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| Analysis of high-resolution sequence stratigraphy and coal accumulation law of upper Paleozoic erathem in Ordos Basin |
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LI Zeng-xue1,2,HAN Mei-lian1,WEI Jiu-chuan1,YU Ji-feng1,2,LI Jiang-tao3,LU Da-wei1
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(1. College of Geosciences and Engineering, Shandong University of Science and Technology, Qingdao 266510,Shandong Province，China ;2. Research Center of Petroleum and Gas Exploration and Exploitation Techniques of Shandong,Qingdao 266510, Shandong Province^China;3. Guangzhou Institute of Geochemistry in Chinese Academy of Sciences, Guangzhou 510640 f China)
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| Abstract: |
| The sequence strati graphic theory and method, in particular, the base-level method of high-resolution sequence stratigraphy were used in the study of infilling series of Late Paleozoic erathem in Ordos Basin. The high-resolution sequence strati-graphic units were classified to figure out the coal accumulation law within the basin. The results indicate that upper Paleozoic erathem are composed of three parts: the epicontinental sea basin infilling, infilling during basin transform and the infilling series of large depression basin within plate. The series from lower Benxi formation to upper Shihezi formation was classified into four 2nd-order and nine 3rd-order sequences. The coal accumulation law and the migration of coal-rich components were analyzed within the high-resolution sequence strati graphic framework. The results suggest that coal accumulation can migrate with the basin being filled and evolving, and that the coal accumulation was the strongest one at the period when coal seam 5 was deposited and shrunk when coal seam 3 was deposited. The variation in coal accumulation strength and the migration of coal-rich unit are subject to the development and abandon of the sedimentary system during the infilling of the basin. |
| Key words: Ordos Basin Paleozoic erathem high-resolution sequence stratigraphy base-level cycle coal accumulation law |
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