Abstract: There exist two types of organic inclusions in the quartzose grain cracks of oil sandstone reservoir in Lukeqin structural belt, Turpan-Hami basin. The first type is one with pure liquid hydrocarbons, which is different in size, brown in color, yellow in fluorescence, 86~118 C in temperature, and cannot tell from gas or liquid state; the second one is dominated by gas state which accounts for 10%~30%, with light yellow in color, brown in fluorescence, 113~157 C in temperature, showing gas and liquid states. Two-period hydrocarbon inflow can be reflected from the inclusions. The first period took place in early Y anshan movement, with relatively low maturity; the second one in middle Yanshan movement, with relatively high maturity of crude oil. All of the hydrocarbon came from the Upper Permian in Taibei sag, characterized by oil phase and mixed oil-water phase, and migrated from northwest to southeast and then accumulated into reservoirs. During the migration, densification of crude oil occurred in some degree, due to low maturity of hydrocarbons generation in source rocks and continuous uplifting for the structural belt during the period of Middle Late Jurassic.

Key words: Turpan basin, Hami basin, (Lukeqin Structural belt), Organic matter, Inclusion, 0il and gas migration, Oil and gas accumulation, Source bed