Well, if Spruance carried 1600 tons of fuel and reached 8000 tons with it, Then I guess 055 could roughly be carrying 3000 tons of fuel if its max displacement is some 12,000 tons. Ballast water is usually up to 30-50% of total cargo (couldn't find any actual figures for warships though). Even if there's not much fuel in 055 in that image, there should be ballast water instead. At least 1 ton worth of fuel or ballast water. Still not precise enough to conclude anything. Empty displacement possibly 8000-9000 tons, depending on max displacement?