Abstract:

Based on the polarizing microscope, fluorescence microscope and other technical means, aiming at the oil fluid inclusion in the Carboniferous-Permian volcanic reservoir of Santanghu basin, the fluorescent color, spectral shape and Q quotient (red-green quotient) were studied. The Q quotients of oil fluid inclusion which have blue-white, yellow and orange fluorescence is respectively 0-0.22, 0.05-0.46 and 0.17-0.51, showing the maturity of the oil inclusions decreasing. Some oil fluid inclusions have yellow fluorescence and low Q quotient. These samples are mainly collected from the deep reservoir of Carboniferous and southern nappe zone as well as the north slope zone. Overall, we recognize that the source of Lucaogou Formation is the chief oil source of Santanghu basin. Oil fluid inclusion has various fluorescence colors which reflect multi-period accumulation and mixed sources. Carboniferous has a higher maturity and is potential hydrocarbon source rock. Slope zone reservoirs in north with oil generation formations in the above and below migrate and accumulate by patterns of the “injection migration”.

Key words: oil inclusion, fluorescence spectrum, volcanic, petroleum reservoirs, Santanghu basin