///This paper analyzes characteristics of poly-cyclic dual structural superimposition of the sedimentary oil-gas basins in China and puts forth the oil-gas genetic dualism by which the oil and gas could be formed from both the sedimentary organic materials and the deeply derived inorganic materials then is given evidences for the hydrocarbon formation in 8 aspects. The oil-gas genetic dualism would enlarge the limits for oil-gas reservoir and the metal ore beryllium, zirconium, niobium, silver, cadmium, tin, indium, antimony, tellurium, hafnium, molybdenum, tungsten, rhenium, gold, thallium, thorium, bismuth) searching limits to more depth of the earth thus it is significant to establish oil-gas-metal-non-metal mineral resources-forming series and create economic benefits by comprehensive utilization of the helium and metal resources from the oil-gas.