A tentative evaluation on oil and gas resources in northern Tibet carried out by using the latest remote sensing oil and gas surveys in combining with existing oil and gas geological and geochemical data revealed that oil and gas accumulation totalled about 4 to 6 billion tons in the study area. The focus of survey was in the northwestern part of Qiangtang Plateau, especially in the composite portion of geochemical anomalous low value area with meganapple structure where it is most promising to find out mass oil and gas fields with an accumulation of more than a hundred million tons.