摘要
腐殖煤的化学结构和热降解机理,目前仍是煤成气研究中的薄弱环节。本文根据我国腐殖煤、镜质组、石墨总共154个样品的煤岩学数据和煤化学数据,提出了褐煤结构式、腐殖煤热降解步骤、腐殖煤生烃率的模型,对腐殖煤元素组成的变化规津、镜质体反射率同原子比的关系、生烃门限、气态产物化学组成和δC值的变化趋势、煤成烃气藏和二氧化碳气藏的成因,进行了统一讨论,阐述了它们之间的内在联系。
Abstract
Based on the statistical data of coal chemistry and coal petrology of 154samples of coal, graphite and vitrinite collected in China, this paper proposesa model of structural formula, thermal evolution process and hydrocarbon pro-ductivity of humic coal, and comes to following conclusions: 1.The typical molecular formuia of Chinese lignite with a vitrinite reflec-tance of 0.359% is CHO. 2.Coalification can be divided into five stages. In the second stage, thebreakaway of methoxyl groups raises the curtain on the formation of hydrocarbon. 3.Under geological condition, the hydrocarbon productivity P of residualcoal (water- and ash-free basis) conforms to following equation: p=402e, (0.30≤R<4.80) Where vitrinite reflectance R is expressed as percentage, and P is mt. Under the condition of simulation test, the hydrocarbon potential P con-forms to following equation: P=598(R-0.20)e, (R≥0.359).
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