吐哈盆地侏罗纪煤中主要组分结构特征与生烃性分析  

Micro-FTIR Spectroscopy of Maceral from Jurassic Coals in Tu-ha Basin

作　　者：孙旭光[1] 陈建平[2] 王延斌[3] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]石油勘探开发科学研究院,北京100083 [3]中国矿业大学北京分校,北京100083

出　　处：《沉积学报》2002年第4期721-726,共6页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目 (批准号 :40 1 0 2 0 1 4 )资助

摘　　要：在高纯度煤岩显微组分分离富集的基础上 ,应用透射式显微傅里叶红外光谱技术 (Micro FTIR) ,对吐哈盆地侏罗纪煤中的主要组分—镜质体、丝质体、角质体、藻类体的结构组成进行了测定。结果表明 :藻类体主要由长链脂族结构组成 ,芳香结构含量相对较少 ;角质体和基质镜质体中含有较丰富的芳香结构以及长链脂族结构 ;而丝质体则主要由芳香结构组成 ,脂族结构含量很少。显微组分的这种结构特征决定了藻类体具有很高的生烃潜力、角质体和镜质体的生烃潜力中等、而丝质体的生烃潜力则很低。对于吐哈盆地煤成油来说 ,由于藻类体主要由长链脂族结构组成 ,并且生烃潜力也高 ,因此其具有高的液态烃产率、丝质体的产油率最小、角质体和镜质体的液态烃产率中等。由于镜质体是本区煤中含量最高的组分。因此 ,对于吐哈盆地所形成的具有工业规模的油田来说 ,镜质体应该是主要的贡献组分之一。但对于富含藻类体的厚层状烛藻煤 ,由于它类型好 ,品质高、生烃潜力大、以中长链脂族结构为主 。Fourier transformation infrared microspectroscopy (Micro FTIR) is one of effective ways for identifying the chemical structure. Based on the high purity coal macerals separating and concentrating,in this paper, Micro FTIR technique was used to investigate the chemical composition and structures of alginite, sporinite, cutinite, desmocollinite and fusinite from Jurassic coals in Tu ha basin. The results show that the chemical structure of aliginite and sporinite are mainly composed of long aliphatic side chain, and minor amounts of aromatic compounds. Cutinite and desmocollinite are mostly composed of aromatic compounds, in addition to large amount of aliphatic compounds. Whereas fusinite are dominant by aromatic structure. These indicate that aliginite and sporinite are one of the best oil source rocks, with the highest hydrocarbon generation potential; cutinite and desmocollinite are also the better oil and gas source rocks, and have higher hydrocarbon generating potential; fusinite has little hydrocarbon generating potential. Desmocollinite is one of the most amount of macerals in Jurassic coals in Tu ha basin, so it is one of the most important macerals for contribution to oil from coals in Tu ha basin

关 键 词：侏罗纪 吐哈盆地 显微傅里叶红外光谱 显微组分 结构组成 生烃潜力 煤成油 

分 类 号：P618.11[天文地球—矿床学] P593[天文地球—地质学]