Exclusive - Shell's exploration boss Powell to step down

By Ron Bousso LONDON (Reuters) - Royal Dutch Shell's head of exploration Ceri Powell will step down next month, capping seven years in the role marked by sharp cutbacks in the company's search for new oil and gas reserves amid the industry's deep downturn since mid-2014. Powell, a geologist who joined Shell in 1990 and a vocal supporter for strengthening female involvement in the sector, will depart on February 13 and become managing director of Brunei Shell Petroleum the following month, accord