Royal Dutch Shell's (RDSa.L: Quote, Profile, Research, Stock Buzz) SPDC onshore oil joint venture in Nigeria is producing at less than 30 percent of capacity due to unrest in the Niger Delta and funding problems, the unit's managing director said on Tuesday.

Mutiu Sunmonu, Managing Director of the Shell Petroleum Development Company of Nigeria Limited (SPDC), told a Senate committee that Nigeria had lost $47 billion in revenues since 2006 as a result of shut-in SPDC output alone.