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The enrichment characteristics of deep shale gas in the Ordovician Wufeng–Silurian Longmaxi formations in the Sichuan Basin and its surrounding areas are investigated through experiments under high temperature and high pressure, including petrophysical properties analyses, triaxial stress test and isothermal adsorption of methane experiment. (1) The deep shale reservoirs drop significantly in porosity and permeability compared with shallower shale reservoirs, and contain mainly free gas. (2) With higher deviatoric stress and axial strain, the deep shale reservoirs have higher difficulty fracturing. (3) Affected by structural location and morphology, fracture characteristics, geofluid activity stages and intensity, deep shale gas reservoirs have more complicated preservation conditions. (4) To achieve the commercial development of deep shale gas reservoirs, deepening geological understanding is the basis, and …