现代地质2012，Vol.26Issue(2)：326-332,7.
下扬子区印支期后构造演化与有利勘探区预测
Tectonic Evolution and Prediction of Favorable Prospecting Area after the Indosinian Stage in Lower Yangtze Region
摘要
Abstract
By recovery of erosion thickness of the latest Cretaceous and the latest Paleogene and the analysis of the maximum depth of Indosinian unconformity Tg°, 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 °C/100 m to 4 °C/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 Tg° 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.关键词
下扬子区/剥蚀厚度/构造演化/生烃期/有利勘探区Key words
Lower Yangtze region/ erosion thickness/ tectonic evolution/ stage of hydrocarbon generation/ favorable prospecting area分类
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李建青,蒲仁海,田媛媛..下扬子区印支期后构造演化与有利勘探区预测[J].现代地质,2012,26(2):326-332,7.基金项目
中国石油化工股份有限公司华东分公司勘探先导性研究项目(G1408-09-KK-0). （G1408-09-KK-0）
