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本文根据鄂尔多斯盆地腹部一深井中有机质的垂向成烃演化及碎屑岩层段（０～３６５０ｍ）酸解烃组成的变化特征，讨论了油气微渗漏的色层分馏效应．结果表明在两个贫有机质层段（０～１０２０ｍ．３０８０～３５６０ｍ井段）内砂岩段相对于相邻泥岩段酸解烃的Ｃ１／Ｃ２＋、Ｃ１／Ｃ总及ｉＣ４／ｎＣ４比值偏小，这主要是由甲烷相对重烃，异构丁烷相对正构丁烷易于通过弱渗透的泥岩遮挡层产生的色层分馆作用所造成。而富有机质层段（１０２０～３０８０ｍ井段）酸解烃组成的变化主要由有机质成烃作用控制，运移的色层分馏效应被成烃所掩盖。
In this paper, according to the vertical hydrocarbon generation and evolution of organic matter in a deep well in the Ordos Basin and the characteristics of acid-leaching hydrocarbon composition in the clastic interval (0 ~ 3650m), the chromatographic fractionation effect of micro-leakage of oil and gas is discussed. The results show that the ratios of C1 / C2 +, C1 / C and iC4 / nC4 in the sandstone section of two poor organic layers (0-1020m.3080-3560m section) are smaller than that of the adjacent mudstone section Mainly due to methane relative heavy hydrocarbons, isobutane isobutane relatively easy to pass through the weak mudstone shale barrier layer caused by the role of the color library. However, the change of acid-hydrolyzed hydrocarbon composition in the organic-rich interval (interval 1020 ~ 3080m) is mainly controlled by the hydrocarbon formation of organic matter, and the migration of the chromatographic fractionation effect is obscured by hydrocarbons.