Tectonic Evolution and Prediction of Favorable Prospecting Area after the Indosinian Stage in Lower Yangtze Region

Abstract

Abstract:

By recovery of erosion thickness of the latest Cretaceous and the latest Paleogene and the analysis of the maximum depth of Indosinian unconformity Tg0, it is suggested that the PaleozoicMesozoic hydrocarbon source rock have occurred late hydrocarbon generation and accumulation. In the latest Cretaceous, the largest erosion thicknesses of Huangqiao, Jurong and Wuwei areas are 1,000 m, 1,500 m and 800 m. In the latest Paleogene, the largest erosion thickness of Huangqiao area is about 450 m, but Jurong and Wuwei areas are not denuded. Under the paleogeothermal gradient of 3.3 ℃/100 m to 4 ℃/100 m, in the latest Cretaceous, the depths of about 70% PermianLower Triassic hydrocarbon source rocks are 2,000 m to 4,000 m and have entered the oil generation stage under the gas generation stage in Wuwei area; Almost all the PermianLower Triassic hydrocarbon source rocks have entered the oil generation stage in Jurong area,and its subsag region with depth below 4,000 m entering the gas generation stage; In Huangqiao area, about 70% PermianLower Triassic source rocks reach the oil generation stage, mainly in northern deep depression and western subdepression, and its deep parts have entered the gas generation stage. Many ancient nose uplift axises in Indosinian unconformity Tg0 since the latest Cretaceous hydrocarbon generation indicate the hydrocarbon migration paths, directions and accumulation areas, and their changes from Himalayan to the present indicate favorable prospecting areas.

Key words: Lower Yangtze region, erosion thickness, tectonic evolution, stage of hydrocarbon generation, favorable prospecting area

LI Jian-Jing, BO Ren-Hai, TIAN Yuan-Yuan. Tectonic Evolution and Prediction of Favorable Prospecting Area after the Indosinian Stage in Lower Yangtze Region[J]. Geoscience, 2012, 26(2): 326-332.

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