The microstructure has been analyzed to the armor steel with attacks,it was discovered that the destruction of armored steel under the impact load is first produces the crack source in the crystal boundary intersection point,then connects mutually.

The CO 2 gas generation,migration and accumulation and reservoir trapping,capping and preservation are strictly controlled by the gas source fault system.

Influence and evaluation of fracture through source rocks on the oil and gas reservoir-forming in west slope region;

The mechanical condition and microcharacteristics of the cleavagecrack origin of a HSLA steel are studied based on the finiteelement method(FEM)and microfractography by a scanningelectron microscope(SEM).