下扬子地区古生界硅岩地球化学特征及成因

doi:10.3969/j.issn.1673-8926.2015.05.037

LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 232-239.doi: 10.3969/j.issn.1673-8926.2015.05.037

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Geochemical characteristics and origin of Palaeozoic siliceous rocks in Lower Yangtze area

Li Hongjing¹， Lin Zhengliang¹， Xie Xinong²

1. Sinopec Geophysical Research Institute ， Nanjing 211103 ， China ； 2. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education ， China University of Geosciences ， Wuhan 430074 ， China

Online:2015-09-26 Published:2015-09-26

Abstract

Abstract:

As regional source rocks, the Lower Cambrian, Middle Permian and Upper Permian in Lower Yangtze area developed bedded siliceous rocks. The analysis of geochemical characteristics and origin of the Palaeozoic siliceous rocks in Lower Yangtze area is very important for understanding sedimentary setting of source rocks. Based on the analysis of major elements and rare earth elements of the siliceous rocks from the four typical sections （Lower Cambrian Qingkeng section in Qingyang town, Pingdingshan section in Chaohu Lake, Majiashan section in Chaohu Lake and Changqiao section in Jing county） in Lower Yangtze Wuwei-Nanling area, the SiO₂content of the Lower Cambrian is a little higher than that of the Permian; the siliceous rocks of Lower Cambrian Huangpailing Formation, Middle Permian Gufeng Formation and Upper Permian Dalong Formation have weak negative Ce anomalies, but they have different Eu anomalies. Based on the MnO/TiO₂ratio of Paleozoic siliceous rock, the relation of Fe₂O₃/TiO₂-Al₂O₃/（Al₂O₃+Fe₂O₃） and the rare earth element characteristics in the study area, it is concluded that the sedimentary setting of the siliceous rocks of Upper Permian Dalong Formation is neritic shelf facies. While the bedded siliceous rock of the Lower Cambrian and Middle Permian Gufeng Formation deposited on the marine basin, of which the depositional environment is more closely to the inner of basin compared to the siliceous rocks of Dalong Formation. According to Al/（Al+Fe+Mn） ratio of the bedded siliceous rocks of three layers, the triangular plots of Al-Fe-Mn and rare earth element characteristics, it is considered that the Lower Cambrian siliceous rock is hydrothermal genesis, the Upper Permian siliceous rock is typically biogenic genesis, and the siliceous rock of Middle Permian Gufeng Formation is biological and hydrothermal mixed genesis.

Key words: oil sands, oil content, synthetic oil-bearing index, logging evaluation, Qaidam Basin

Li Hongjing， Lin Zhengliang， Xie Xinong. Geochemical characteristics and origin of Palaeozoic siliceous rocks in Lower Yangtze area[J].LITHOLOGIC RESERVOIRS, 2015, 27(5): 232-239.

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