Stratigraphic position of high-quality source rocks and distribution of oil-bearing dolomites in the Qiangtang Basin

The geological investigation and petroleum exploration in the Qiangtang Basin, northern Tibet have been taken for about 25 years, but the commercial reservoirs are not found and the exploration targets and prospects are in debate. This paper focuses on the distributions of high quality source rocks and oil-bearing dolomites in the outcrops and drills in order to discuss the hydrocarbon-rich depressions and exploration targets. Basing on the theories of petroleum explorations, we have studied the marine Jurassic oil shales of Biluocuo and Xichangliang and structural units gotten from the seismic exploration and have chosen the hydrocarbon-rich depressions. Using the oil-bearing dolomites of the Buqu Formation in the Longeni, Angdaercuo and Emasi as the marker horizon and referring the dolomite reservoirs in southern China, we have suggested the spatial distribution of dolomites which are probably the main exploration targets for the strategic breakthrough of oil exploration in northern and southern depressions of the Qiangtang Basin.