摘要
本文主要从四个方面讨论了滇西镇安盆地泥炭、软褐煤的有机地球化学特征。该盆地泥炭、软褐煤的氯仿沥青“A”含量明显高于其它煤级较高的煤。随早期煤化作用的加深,氯仿沥青“A”及其非烃类明显减少,而沥青质和芳香烃则有增加的趋势,饱和烃变化不规则;饱和烃的碳数分布很宽,介于C_(17)—C_(38)之间,主峰碳为C_(29);泥炭的T_(max)大于400℃,随早期煤化作用加深,T_(max)无增大趋势;Ng随早期煤化作用加深并未增大,其与凝胶化程度呈明显的正相关关系。
This paper mainly deals with the organic gcochemical characteristics of peat and soft lignite from the Zhenan basin, western Yunnan.The chloroform bitumen 'A' content of the peat and soft lignite ranges from 6.86 to 10.04％ (daf). It is generally higher than that of other coals with higher ranks and decreases with intensified coalification in the early stage. The content of the heterocompounds ranges from 28.50 to 43.60％ and is reduced with intensified coalification in the early stage; however, the asphaltene content (40.07—51.76％) increases obviously, the aromatic hydrocarbon content (7.00—9.48％) increases slightly, and the alkane content (3.69—10.26％) varies irregularly. The 'GC' analysis shows that the carbon number of n-alkanes ranges from C_(17) to C_(38), the C_(max) being C_(29), showing an odd-carbon preference, the CPI and OEP range seperately from 2.58 to 3.82 and from 2.44 to 4.04. The analysis of 'Rock-Eval' indicates that the T_(max) of the peat is over 400％ and that the T_(max) hows no tendency to increase with intensified coalification in the early stage. The S_3 decreases totally, but not so evidently as O_(daf)+S_(daf). The 'Ng' of the peat and soft lignite is of the order of magnitude of 10^(15) and shows no tendency to increase with intensified co alification in the early stage. It is associated with the gelification degree: the higher the gelification degree is, the greater it would become. The 'G' has an increasing tendency with intensified coalification in the early stage. The ESR spectrum of the chloroform bitumen 'A' is very complex and the small peak at 3194 GS and the peak before 3249 GS would become smaller with intensified coalification in the early stage.
出处
《地质论评》
CAS
CSCD
北大核心
1991年第2期97-106,共10页
Geological Review
