Identification of Fatty Acid Biomarkers in Quaternary of Qaidam Basin and Their Geological Significance
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摘要: 为研究生物气气源岩中指示细菌活动的生物标志化合物参数，对柴达木盆地涩北地区第四系泥岩样品进行了脂肪酸分析，在所分析的16个样品中，三个样品中检出了较完整系列的不饱和脂肪酸和较丰富的异构脂肪酸生物标志物，以及含类异戊二烯结构的酸类，对这些脂肪酸进行了详细鉴定。根据样品中不饱和脂肪酸和异构脂肪酸的组成特征，结合地质背景，认为这些不饱和脂肪酸和异构脂肪酸以及类异戊二烯酸的主要来源可能与细菌有关，它们在生物气主要生气层段出现，进一步反映样品所处地层环境有利细菌发育，可为生物气气源岩细菌发育程度提供参考指标。Abstract: To study the biomarker parameters that indicate bacteria activities, fatty acids of three Quaternary mudstone samples from the north of the Sebei area of the Qaidam basin were analyzed by GCMS. A series of unsaturated and abundant xenobioticbranched fatty acids,and isoprenoid acid were identified and discussed in detail. Based on the constitutes of the unsaturated and the xenobiotic branched fatty acids of the two samples, and the geological background of the samples, we think that the unsaturated fatty acids, especially the xenobioticbranched fatty acids and isoprenoid acid were most probably derived from bacteria. The occurrence of these fatty acids in the main biogenic gas production layers indicates that there exist favourable conditions for bacteria upgrowth. The unsaturated and abundant xenobioticbranched fatty acids and isoprenoid acid could be used as indictors that estimate the growth of bacteria in biogenic gas source rocks.
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