| Did marine transgression happen in Late Cretaceous period in the southeast of Songliao Basin ？——Discussion from evidence of water chemistry |
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| 作者姓名： | Xiaoyu ZHANG Jianmei CHENG |
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| 作者单位： | Department of Hydrogeology ＆ Water Resources, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China |
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| 摘 要： | Cretaceous sediment is considered to be the important oil reservoir in the Songliao Basin, which is dominated by continental fluvial and lacustrine strata. In the past decades, research on whether the marine transgression happened in the Late Cretaceous period in the southeast of the Songliao Basin is always a hotspot in China. Previous studies analyzed the marine biology and geochemistry of sediments to argue if the marine transgression had occurred. However, the geochemistry of formation water which could indicate the paleo-environment has not attracted attention. In this paper, the geochemical variations of formation water between the Chaoyanggou anticline, Changchun anticline and Binxian depression in the southeast of the Songliao Basin are analyzed, then the results by comparisons with chemical properties of sea water indicated： （1） the extensive range of pH values from 6 to 10 concerning the formation water. The ranges of TDS of the formation water are from 1 g/L to 20 g/L, which is less than the value in the seatwater; （2） the level of the element Br, which is an important trace element to indicate the marine sedimentary environment, is lower than that from the sea water. The concentrations of the trace element B fluctuate intensively, probably due to the enhancement of water-rock interaction and the enrichment of organic matter; and （3） ionic ratio of Na/Cl and Br＊ 1000/Cl in the formation water are higher than the value of 0.8575 and lower than 1.5363 in the sea water, respectively, which might be attributed to halite dissolution.
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| 关 键 词： | 地球化学 松辽平原 微量元素 白垩纪 石油 |
Organic geochemical record of paleocivilization at the Yuchisi Site, Mengcheng, Anhui, China |
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| Xiaoyu ZHANG Jianmei CHENG.Organic geochemical record of paleocivilization at the Yuchisi Site, Mengcheng, Anhui, China[J].Chinese Journal of Geochemistry,2006,25(B08):16-16. |
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| Abstract: | |
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| Keywords: | geochemistry formation water Songliao Basin marine transgression trace element |
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