西藏乌郁盆地油苗的发现及找油意义

THE DISCOVERY OF PETROLEUM SEEPAGES IN WUYU BASIN IN TIBET AND ITS SIGNIFICANCE FOR HYDROCARBON EXPLORATION

黄泽光 曾华盛 汤慧珉 袁玉松

Huang Zeguang Zeng Huasheng Tang Huimin Yuan Yusong

中国新星石油公司勘探研究院, 湖北 荆州 434100

Jingzhou Institute of Petroleum Exploration and Development, CNSPC

最近,我们在西藏乌郁盆地日贡拉组发现了油苗(沥青脉)及500余米厚的暗色泥质生油岩。地化分析研究表明生油岩以好生油岩为主,有机质类型主要属过渡型,演化程度总体处于低成熟阶段,部分为成熟阶段。油苗(沥青脉)来源于日贡拉组泥岩层。此外,芒乡组下部煤及煤系地层具有很好的煤成烃潜力。乌郁盆地存在过油气生成和运聚的历史,具有寻找小型油气田的良好前景。

Recently,the birumen within Rigongla formation of Wuyu basin in Tibet and 500 meters of dark shale rocks in the basin have been discovercd.The geochemical analysis indicates that the quality of source rocks is favourable,the organism belongs to type Ⅱ and is dominated by low maturity and partly within the high maturity in evolution.Thte petroleum seepages(bitumen)come from the Rigorgla formation.Furthermore,the coal beds and coal bearing beds in lower part of Mangxiang formation of the basin are of favourable coal related hydrocarbon potential.It can be concluded that the generation,migration and accumulation once occured within the Wuyu basin and has shown a potential for oil and gas exploration.

https://doi.org/10.11781/sysydz199803248