岩浆热作用下有机质化学成份超前成熟——五牧场区煤的有机地球化学特征

The Pre-maturation of the Chemical Composition Comparedwith Texture in Organic Matter underthe Magmatic Thermalism

本文通过地质、有机地球化学等综合方法(沥青“A”抽提、热解模拟、气相色谱、红外光谱、X—衍射、电子顺磁共振等)研究了五牧场矿区大磨拐组煤系中连续变质系列的褐煤——瘦煤。查出煤等有机岩具有Ⅱ型干酪根的富H特征,提出在岩浆热力作用下,有机质的化学成分超前于结构成熟,指出本区应注意油、气的找寻。

A series of continuous metamorphism from brown to lean coal in the coal measures of Dameguai formation of Wumuchang coal district is studied by methods of geology and organic geochemistry (extraction of bitumen 'A'; thermal modelling; gas chromatography; infrared spectrum: X diffraction; electron microscope; paramagnetic resonance etc.)It is found that the organic rock such as coal etc. in this area has the characteristic of rich-hydrogen of type n kerogen. The authors show that under the action of magmatic thermalism the maturation of organic texture was preceded by its chemical composition maturation, and hence the discovery of oil and gas should be noted in this area.