Abstract: Through the analogy analysis of Western Sichuan Depression and Northern America Sandstone Gas Reservoirs ，we
find that the both have similar characteristics and differences in foreland basin feature，rock tightening，abnormal pressure and
reservoir formation. Sandstone gas formation mechanism of Northern America Rocky Mountain region is simple but is complex
in Western Sichuan Depression. Under the background of multiple phases and tectonic activities，cored at the overpressure gas
source of Xujiahe Formation in upper Triassic，with the progress difference of lithology and densification in 3D space，the
change of deformation structure and fracture distribution，multiple-phase and multiple-mode adjustment of overpressure，the
distribution pattern of subsystem longitudinal overlay of many gas mineralization and multiple gas reservoir type thus formed.

Key words: west Sichuan, north America, tight Sandstone, natural gas, analogy analysis