Geochemical Characteristics and Oil-source Correlation of the Jurassic Source Rocks in the Erlian Basin

Although the exploration of the Jurassic source rock in the Erlian Basin is limited,industrial oil sources were discovered in this layer recently.This paper studied the oil source correlation in the Jurassic Formation through carrying organic petrology and geochemical analyses and studying the biomarker characteristics of crude oils and source rocks.The results indicated that the lower and the middle Jurassic source rocks have higher content of organic matters,higher maturity and better potential of hydrocarbon producing than those of the Upper Jurassic source rocks,which were deposited in oxidation lacustrine environment and dominated by terrestrial higher plants input.In addition,the crude oils in the Jurassic Formation from the Well A56and the Well Tucan 1are originated from the Jurassic source rocks.In summary,the Jurassic Formation source rocks have well exploration prospect.