The reservoir rock of the third member of the Shahejie Formation in Hubuzai

DongpuDepression is compacted sandstone with poor petrophysical property

but its reservoiringproperty improved a great deal due to well-developed fractures within the reservoir rock. It isconsidered that the hydraulic fracturing that was resulted from high-pressure fluid of saltinterlayers and the regmagenesis caused by uplift--unloading and stress release are importantorigin of the fractures in the area.