Abstract: Based on the comprehensive analysis of assemblage characteristics and the relationship of the reservoir-forming
elements configuration，the accumulation model was formed according to the characteristics of the fault basin and the main controlling
factors of the hydrocarbon reservoir formation，and the influence of seismic pump to the hydrocarbon vertical migration
is also studied. The main kinds of reservoirs here are structural gas reservoirs，lithologic structural gas reservoirs，stratigraphical
on-lap hydrocarbon reservoirs，bedrock weathered crust type oil-gas reservoirs and structural-lithologic gas reservoirs. The
seismic pump extracted the natural gas below the second member of Denglouku Formation up to the top of itself. The positive
inversion structures which were formed by the two-stage tectonic movements provided structural traps and the vertical channels
to divert for the oil and gas. There are three hydrocarbon generation peaks in Shahezi Formation. Because of the intensive
structural activities，the reservoirs were destroyed at the first time；but at the second and third time，with the cooperation of
other elements，the reservoirs were formed.

Key words: hydrocarbon accumulation, oil-gas migration, seismic pump, positive inversion structures, hydrocarbon accumulationperiod, Xujiaweizi Depression