Restoration of the Thickness Eroded during the Late Triassic Indo-Chinese Tectonic Movement in the Jiyang Depression by Using the Paleo-Maturity-Equation

详细信息   

• 责任者：Chen Zhonghong (China University of Petroleum ; Dongying 2570612 ; China） ; Zha Ming
• 刊名：Acta Geologica Sinica
• 出版年：2008
• 卷期：82(8)
• 关键词：热成熟度 ; thermal maturity ; 印支运动 ; Indosinian Orogeny ; 剥蚀作用 ; denudation ; 济阳坳陷 ; Jiyang Depression
• 页码：p.1036-1045
• 图表：9 illus., 1 table, 56 refs.
• 分类号：0300
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

摘要

Comparative to the vitrinite reflectance (R_o) of the Cenozoic, the value of R_o from the Upper Paleozoic displays distinct anomaly. Based on the analysis and comparison of a number of R_o data, this study established maturity equations (R_o -H) of the Jiyang Depression of both the Cenozoic and the Upper Paleozoic, through which the eroded thickness of the discontinuity surface between the Mesozoic and the Paleozoic in the Jiyang Depression was restored. The result revealed that the eroded thickness of the discontinuity surface in the Dongying Sag, Zhanhua Sag and Chezhen Sag are 3.1～4.1 km, 2.0～4.1 km and 3.1～4.1 km, respectively, averaging 3.5 km. This fully suggests that the North China Plate was a unified large-scale sedimentary basin before the Indo-Chinese movement, and part of Late Paleozoic coal-bearing strata started to produce hydrocarbon by means of thermolysis.