摘要
干酪根系原始有机质(脂肪酸、蛋白质、色素、纤维素、木质素),在成岩作用过程中聚合而成的不溶的复杂的固态高分子化合物。其结构为环状缩聚核,带有烷基支链和官能团,为杂原子链特别是氧所连接。随着生油岩埋藏的加深、温度升高、时间增长,干酪根热裂解逐渐形成油气。因此,对于干酪根研究的重要性日益引起人们的重视。
Abstract
The characteristics of pyrolysis(P-FID),thermogravimetric analysis (TGA),infrared spectrums(IR),elements composition and carbon isotope ratios of kerogen in the Palaeozoic rocks of the Shaanxi-Gansu-Ningxia Basin have been investigated,and the types of kerogen in vari-ous sequences have been described in this paper.The main types of ke-rogen favourable to oil-gas formation in this basin are sapropel(O)and mixed humus and sapropel(Cb,Ct),because of their high con-tents of C degradation hydrocarbons,It is suggested that,with the grade of metamorphism getting higher,the H/C(atomic ratio) and O/C(atomic ratio)of kerogen tend to de-crease,the H/C(atomic ratio)of asphaltene and the fractionation ofδC to increase.
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