Apart from a few conventional wells,nearly no unconventional oil and gas exploration has been conducted in Northwestern Guizhou Province. To prove the shale gas accumulation conditions of Lower Silurian Longmaxi Fm in this area,regional survey,well drilling and experimental analysis are carried out. The regional survey shows that the Longmaxi Fm mud shale is mainly distributed in the north area of Northwestern Guizhou Province; the experimental test proves the organic geochemistry characteristics and physic...