Pyrolysate Compositions of Source Beds from Major Chinese Coal-bearing Petroliferous Basins and Their Geochemical Significance
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摘要: 本文运用热解气相色谱（ＰＹ－ＧＣ）技术探讨了我国一些含煤油气盆地中煤系源岩热解产物的组成特征及意义。研究表明，不同盆地煤系源岩热解产物的差异主要表现在Ｃ+5正构烷烃＋正构烯烃含量和芳环化合物的组成上，利用热解产物Ｃ1—Ｃ5、Ｃ6—Ｃ14正构烷烃＋正构烯烃和Ｃ+15正构烷烃＋正构烯烃三个端元组分的相对含量可有效地判识煤系地层源岩有机质的产烃类型，研究表明ＰＹ－ＧＣ技术是一种值得推广的煤成烃评价方法。Abstract: In this paper, source rocks from major Chinese coal-bearing petroliferous basins were studied by Pyrolysis-Gas Chromatography (PY-GC) technique, and compositional characters of pyrolysates and their significance were discussed in detail. Differences in pyrolysate compositions of different coal-bearing source rocks are principally reflected upon the abstract amounts of C+5 n-alkanes and n-alkenes, as well as upon the constitutinn of aromatic compounds. We selected C1-C5, C6-C14 and C+15 n-alkanes and n-alkenes as three terminal represents of pyrolysate composition, and their relative amounts could be effectivelly employed to distinct types and features of hydrocarbon generation in coal-bearing source rocks.All the results show that PY-GC technique is an effective approach for coal-generated hydrocarbon evaluation, and this technique is worthy of widespread application.
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