The hydrocarbon generation mechanism of China's petroliferous basins could be divided into organic mechanism

inorganic mechanism and synthetic mechamism due to their sources.Excepting zonal hydrocarbon generation model

kitchen and catalytic models of organic hydrocarbon generation mechanism should be taken into considerable account.The kitchen model means that the eruption and intrusion of igneous magma resulted in the acceleration of maturation of organic matter in sediments.Calalytic model means that elements such as Pd

Fe

Mn

Zn

Cu etc.could improve the combination of carbon and hydrogen and produce more hydrocarbon.This calalytic model might exist in Songliao Basin

Dagang and Xinjiang Oilfields.The important indication of inorganic hydrocarbon generation mechanism is the antitone of carbon isotopic ratio in methan homologue

this has been proved in Tarim and Songliao Basins.Experiment results indicate that CO

2

and H

2

could be synthesized into methane hydrocarbon with melten iron as medium.Basalt

olivine basalt and peridotite buried in deep strata may act just as the melten iron in laboratory.Therefore

there should be the case of synthetic hydrocarbon generation mechanism in deep of the earth.