Abstract：Hydrocarbon source rock is the material basis of oil and gas. The Cretaceous source rocks which account for 29% of all hydrocarbon source rocks occupied the top place in all series of strata. The precise distribution and characteristics of the Cretaceous source rocks in palaeoenvironment are recovered by statistical analysis and the coupling of paleomagnetism and geographic information. The results show: (1)Cretaceous source rocks were mainly deposited in the Aptian-Turonian(nearly 52 63% of the Cretaceous source rocks);(2)Two types of palaeoenvironments were favorable for source rock deposition，including epeiric sea(atypical passive margin)and rift environment; (3) The kerogen of source rocks mainly consisted of type I in the early Cretaceous. Then type II became the majority in the middle of Cretaceous. The proportion of type Ⅲ increased rapidly at the late Cretaceous;(4)The rich organic matter more likely appeared along the continent breakup edge with thriving plankton caused by the upwelling current. The high temperature and arid climate created high salinity areas in the shallow parts of epeiric sea which helped to preserve the source rocks
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