However, oil and gas production shrunk at an annual average rate of -1.8% during 2008-2013 partly due tomaintenance works.The largest oil and gas operator and producer remains the state-owned Brunei Shell Petroleum (BSP) by virtue of its control of the major oil and natural gas fields.While BSP operates a concession, the exploration and development of a number of new onshore and offshore blocks have been offered on production sharing basis