The Shigang

Chajian and Wubao fault systems in Subei basin represent

laterally

combined characteristics of a major fault with main linear shift zone

horsetail splays and en echelon lambda-type structures

and

vertically

structural features of cone-like fracture

forced monocline and fractured main shift zone. Shear and compressive fracture planes can be observed in rocks beside the faults. Based on the above characteristics

it is believed that the Shigang

Chajian and Wubao fault systems are of discrete-type right lateral strike-slip faults. Stress analysis indicates that Subei basin has experienced both agents of extension and right lateral strike-slip

while right lateral wrench movement is the main cause of strike-slip faults

which has been controlled by Tanlu fracture zone. It is the features of discrete-type right lateral strike-slip of the Shigang

Chajian and Wubao fault systems that control the formation and distribution of oil and gas traps

as well as the migration and accumulation of oil and gas in Subei basin.