HYDROCARBON VERTICAL MICRO-MIGRATION AND ITS GEOCHEMICAL EFFECTS IN SICHUAN BASIN
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摘要: 根据钻井垂向剖面中烃类的变化特征,研究其烃类垂向微运移迹象,用以追溯地表异常来源,进而研究近地表异常模式及成因机理。四川盆地油气井中自深至浅,环烷烃百分组成逐渐降低,正构和异构烷烃不断增加;280 nm和210 nm紫外导数值逐渐降低;运移指向明显,表征了烃类垂向微运移客观存在的事实。川西地区近地表样品与下伏储层C1—C5色谱图及三维荧光图谱基本相似,说明二者同源,揭示了近地表化探异常为"有源之水",近地表化探异常及其靶区预测是可靠的。Abstract: According to the characteristics of the hydrocarbons in the well profiles,the hydrocarbon vertical micro-migrating tracks can be revealed and then proceed to trace to the source of hydrocarbon anomalies near surface.This is an important method of studying the near-surface hydrocarbon anomaly patterns and forming mechanism.In the oil and gas wells in Sichuan Basin,the percentage of naphthenic hydrocarbon gradually decreased while the normal alkane and isoalkane increased from deep to surface.Moreover,the ultraviolet derivative values of 280 nm and 210 nm decreased.These clearly indicate the direction of hydrocarbon vertical migration and show that the surface hydrocarbon anomalies have relation with deep reservoir.In a gas well in west Sichuan area,the hydrocarbon chromatogram of C1—C5 and the 3D fluorescence chromatogram of the near-surface sample are similar to that of the reservoir sample,showing the both ha-ving the same source.
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[1] 汤玉平,蒋涛,刘运黎.油气藏不同部位△C差异性分析[J].石油与天然气地质,1999,20(1):76～77. [2] 汤玉平,龚维琪,邓树立.油气化探异常类型及成因机理研究[A].见:程同锦,戴联善编.第四届全国油气化探学术会议论文集[C].武汉:中国地质大学出版社,1998.19～25. [3] 汤玉平,刘运黎.烃类垂向微运移的地球化学效应及机理讨论[J].石油实验地质,2002,24(5):431～436. [4] 蒋涛,夏响华,陈浙春.地球化学烃场效应的探讨及应用[J].石油实验地质,2003,25(3):290～294. [5] 吴传璧.上置晕与物质的"类气相"垂向迁移[J].地学前缘,1998,5(1):185～192. [6] 赵克斌,孙长青.油气化探在天然气勘探中的应用[J].石油实验地质,2004,26(6):574～579,584. [7] 刘运黎,汤玉平.川西油气田区地球化学场特征分析[J].地质通报,2003,22(4):290～294. [8] 钱志浩,曹寅.新疆塔里木盆地北部原油运移地球化学效应[J].石油实验地质,2001,23(2):186～190. [9] 贾国相.油气生成量、聚集规模与区域地球化学背景场的关系[J].石油实验地质,1998,20(2):196～199,203. [10] 刘文汇.试论成烃的地球化学场[J].石油实验地质,2000,22(1):3～8,21. [11] 黄海平,张水昌,苏爱国.油气运移聚集过程中的地球化学作用[J].石油实验地质,2001,23(3):278～284. [12] 康义昌.四川盆地的基岩结构及其与上覆层的关系[J].石油实验地质,1986,8(3):235～242. [13] 戴金星,夏新宇,卫延召等.四川盆地天然气的碳同位素特征[J].石油实验地质,2001,23(2):115～121,132. [14] 李海燕,付广,彭仕宓.天然气扩散系数的实验研究[J].石油实验地质,2001,23(1):108～112 -
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