Energy-market risks abound. Israeli attacks on Iranian oil and gas infrastructure. The looming possibility of a global trade war. Up-and-down prices for WTI and Brent. Still, in the midst of all this doubt and instability, oil and gas producers continue to buy and sell major upstream assets in the U.S. — and gobble up entire companies — in ongoing efforts to grow their businesses, reshape their portfolios and/or reduce their debt. In today’s RBN blog, we continue our look at recent big-dollar deals in the U.S. oil and gas industry.