| Angdarco Jurassic dolostone paleo-reservoirs located at Angdarco in Southern Qiangtang Depression are the largest oil reservoir belt in Qiangtang Basin, which is significant in Tibet′s petroleum exploration. It is shown that the Angdarco paleo-reservoirs can be classified as the ones with low porosity and low permeability to medium porosity and medium permeability, which belong to good reservoirs. The group components in oil are characterized by low content of saturated hydrocarbon but high content of nonhydrocarbon and asphaltene, which is inclined to aromatic-asphaltic oil and aromatic-naphthenic oil. Two source-reservoir-cap assemblages are divided into. One of them, the J1-2 Buqu-Quse assemblage, is regarded as being of good potential. It is concluded that the paleo-reservoir belt is the residual anticline in which hydrocarbon had been accumulated during late Jurassic period and was damaged during Himalayan orogeny by thrusting.
Key words： Peng Qinghua： Geology Engineer. Add:, 2 Beisan Duan, Yihuan Rd., Chengdu, Sichuan, 610081, China |
