Abstract: Zhenyuan - Jingchuan area is near the sedimentary center of the Triassic lake basin in Ordos basin and the dark mudstone in the Yanchang Formation in the Upper Triassic is up to 250m thick This paper discusses the ge-ochemical features and exploration prospect in this area based on the previous studies and new geochemical data. It is believed that the organic matter abundance and maturity of the source rock in the Yanchang Formation in the Upper Triassic are high, and the organic matters of Ⅱ 1-Ⅲtype are the major source rock in this area. The hydrocarbon-generating strength, resource abundance and extent show that the source rock in the Yanchang Formation has the potential to form a medium sized oilfield.