Quantitative assessment of gas washing of oils in the Tazhong area of the Tarim Basin,Northwest China

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作者：
YANG ChuPengGENG AnSongLIAO ZeWenSUN YongGe ZHANG LHui State Key Laboratory of Organic GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina Graduate University of Chinese Academy of SciencesBeijing China [1 ,2 ,1 ,1 ,1 ,1 ,2 ,1 ,510640 ,2 ,100049 ]
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ScienceinChina(SeriesD:EarthSciences) | 2009年 / 52卷 / 01期
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P618.13 [石油、天然气];
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摘要：
Gas washing has been known in the Tazhong area of the Tarim Basin,but its quantitative assessment has not yet been reported.Here the influence of gas washing fractionation in the area was discussed based on the gas chromatogram data of 68 oils and the results of the mixing experiments of a black oil and a condensate.The results show that the intensity of gas washing fractionation decreased generally from northern to southern part and vertically from deep reservoirs to shallow reservoirs.The gas washing fractionation was mainly controlled by fault systems in this area,with the increase of n-alkane mass depletion positively correlated to the number and scale of faults.Gas washing fractionation appears to have affected the hydrocarbon property,and as a result the diversity of the crude oils is markedly controlled by gas washing.In addition,the occurrence of waxy oil in this area may be resulted from multiple factors including gas washing,mixed filling and migration fractionation.
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页码：12 / 21
页数：10
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