Shell-BG deal just the start of energy M&A: Analyst By: CNBC.com News April 08, 2015 at 08:22 AM EDT The energy industry is overdue for mergers and acquisitions and the field has grown too crowded, Oppenheimer's Fadel Gheit tells CNBC. Read More >> Related Stocks: Exxon Mobil Oppenheimer Holdings Royal Dutch Shell Cl B ADR