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

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.