Abstract: The hydrochemical study shows that the multi-directional hydrochemical sections developed in research zone of Luliang area can be divided into three hydrogeological cycles. The first one (C-T) is a deep, static and opened lag-style hydrodynamic system; the second one(J_1b-J_2x) is a mid-depth, weakly opened compacting drive hydrodynamic system; the third one (J_2t-K) 1belongs to shallow, strongly opened gravity drive hydrodynamic one. In the middle Jurassic, the salinity of water is relatively low, appearing higher-low-high hydrochemical section,which shows the most intensive zone by hydrodynamic process might develop in the unconformity between Triassic and Badaowan formation of Jurassic;the CaCl₂, water type occurs in deep and shallow formations with multi-layer petroleum bearing shows, revealing that they could be favorable areas for petroleum accumulation, and the faults are good channels for oil-gas migration channels.

Key words: Junggar basin, Luliang area, hydrodynamic condition, petroleum migration, petroleum accumulation