Abstract: Tu-Ha basin belongs to a gravity flow-type basin in hydrodynamics. The main water supply comes from Bogoda mountain of northern Tu-Ha basin, characterized by the high in north and low in south for regional elevation head, the weak in east and strong in west for water level gradient. The minimum elevation head is consistant with the transported elemation of subsiding center from Cretaceous to Quaternary period, i.e., from central seg of Hongtai area in east gradually transiting to south slope of Aiding lake in west. The hydrocarbon enrichment is controlled the hydrodynamic potential field and alternating zone between formation water and surface water, with complete matching to the area of low hydrodynamic potential. Also, the petroleum reservoir formed is affected by hydrodynamic field, causing oil-gas distribution to have been modulated and re-distributed, even displaced by surface water and damaged. It is concluded that Aiding lake slope area in southwestern Turpan depression (Luxi low salient) as low hydrodynamic potential area could be favorable place for forming lithologic/stratigraphic hydrocarbon reservoirs.

Key words: Turpan basin, hydrodynamic condition, hydrocarbon migration, hydrocarbon accumulation, potential prediction