Abstract: The micro percolation of hydrocarbon group in oil-gas pools, of which light hydrocarbons (C₁-C₅) and non-hydrocarbons (H₂S,CO₂, H₂, CO, etc.) along pore-fissure system in depositional strata towards the earth surface can result in variation of geochemical environment in the system in depositional strata on the oil-gas pools.By interaction between the percolated hydrocarbon compositions and the rock components around the pore-fissure system, the sumptomatic minerals are formed.Up to now, the sumptomatic minerals valuable in field application are pyrite, magnetite, magnetic pyrite and limonite formed by substances like H2S and bivalent iron in deposits.According to their distribution in upper part of reservoirs, the sumptomatic minerals can be applied for petroleum exploration.Hence, the method of sumptomatic minerals can be used for forecasting oil/gas-bearing reservoir underlying the stratum not drilled in well, and for re evaluating the oil/gas-bearing conditions of old wells with low-resistivity pay zones.

Key words: petroleum exploration, hydrocarbon, sumptomatic mineral, distribution, feature