Oil prices have been volatile this week on rising geopolitical tensions among some of the largest global oil producers. Investors who would like exposure to the exploration and production space without all the risk associated with wild swings in oil prices should consider a pair trade based on a pair of Goldman Sachs ratings this week. The Analyst Goldman analyst John Nelson on Thursday downgraded Resolute Energy Corp REN from Buy to Neutral and lowered his price target from $52 to $39. Nelson also upgraded PDC Energy Inc PDCE from Neutral to Buy and lowered his price target from $67 to $61. SourceUndirectional movement still holds. Better to wait for more clear signals. $REN, Resolute Energy Corporation Comon Stock / D