Crude oil has an inverse relationship with the U.S. Dollar. As you can see here: http://www.marketwatch.com/investing/index/dxy/charts
It may take a week or two to get the fear of Brexit behind up, but when that does happen the supply & demand fundamentals will drive up the price of oil.
BTW natural gas closed at $2.75/mmbtu today and the hot weather spreading east will drive up demand. We should see some very bullish gas storage reports by the end of July.
Oil & Gas prices
Oil & Gas prices
Dan Steffens
Energy Prospectus Group
Energy Prospectus Group