句容盆地龙潭组煤成烃的地球化学特征

GEOCHEMICAL CHARACTERISTICS OF HYDROCARBONS GENERATED FROM COALS OF THE LONGTAN FORMATION, THE JURONG BASIN

尚慧云 徐伟民 童箴言 夏延

Shang Huiyun Xu Weiming Tong Zhneyan Xia yan

石油工业部石油勘探开发科学研究院 2. 石油大学 3. 江苏油田地质科学研究院

Research Institute of Petroleum Exploration and Development, Ministry of Petroleum Industry

本文主要对句容盆地上二叠统龙潭组煤岩组份及地球化学特征进行研究,以探讨其成烃的可能及规模.研究表明,龙潭组煤阶属气-肥煤演化阶段,沥青A含量为4.89%.族组份中沥青质加胶质含量在50%以上.芳烃和饱和烃次之,且芳烃比饱和烃高3倍以上.经气相色谱、液相色谱、红外光谱、色谱-质谱等分析,其有机质性质呈现富高等植物特征.另外,据煤岩组份分析和热模拟试验,壳质组含量高达22.9%,液态烃产率达36mg/g·Corg,表明龙潭组煤具有一定生烃潜力.

In order to approach the possibility and scale of hydrocarbon generation of the Longtan Formation of Upper Permian System in the Jurong Basin, the paper studied the maceral composition and geochemical characteristics of coals. The result shows the coal of the Longtan Formation is in the evolutionary stage of gas-fat coals, the content of bitumen A is 4.89%; which is composed of more than 50% resin and asphaltene, and the content of aromatics is three times higher than that of saturated hydrocarbons.The organic matter is rich in higher plants, according to the analyses of GC,LC, IR spectroscopy and GC-MS. Furthermore, maceral examination and thermal simulated experiments were made, which showed that the content of exinite is 22.9%, and its productivity of liquid hydrocarbons is 36mg/g.c. The coal in the Longtan Formation is thought to have definite hydrocarbon generating potential.

https://doi.org/10.11781/sysydz198901033