Effects of the Cenozoic tectonism on the oil and gas preservation in the Qiangtang Basin

The Qiangtang Basin in the hinterland of the Qinghai-Xizang Plateau is a largeMesozoic-Cenozoic marine residual basin in China.However,it has been doubtful about its preservation of oil and gas because of intensely uplifting of the Plateau,frequent neotectonic movement and extensive outcropping of the Upper Jurassic strata(the target strata).The preservation of oil and gas has thus become a focus of attention in the assessment of oil and gas in the basin.The investigation of the Cenozoic tectonism shows that in spite of the uplifting of the Qiangtang Basin on the whole in response to the rapidly uplifting of the Plateau from the Pleistocene onwards,the geological structures are less deformed and better preserved in the basin than in the other basins on the Plateau.