Abstract: The core samples, lab analysis and formation testing and well production data are used to analyze the reason why oil and water occur in the same zone of Triassic oil layer-I in Jinan area. The insufficient oil and gas sources found in the Triassic system are discussed in terms of petroleum accumulation feature, spatial distribution and degree of filling in oil-gas reservoirs. The results indicate that whether layer-I oil accumulation or layer-II gas accumulation of Triassic, both are lacking in enough oil and gas sources. Some advices on further exploration are also given in this paper.

Key words: Tarim basin, Jinan area, Triassic, oil-gas reservoir, oil-gas source