- 责任者：Jiao Yaxian (State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Qiu Nansheng
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(9)
- 关键词：地热学 ; geothermics ; 岩石圈 ; lithosphere ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.3051-3060
- 图表：illus., 46 refs.
- 分类号：0400
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
The thermal history of sedimentary basins can provide continuous information on time and space for the geodynamic process at depths.The heat flow evolution histories of 7wells in the Ordos basin were modeled by using the vitrinite reflectance in this paper.Based on these modeling results,thermal lithospheric thicknesses in the late Mesozoic,the early Paleogene and the present were calculated.The Ordos basin had gone through a heat flow peak in the late Early Cretaceous,when the heat flow reached up to 73～78 mW/m2.After the late Early Cretaceous,the heat flow value gradually reduced to the present 61.8 mW/m2.At the same time,the Ordos basin experienced a thinning process in the late Early Cretaceous,when the average thermal lithospheric thickness was about 65km.Since then the thickness had increased to the present 125 km.The thermal lithospheric thickness at present is in the mid-level and there doesn＇t exist a ＂lithosphere root＂ of 200 km thick.The early Cretaceous was an important geological period of transformation for the Ordos basin,when active tectonic activities at depth led to the strong denudation in the shallow,the intense tectonic-magmatic activities on the periphery of the basin and the generation of many energy resources.The time of heat flow peak in the Ordos basin is consistent with the time when the tectonic system of the eastern North China Craton began to change and the North China Craton destructed.