重庆中梁山晚二叠世煤有机地球化学特征.

Samples from K1a coal seam in the Zhongliangshan mine were investigated by microscopy and organic geochemistry. The coal facies parameters show that the Zhongliangshan coal formed in wet forest swamp under reductive environment, and the coal-forming plants were mainly woody plants. After Soxhlet extraction and group components separation, the composition and molecular geochemical features of organic matter were analyzed by gas chromatograph (GC) and gas chromatograph-mass spectrometry (GC-MS). The results indicate that the coal-forming plants were mainly terrestrial higher plants. However, the input of marine phytoplankton cannot be excluded. The coal-forming environment was reductive, and the coal seam underwent relatively higher thermal evolution. Aromatic hydrocarbons were dominated by naphthalenes, phenanthrenes and biphenyls. The isomers of aromatic hydrocarbons with higher thermodynamic stability had an advantage position, and the contents of dibenzothiophenes were higher than dibenzofurans, which also implies the reductive coal-forming environment. The results from microscopic and the organic geochemical analyses verify mutually. [ABSTRACT FROM AUTHOR]