Fire and Ice

The dusting of snow brings out texture around the town, both clearly constructed texture and some patterns of natural flows. What is the dark patch near the lower left?

Closeup Of Town

Here is more detail of the dark area. it is clearly a town with some industrial construction. What is the blue spot - a pond or a painted tank? Why is there now snow around this industrial site - is it a heat island, or the site of a recent fire?

This picture was taken April 1, 2008 over northern China. The area is rich with oil production, so perhaps this is a refinery.