湘中南龙潭煤系不同演化程度煤的煤岩学特征及有机地球化学特征

通过对湘中南龙潭煤系不同煤级煤样的煤岩学和有机地球化学研究，概括了湘中南龙潭煤系煤的有机显微组成和主要有机地球化学特征，指出其中的气煤、肥煤和焦煤是具有较高生烃潜力的烃源岩，壳质组和基质镜质体是这一阶段煤中的主要生烃组分。

COAL PETROLOGRAPHICAL AND ORGANIC GEOCHEMICAL CHA RACTERISTICS OF DIFFERENT EVOLUTIONARY STAGE COALS OF THE LONGTAN FORMATION IN MIDDLE SOUTHERN HUNAN

On the basis of the reseach of coal petrography and organic geochemistry, the organic petrologic and organic geochemical characteristics of coal samples from the Longtan Formation in middle southern area of Hunan Province have been discussed. The results show that the gas coal, fat coal and coking coal are in the evolutionary stage of maturity, and hydrogen rich macerals including sporinite, suberinite, resinite, exsudatinite and hydrogen rich vitrinite are higher in content in these samples. Furthermore, their contents of bitumen A are in the range of 14 17～15 77mg/g, S 1+S 2 are from 101 90mg/g to 163 81mg/g. Although their transformation ratios are all lower than oil source rock, they are a kind of good source rock for generating condensate oil and wet gas. However, the lean coal and anthracite are beyond the evolutionary stage of maturity, and hydrogen rich macerals are low, so their indices of hydrocarbon generating potential are correspondingly low, but they are a kind of source rock.