江西乐平晚二叠世煤成烃机理红外光谱研究  

Research on Hydrocarbon-Generation Mechanism of Upper Permian Coals from Leping, Jiangxi, Based on Infrared Spectroscopy

作　　者：余海洋[1] 孙旭光[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《光谱学与光谱分析》2007年第5期858-862,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(40102014);石油天然气集团公司青年科技创新基金项目资助

摘　　要：应用显微红外光谱技术,对江西乐平晚二叠世煤矿B3煤层煤样在不同热模拟温度下的结构组成变化特征及规律进行了研究,结合镜下显微组分的观察和统计结果,剖析了乐平晚二叠B3煤层煤的生烃机理,对该区煤成烃资源进行了初步评价。研究表明煤化学结构主要由杂原子基团、脂族结构和芳香结构三部分组成,其活化能依次增加;煤成烃过程,是一种随着热演化程度的加深,脂族侧链不断脱落,芳香结构不断缩聚,含氧基团逐渐断裂的过程;该煤层中含有的B型基质镜质体和树皮体都是很好的生烃显微组分,是该树皮煤生烃潜力巨大的主要原因。此特点对在华南地区寻找与富含“树皮体”煤系地层有关的油气资源并使“煤变油”产业化具有重要的意义。Fourier transform infrared microspectroscopy （Micro-FTIR） technique was used to investigate the chemical compositions and structures of kerogen from the Late Permian bark coal in the B3 coal seam in mingshan mine, Leping, Jiangxi, at different temperatures. With the observation and the statistics of organic macerals under microscope, the author analysed the model of hydrocarbon generation of the bark coal in the B3 coal seam in mingshan mine, Leping, Jiangxi. And the author also estimated the oil and gas resources in Leping. The results indicate that the chemical composition of the coal is composed by aliphatic structure, heteroatomic compounds and aromatic structure, and their activation energy reduces in turn. Along with the rise in temperature, the intensity of aliphatic structure and heteroatomic compounds decreases obviously, however the aromatic structure chan- ges little. The deamocollinite of B type and barkinite in the bark coal all can generate oil and gas easy, so the bark coal in Leping has a great petroleum-generating potential.

关 键 词：乐平地区 显微傅里叶红外光谱 煤成烃 热模拟 煤成烃机理 

分 类 号：O657.3[理学—分析化学]