are inactive from Late Cambrian to Earlv-Middle Silurian，then strongly thrust since Early Devonian and continue to thrust until Early Permian；after a quiet period within Middle Permian，the faults are weakly active in Late Permian. In the west section，the fault is inactive since Late Cambrian；in  Ordovician，the fault is active to be an extensional fault；from Silurian to Middle Permian，there occurs a quiet stage；in Late Permian，the fault has undergone a positive inversion movement.  The subsidiary faults in the west section are inactive from Late Cambrian to Middle Permian and are strongly active to be thrusting nappe faults since Late Permian.

Key words: Kalashayi fault, truncation, positive inversion structure, active stake