古生界海陆过渡相黑色泥质岩系显微组分特征及生气潜力评价

Macerals Characteristics of Black Argillite from Paleozoic Marine-continental Transitional Facies and Evaluation on their Gas-generating Potentiality

本文对华北和下扬子区两种类型的海陆过渡相地层进行详细的有机岩学工作，研究了泥质岩系中有机显微组合的岩石学特征、有机显微组成特征，表明壳质组是重要的生气母质。根据气源岩中有机显微组分组成特征，结合模拟实验结果提出产气指数的计算方法，并根据产气指数判断气源岩的生气潜力，下扬子区泥岩为好的生气源岩，华北地区的泥岩为较好的生气源岩，它们比煤具更大的生气能力。

Black argillite samples from North China and Lower Yangtze Region are selected to study in detail by methods of organic petrology. Organic matters of North China samples are mainly from terrestrial plant, and those of Lower Yangtze samples mainly derived from water plant. Exinite in argillite has estuary configration, it shows that exinite has generated a large amount of gas in maturation process. Thus, exinite of argillite plays an important role in gas resource of North China.Gas-generating indices (GI) are put forward on the basis of the maceral composition and gas amount of single maceral in experiment. GI value stands for gas-generating potentail of source rocks. Gas-source rocks are divided into good, fairly good, general and poor types according to their GI values. Argillite of Lower Yangtze Region is a good gas-source rock, and that of North China is fairly good one. They have stronger gas-generating potential than coal.