Sedimentary characteristics and oil-gas geological significance of the Middle Jurassic Buqu Formation in the Ersma area， Southern Qiangtang Basin， Tibet

Through analyses of sedimentary characteristics, sedimentary facies and paleogeography, it is considered that tidal flat facies, lagoon facies and shelf facies occurred in the Ersma area and barrier beach facies occurred in the covered Jiangyumaluo area, southern Qiangtang Basin, Tibet. According to the spatial distribution of sedimentary facies, there were denudation area, tidal flat area, lagoon area, barrier beach area and shelf-slope area from the north to the south, respectively. It is considered that the granulated limestone and dolomite reservoirs may developed in the Jiangyumaluo barrier beach (or barrier island). It is suggested that an oil-gas investigation well should be deployed in the Jiangyumaluo-Ersumuma areas, which may drill into oil-bearing dolomite or granular limestone, and may reach the strategic discovery of oil and gas resources in the studied areas.