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利用ＧＣ／ＭＳ技术在吐哈盆地侏罗系煤及泥岩中检出了多系列高位单甲基取代烷烃及新的长链高位二甲基取代烷烃系列化合物。高位单甲基取代支链烷烃碳数分布范围很宽，尤其以ｉＣ１８—ｉＣ２５为最丰富，其中８－至１３－甲基系列（混合物）占优势。此类化合物主要来源于菌藻类生物质，还原性环境有利于菌藻的聚集及保存。褐煤中检出的长链高位二甲基取代烷烃化合物系列为１１，１４－二甲基系列，均为偶碳数烷烃，碳数范围为Ｃ２６—Ｃ３６。此类化合物为国内外首次报道，其生源可能为某（些）特殊的菌藻类。高位单甲基及二甲基取代异构烷烃在煤系沉积有机质中的高丰度分布，表明某些成煤沼泽环境可以繁殖菌藻类，并且其生物质可得到保存，而成为煤系成烃有机质的组成部分
In the Jurassic coal and mudstone of the Turpan-Hami basin, a series of high monomethyl substituted alkanes and new long chain high dimethyl substituted alkanes were detected by GC / MS. The higher monomethyl substituted branched alkanes have a wide range of carbon number distributions, with iC18-iC25 being the most abundant, with the 8- to 13-methyl series (mixture) predominating. Such compounds mainly come from bacteria and algae biomass, reducing environment conducive to the accumulation and preservation of bacteria and algae. The long chain high dimethyl substituted alkane compounds detected in lignite are 11,14-dimethyl series, all of which are even carbon alkanes, with carbon numbers in the range of C26-C36. Such compounds are the first reported at home and abroad, their students may be some (special) bacteria and algae. The high abundance distribution of high monomethyl and dimethyl-substituted isoparaffins in coal-bearing sedimentary organic matter suggests that some marsh environments can propagate bacteria and algae, and their biomass can be preserved to form coal-based hydrocarbons Component of organic matter