Marine sediments with enormous thickness deposited in Qiangtang Basin

North Tibet inLate Paleozoic-Jurassic. This provides favourable material base for hydrocarbon generation.According to the deformation feature and the framework of the basin's basement

the basincould be divided into three tectonic units as North Qiangtang Depression

GangmacuoXiyargang Uplift and South Qiangtang Depression. The North Qiangtang Depression is considered as the most prosperous one for hydrocarbon exploraton due to its well-developedsource-reservoir-cap assemblage and relatively gentle deformation and transformation. Duogecuorenxi

Qulonghe-Cuoni and Donghu in the depression are the most favourable blocksand could be taken as the first targets for oil exploration.