240 石油与天然气地质 第21卷 上的孔隙大小近似为3.0×10cm,4000m深度上 烃类含量在纵向上呈现多个由高到低(或由低 的孔隙大小近似1×10cm。在1000m深时,胶到高)的旋回性、阶段性变化,如我国东部第三系有 数个变化台阶,其界线与生储盖组合或地质层位基 本一致塔里木盆地从第三系到石炭系烃类气体含 量有明显的旋回性变化(图7) 3结语 (1)不同地质条件下的地面和井中化探的烃类 气体、芳烃光谱特征、地下水化学成分及同位素资 料证明了烃类垂向微运移是客观存在的,为化探找 油气技术方法提供了理论依据。 2)在地质历史发展中,烃类垂向微运移不是 次完成的,具有一定的阶段性和间歇性,故化探 50 3 指标含量在纵向上呈现高一低相间的旋回性 本文编写过程中,程同锦教授级高工,汤玉平 高工提供了资料和帮助,在此一并致谢。 图7沙5井化探指标纵向变化 考文献 Fig. 7 Vertical variation of geochemical expE:ration nde in ha- eli 1刘崇禧赵克斌,油气化探发展中的若干问题[A]见:刘崇喜 态分子团很难通过页岩孔隳,2000深时沥青质 油气化探文集[C]北京:地质出版社,1995.1~4 分子不能通过页岩孔隙;而对于分子半径为1.38× 2钖汤玉平,龚维琪,邓树立,等,油气化探异常类型及成因机理研 究]油气化探,19974(2):19~24 10cm的水分子而言,即使在400m深度上,同3蒂索BP威尔特DH石油形成和分布M,郝石生,赵铁岭,陆 样能通过页岩层 婉珍,等译.北京:石油工业出版社,1986 EVID ENCE AND CHARACTERISTICS OF OIL AND GAS VERTICAL MICRO- MIGRATION Cheng Jun' Liu Congxi' Zhao Kebin' GD Xusheng? Yang Zhibin (1. Center d Geochemical Exploration, CNS PC, Hefei; 2. Department d Exploration Affairs, Shengli Petroleum Admimistration Dongying, Shandong: 3. Research Institute d Geology, Henan Petroleum Admimistration, Nanyang, Henan) Abstract Hydrocarbon vertical micro migration is a complicated geological-geochemical process. It is strictly controlled by boundary condition possesses stages in geological history. The mineralization degree of ground water shows gradient variation and ionic combination changes due to the action of ground water and hydrocarbon during the vertical micro migration. Hydrocarbon vertical micrormigration can change the ion combination, causes regular variation in component of light hydrocarbons and the flurescent intensity of aromatic hydrocarbons. That is to say, light hydrocarbons with nall mlecular weight and small radius relatively increases from reservoir to the caprocks, but the fluorescent intensit romatic hydrocarbon decreases distinctly, and the carbon isotopic value of methane of both deep seated reservoir and groud surface are basically the same. Since hydrocarbon vertical mierormigration is periodical and intermittent the geor chemical index usually in cycles from high to low or from low to high on geochemical exploration index colunm Key Words hydrocarbon geochemical exploration; vertical micro migration; evidence property o1994-2008cHinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp:/www.cnki.net上的孔隙大小近似为 310 ×10 - 7cm ,4 000 m 深度上 的孔隙大小近似 1 ×10 - 7 cm。在 1 000 m 深时 ,胶 图 7 沙 5 井化探指标纵向变化 Fig. 7 Vertical variation of geochemical exploration index in Sha - 5 Well 态分子团很难通过页岩孔隙 ,2 000 m 深时沥青质 分子不能通过页岩孔隙 ;而对于分子半径为1138 × 10 - 8 cm 的水分子而言 ,即使在 4 000 m 深度上 ,同 样能通过页岩层。 烃类含量在纵向上呈现多个由高到低(或由低 到高) 的旋回性、阶段性变化 ,如我国东部第三系有 数个变化台阶 ,其界线与生储盖组合或地质层位基 本一致 ,塔里木盆地从第三系到石炭系烃类气体含 量有明显的旋回性变化(图 7) 。 3 结语 (1) 不同地质条件下的地面和井中化探的烃类 气体、芳烃光谱特征、地下水化学成分及同位素资 料证明了烃类垂向微运移是客观存在的 ,为化探找 油气技术方法提供了理论依据。 (2) 在地质历史发展中 ,烃类垂向微运移不是 一次完成的 ,具有一定的阶段性和间歇性 ,故化探 指标含量在纵向上呈现高 →低相间的旋回性。 本文编写过程中 ,程同锦教授级高工 ,汤玉平 高工提供了资料和帮助 ,在此一并致谢。 参 考 文 献 1 刘崇禧 ,赵克斌1 油气化探发展中的若干问题[A]1 见 :刘崇喜1 油气化探文集[ C]1 北京 :地质出版社 ,199511～4 2 汤玉平 ,龚维琪 ,邓树立 ,等 1 油气化探异常类型及成因机理研 究[J ]1 油气化探 ,1997 ,4(2) :19～24 3 蒂索 BP ,威尔特 DH1 石油形成和分布[M]1 郝石生 ,赵铁岭 ,陆 婉珍 ,等译 1 北京 :石油工业出版社 ,1986 EVIDENCE AND CHARACTERISTICS OF OIL AND GAS VERTICAL MICRO2MIGRATION Cheng Jun1 Liu Congxi1 Zhao Kebin1 Guo Xusheng2 Yang Zhibin3 ( 1. Center of Geochemical Exploration , CNS PC , Hefei ; 2. Department of Exploration Affairs , Shengli Petroleum Admimistration , Dongying , Shandong ; 3. Research Institute of Geology , Henan Petroleum Admimistration , Nanyang , Henan) Abstract :Hydrocarbon vertical micro2migration is a complicated geological2geochemical process. It is strictly controlled by boundary condition ,possesses stages in geological history. The mineralization degree of ground water shows gradient variation and ionic combinatiom changes due to the action of ground water and hydrocarbon during the vertical micro2 migration. Hydrocarbon vertical micro2migration can change the ion combination ,causes regular variation in component of light hydrocarbons and the fluorescent intensity of aromatic hydrocarbons. That is to say ,light hydrocarbons with small molecular weight and small radius relatively increases from reservoir to the caprocks ,but the fluorescent intensity of aromatic hydrocarbon decreases distinctly ,and the carbon isotopic value of methane of both deep seated reservoir and groud surface are basically the same. Since hydrocarbon vertical miero2migration is periodical and intermittent ,the geo2 chemical index usually in cycles from high to low or from low to high on geochemical exploration index colunm. Key Words :hydrocarbon geochemical exploration ;vertical micro2migration ;evidence ;property 042 石 油 与 天 然 气 地 质 第 21 卷