In order to reconstruct the sedimentary environment and provenance of the Upper Wuerhe Formation in Well Block Jinlong30 in the Zhongguai Uplift, and study their effects for petroleum exploration, we tested and analyzed the major, trace elements and rare earth element content of 13 sedimentary rock samples from the Upper Wuerhe Formation. The results indicate that the abundance of oxides of major elements are close to PAAS and UCC, while the trace elements are both less than PAAS and UCC. The total ∑REE of the study area have a scope of content and are characterized by striking enrichment of light REE, and show slight negative anomalies of Eu. Before using these element data, we removed some effects from diagenesis and used several parameters for every task to ensure the accuracy of the conclusions. Eigen values of Sr/Cu and ∑LREE/∑HREE show that the paleoclimate of the upper Wuerhe Formation was warm and moist with abundant rainfall. Eigen value Mg/Ca and Sr/Ba show that the ancient aquatic environment was brackish, as well as the redoxsensitive elements U and Th in the authigenic minerals show the oxidizing condition of the ancient water. Under these circumstances, the upper Wuerhe Formation shows a finingupwards sequence, grainsize gets finer from the old to new formations as the ancient water become progressively deeper. The depositional environment changes from subaqueous distributary channel of fan delta- front to shallow lake, producing many fine reservoirs that become large oil and gas reservoirs. Based on La/ThHf plot and the REE characteristics, it can be concluded that provenance of studied area mainly derived from felsicpredominant rocks and some basic rocks. La/ScTi/Zr plot and parameters of REE show that the structural setting of the studied area is land arc related to a continent, and the sediments are magmatic arc. The active tectonic movement of the continental island arc prompted the study area to form a “two convex and one concave” landform, which provided a space for sediment deposition and was the basis of formation of the fan delta sedimentary environment. The late volcanic activity was stopped by the Upper Urho Formation. The premise of the formation of clastic sediments.