煤中干酪根在热演化中结构变化的红外光谱研究  

The FTIR Study on Structure Changes of Coal Kerogen in the Maturation Process

作　　者：李岩[1,2,3] 王云鹏[1] 赵长毅[4] 卢家烂[1] 

机构地区：[1]中国科学院广州地球化学研究所,有机地球化学国家重点实验室,广州510640 [2]西安地质矿产研究所,西安710054 [3]中国科学院大学,北京100049 [4]中国石油勘探开发研究院,北京100083

出　　处：《矿物岩石地球化学通报》2013年第1期97-101,106,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重点基础研究发展规划项目资助(2007CB209501);国家油气专项资助(2011ZX05008-002-13);国家自然科学基金资助项目(40872091)

摘　　要：为了研究煤中干酪根的不同抽提方法对热演化过程中结构变化的影响,对新疆塔里木盆地库车坳陷阳霞侏罗纪煤中的可溶有机质采用不同的抽提方法得到部分干酪根,并对其在不同热模拟温度下的结构组成变化特征进行红外光谱测定。结果表明,干酪根的结构主要由三部分组成:脂族结构、芳香结构、含氧官能团。随热演化进行,脂族结构和含氧官能团不断脱落,芳香结构不断发生缩合。通过三个系列的比较发现,不同抽提方法导致了初始状态烃类含量的不同,因而红外光谱参数的变化趋势也有所不同。三个系列随热演化程度的进行,从Ⅲ1型干酪根转变为Ⅲ2型干酪根,生油能力降低,主要为生气型干酪根。To recognize the impacts of different extraction methods in structure changes of coal kerogen in maturation processes, Fourier transform infrared spectroscopy （FTIR） was used to study the chemical structures of kerogen from a Jurassic coal＇in the Kuqa Depression, Xinjiang at different temperatures after dissolvedhydrocarbons had been extracted by three different methods. The results indicate that kerogen is composed by aliphatie structures, aromatic structures and heteroatomic compotinds. As temperature increasing, the heteroatomic compounds and ali- phatic structures are gradually separated out while the aromatic structures gradually experience a condensation process. By comparing the chemical structures of kerogens of three series, our study shows that the initial hydro- carbon yields from the different extraction methods determine the FTIR indices of the kerogens. In addition, it is suggested that the kerogen types change from type Ⅲ 1 to Ⅲ 2 with the decreasing of hydrocarbon generation levels.

关 键 词：红外光谱 热模拟 煤 干酪根 吸收峰 

分 类 号：P575[天文地球—矿物学]