Taking into account the generation and expulsion hydrocarbon history of sourcerocks, the seal formation history of caprock, the formation history of traps, the active history of faults and the supplying history of oil or gas, we consider the main formation period to be from the end of K_1y to the early of K_2q. According to the types of oil or gas reservoirs, formation conditions of oil or gas and their matching relations in space and time and formation periods and process of oil or gas reservoirs, this pap...