Thermal Regime and Paleogeothermal Gradient Evolution of Mesozoic-Cenozoic Sedimentary Basins in the Tibetan Plateau, China
详细信息
- 责任者：Chen Honghan (Institute of Geology & Geophysics Research ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Wu You
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(3)
- 关键词：地温梯度 ; geothermal gradient ; 热演化 ; thermal evolution ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.541-552
- 图表：illus., 4 tables, 56 refs.
- 分类号：1003
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
Although many scholars have done a lot of research on the uplift mechanism of Tibet plateau,intercontinental subduction,mid-low crust flowing and magmatic activities,the thermal regime and paleogeothermal gradient evolution in the Mesozoic-Cenozoic sedimentary basins have rarely been studied.But the thermal regime and evolution of paleogeothermal gradient have great significance for the hydrocarbon generation processes and hydrocarbon preservation of the Mesozoic marine source rocks.On the basis of achievements of the previous research on the temperature field of Tibet plateau and evolution of basin types,using the fluid inclusion homogenous temperature,the paleogeothermal gradient evolution curves of the Mesozoic marine basins in Tibet plateau are formed in this paper.And it suggests that the Mesozoic marine basins in the low paleogeothermal gradient(<3.0 ℃/100 m)when they were in the evolution process from continental margin rift basins to back-arc basins and then to foreland basins during Mesozoic to Eocene,which were beneficial for the generation of mature oil.After that these basins evolved into residual basins and the paleogeothermal gradient rising sharply(~6.5 ℃/100 m)because of continuous and periodic uplifts of the Tibet plateau during Neogene to Quaternary,which resulted in the possibility of that the oil reservoir was cracked into natural gas and secondary hydrocarbon generation of the Mesozoic marine source rocks.Therefore,the paleogeothermal gradient evolution determines the exploration potential for oil in the cooling basin and the exploration potential for gas in the heating basin.
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