The fluid inclusions in the fracture filling minerals in the Lower Triassic

Xiejiawan Trap

Dangyang synclinorium

can be classfied into 5 kinds and 4 types of association.In each association type

the homogenization temperatures of the inclusions varied from low to high

then to low and finally to lower temperature again

suggesting the bury depth of the 5th Member of the Jialingjiang Formation changed from shallow

→

deep

→

shallow

→

shallower again.According to the analysis of inclusion composition

the migration of liquid hydrocarbons of the study area should happen before Early Yenshan Period

but the migration of gaseous hydrocarbons started in Late Yenshan-Himalayan Period.