Abstract: To get systematic research and deep understanding of the source rock in the Teng 2 block, Baiyinkundi sag, Erlian Basin, using cores, cuttings, and geochemical technology, the geochemical parameters of the source rocks were tested and analyzed, including the abundance, type and maturity of the organic matter. The research result shows that the source rock in the Teng 2 block are mainly distributed in the Shahai Formation and Jiufotang Formation; the cumulative thickness is above 700m; the organic matter abundance is generally in the medium-good level; the type of the organic matter is Ⅱ_a-Ⅱ_b; the thermal evolution has entered the oil generating window; the maturity of the organic matter in the lower source rock is higher than that in the upper source rock. Moreover, the oil generating potential of the Jiufotang Formation is much better than that of the Shahai Formation; the average original hydrocarbon generation potential is 13.26 mg/g; the average hydrocarbon expulsion potential is up to 7.68 mg/g; and the average oil-to-gas conversion coefficient gradually increases with the depth of burial.

Key words: Baiyinkundi sag, characteristics of source rock, abundance of organic matter, type of organic matter, characteristics of hydrocarbon generation and expulsion