形成煤成油田的制约条件  

Key formation conditions of coal-derived oilfields

作　　者：郭春清[1] 

机构地区：[1]中国石化胜利油田地质科学研究院

出　　处：《石油勘探与开发》2005年第5期69-73,共5页Petroleum Exploration and Development

基　　金：国家自然科学基金(40373024)

摘　　要：煤成油田的形成受到多方面因素的制约。形成煤成油田的有利条件是:煤系沉积于湖湾沼泽相或三角洲间湾沼泽相,具备较佳的生油显微组分和较好的地球化学综合指标,具备较低的热演化程度、较佳的孔隙结构并经受了适宜的地质营力;含煤盆地在宏观上具备完整的湖(海)平面变化旋回层序,局部有良好的岩性组合和构造;最直接的标志是已发现的原油或油砂具备典型煤成油的地球化学特征,即族组成中饱和烃含量异常高、饱/芳值高、非烃和沥青质含量低;具有反映高等植物生源的甾、萜烷分布特征;处于低成熟演化阶段;沉积环境偏氧化;富集重碳同位素。The formation conditions of coal-derived oilfields are rigorous and restricted by various factors. The favorable conditions are that the coal-measuring is deposited in lacustrine or inter-deltaic paludal facies with better maceral composition and suitable geochemical conditions, low evolution degree and better pore configuration underwent proper geological agent. The most direct markers should be the typical organic geochemical features of coal derived oil, including extraordinarily high content of saturated hydrocarbons, high ratio of saturated/aromatic hydrocarbons, low content of nonhydrocarbons and asphaltene, sterane and terpane distribution indicating biological source from higher plants, low maturity and oxidative sedimentary environment and richness in heavy carbon isotope.

关 键 词：煤岩 煤成油 煤成油田 有利条件 

分 类 号：P593[天文地球—地球化学]