COMPOSITION CHARACTERISTICS OF NATURAL GAS AND THE MECHAMISM OF ITS GENESIS
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摘要: 地质体中的天然气组成复杂多变,导致成因研究困难。然而,长期积累的大量分析资料,己为理论上科学论证提供了可靠的事实依据。本文以热力学理论为基础,联系天然气的实际组成,研究可能生成烃类天然气的四大类型以及三种亚类型的化学反应,并系统地对各类型反应进行热力学分析。同时,在研究方法上是求反应产物(烃类气体)的相对丰度比值,而不是求单一烃类化合物的转化率及反应产物的分压等参数,从而近似地消除了地质体中极为复杂的平衡体系中的温度与压力等因素的影响;另外,在求比值的数学方法上是取地质体中的极限条件,消元解方程,近似求解,因此,复杂的化学问题以及地球化学问题得到了极大程度的简化,进而能够从理论上阐明多种天然气的成因。在掌握了组成与成因的规律后,后生变化影响因素的研究就会变得容易得多,这是十分有利于油气勘探与开发的。Abstract: Based on the thermodynamic theory and combined with the composition characteristics of natural gas, four types and three sub-types of chemical reactions which might form hydrocarbon gases are studied, Thermodynamic analyses of various kinds of reactions are presented systematically, Meanwhile chemical and geochemical methods are used together not only to study the transformation ratio or the condition of the reactions, but also the relative abundance ratio of hydrocarbon compounds, The mathematic relationships among variables are properly treated, Thus, it simplified the complicated chemical and geochemical problems in geological body.
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[1] Welte, D., 1969, Organic Geochemistry of Cardon, In K.W, Wedepohl(Ed):Handbook of Geochemistry, Vol. 11/6L. [2] J.G. Zeikus, 1977, Bacteriological Review, Vol. 41, No.2, P. 514-541. [3] J.W. Larsen, et al., 1981, Intarnal rearrang of hydrogen during heating of Coals Witz Phenol, Fuel, Vol.60, No.4. [4] 何志高, 应用酸解气态烃评价碳酸盐岩生油岩, 石油实验地质, 5卷4期, 1983年. [5] 魏永成等, 四川六地区沼气组份的考察, 沼气第四集, 科学技术文献出版社重庆分社, 1980年. -
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