Even-carbon predominance of Monomethyl branched alkanes in Humic coal from Junggar Basin, NW China

• 作者: Qingsong Cheng Min Zhang Guanghui Huang
• 来源期刊: 地球化学学报(英文）
• 关键词: Junggar basin Humic coal Even carbon predominance 2-methyl alkanes 3-methyl alkanes
• 年，卷（期）: 2020,（3）
• 页码范围: 434-444
• 页数: 10页
• 语种: 英文
• DOI: 10.1007/s11631-019-00372-8

摘要

A series of Monomethyl branched alkanes compounds were detected between nC14-nC36, in immature and low maturity Jurassic humic coal, Junggar basin. 2-methyl alkanes and 3-methyl alkanes accounted for the vast majority of the compounds. It is worth noting that the 2-methyl alkanes in the humic coal samples show an obvious distribution of even carbon predominances rarely reported in the literature. The results show that with the increase of Pr/Ph (pristane/phytane), the even carbon dominance of 2-methyl alkanes is more obvious, while the odd carbon number distribution of 3-methyl alkanes is weakened. As Pr/Ph increases in the humic coal, the relative content of the hopanes increased, while the relative content of 2-methyl alkanes and 3-methyl alkanes increases first and then decreases.