Abstract: In 1763, Russian scientist Lomennosov proposed the "dualism" hypothesis of "organic origin" and "inorganic origin" for crude oil and natural gas. Nowadays, the scientific and technological development has come into new era of multidisciplinay intercrossing or interpenetration. By means of idea of "One or the other" for cognition of objective things in generation and development, it is obviously inadequate or inadaptable. China is one of the earliest countries discovering and utilizing crude oil and natural gas in the world. The sustained development in China's oil and gas resources needs new petroleum geologic theory suitable for Chinese geologic characteristics. In view of life genesis, "life matter" is also originated from "the pitch synthesized by inorganic substance". The petroleum hypothesis of organic or inorganic origins expounds the substance evolution and process in different stages. According to analysis of Chinese geologic characteristics, there should be multiple genetic mechanisms and/or models for hydrocarbon generation. The peculiar style of oil-gas bearing basins in China belongs to active volcanic events, from which the multiple mechanisms for hydrocarbon generation appear in form of several models such as organic hydrocarbon-generating model and catalyzing hydrocarbon-generating model; inorganic hydrocarbongenerating mechanism as well as regenerative synthesis mechanism for hydrocarbon generation that are all contributed by the volcanic events.

Key words: life genesis, volcanic event, petroleum organic origin, petroleum inorganic origin, petroleum multifactor origin