The pathways of oil and gas migration in Bachu-Maigaiti areas might consist mainly of faults

unconformity surfaces

as well as vugs

fissures and pores in reservoirs

which might have been connected with each other and constitute the delivery network of oil and gas.Among the 8 major unconformities

the T

6

0

and T

5

5

unconformity surfaces have been open in the whole area

the T

7

0

and T

5

4

unconformity surfaces have been open in the southern structural belt of Bachu uplift.Multiple tectonic movements have resulted in the opening of faults

pores

vugs and fissures

and became effective migration pathways of oil

&

gas.According to the dynamic theory of hydrocarbon migration and accumulation in late Caledonian-early Hercynian

the major pathway would be the pore-vug-fissure system in lower Cambrian dolomite that occurred in Awati sag and northeastern area of Bachu uplift; in late to last stage of Hercynian

the major pathway would include the boundary faults in the northeastern of Bachu uplift

T

6

0

unconformity surface and pore-vug-fissure system in lower Cambrian;in Himalayan period

the major pathway would be the T

6

0

T

5

5

and T

5

4

unconformity surfaces and the fault belt on the southern boundary of Bachu uplift that occurred mainly in the area including the Maigaiti slope and southern boundary of Bachu uplift.