Abstract: This paper discusses the petroliferous property of Tibet region in light of characteristics of its regional geological structure andpetroleum geology with analysis of its petroliferous areas and basins. In view of the unique feature in petroleum accumulation condition,Tibet region can be divided into five petroliferous areas such as Qaidam (margin), Bayankelahan,Qiangtang-Changdu, Gondis andHimalayan ones. As for petroleum resource assessment of their complex structural areas, this paper proposes a concept of petroliferousbody composed of basin, residual basin, remnant structural mass and relic deposit, which is regarded as the basic unit for petroleumresource assessment, the target for oil-gas exploration and the core of evaluation. In addition, this paper makes an analysis and estimationof hydrocarbon-generated amount,potential resource amount in main basins of Tibet. The result shows that the petroleum resourcesamount to 9 billion tons, revealing its bright future for exploration, in which Qiangtang basin should be selected as an optimal body, andother basins like Cuole, Biru, Changdu and Gonba-Riding could be as prospective bodies.

Key words: Tibet, petroliferous basin, sequence, prospect, petroliferous body