There is great volume oil-gas which possesses abnormal chemical properties and complicated distribution regularity in rift basins where ever existed strong magmatic activities. In order to study distribution regularity of the oil-gas, we analyzed the intrusion and its neighboring hydrocarbon reservoir in the middle-eastern Zhanhua sag by means of cores observation and geochemical analysis,and found that the magma high temperature, high pressure and active chemical properties not only promoted notably the hydrocarbon generation in source rocks, but also caused a lot of cracks and organic pores. Border facies of the intrusion is good reservoir owing to well-developed gas pores, dissolution pores and contraction cracks. The overpressure field caused by the magmatic activities greatly improved the source rocks’adsorption capability on hydrocarbon. Furthermore, the magmatic activities can form many sorts of traps. The magmatic activities can not only promote oil and gas generation, but also control the oil and gas distribution. In the end, we indicate that the controlling of magma on hydrocarbon is dependent on magma activities time, strength, mode, and spatial relationship between magmatite and source rocks and so on.