The effect of tectonization in different periods on the accumulation and dissipation of hydrocarbons in different reservoirs varies in different accumulation periods.The accumulation mechanism and distribution pattern of hydrocarbons also vary in different reservoirs in different accumulation periods.For the early primary Ordovician reservoirs formed in the second accumulation period

hydrocarbons were prone to accumulate in superimposed area of relatively weak tectonization with an average erosion rate of 2.5-3.5m/50Ma due to alternate differential subsidence and great erosion rate.For the late primary Carboniferous reservoirs formed in the third accumulation period

hydrocarbons were prone to accumulate in low uplift and slope zones with an average erosion rate of 1.0-2.5m/50Ma

rather than in structural high

due to multiple tectonization and erosion resulted from the successive paleohigh in the basin For the late primary Carboniferous reservoirs formed in the fourth accumulation period

some hydrocarbons accumulated in the structural high because of the existence of favorable migration pathways

such as the Donghe sandstone and unconformities

and some accumulated in the peripheral area of the depression without long migration because of late expulsion and lack of favorable migration pathways.