Being relative to the types of the argillaceous rock，carbonatite has special oil and gas source conditions，such as good sedimentary environment rich and high organic sources，abundance indexes of the organic matter of it; organic carbon content (TOC) and chloroform bitumen "A”con-tent are relatively lower. And because the carbonatite does not contain or contains a spot of clay mate-rial, so the catalysis of clay material down't work for lots of hydrocarbon generation thus only car-bonatite is buried deeply enough to moderate temperature to generate hydrocarbon. The oil source po-tentiality was discussed from the oil generating condition including sedimentary environment, sourceand type of organic material, evaluating index and prompting function of organic hydrocarbon genera-tron.