Abstract: Ma Zong-jin, an academician of Academia Sinica, divided the most active tectonics in the world into circum-Pacific, ocean ridge and north continental three first-order tectonic systems according to global seismic distribution. It is shown by scanning the distribution of global oil and gas fields that they are closely related to the three most active first-order tectonic areas in the world and are distributed near the Phanerozoic volcanic rock belts. The oil and gas fields in the Bohaiwan Basin of China are distributed accompanying the Cenozoic volcanic rock bodies, and the gas fields in the Sacramento Basin of America are faulted superimposed and superpositioned with modern craters. These phenomena show that petroleum and natural gas are closely related to the supply of the Earth's deep seated matter. Spontaneous earthquakes bring about volcanic activities, underground water and natural gas discharge for supracrust. The magma of volcanic activities causes the organic matter "kitchen body" hydrocarbon-generating model for volcanic rock-covered areas, and brings about inorganic matter-ganetic hydrocarbon. Underground water causes the catalytic hydrocarbon-generating model for organic matter, and discharged H₂ and CO₂ cause the synthetic hydrocarbon-generating model. Crust active areas have many kinds of hydrocarbon-generating mechanism and models. Volcanic activities in crust active areas bring about reservoir cover trap assemblages formed by sediments and magma for sedimentary basins, and constitute hydrocarbon-generating systems of "water-fire" binary structure. Volcanic activities bring about many kinds of hydrocarbon supply caused by many kinds of hydrocarbon-generating models and binary structural reservoir-cover-trap assemblages formed by sedimentary and volcanic rocks for volcanic rock-covered areas. This is advantageous to the formation of oil and gas fields. Thus, the volcanic rock-covered areas in the southeastern coastal waters of China should be prospecting areas for petroleum.