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College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China. 
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Corresponding Author: Dian Wang (Email: dianwang@jlu.edu.cn) 
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...P% latex2html id marker 1706 \setcounter{footnote}{2}\fnsymbol{footnote}
Qian An Oil Factory, Jilin Oilfield, CNPC, Songyuan 138000, China. 
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