ISLAMABAD (APP) - The countrys largest exploration company Oil and Gas Development Company Limited (OGDCL) has witnessed trend of declining production from its mature oil fields, necessitating tangible measures to explore further hydrocarbon resources for meeting growing energy needs. The crude oil production during July 2010-March 2011 has been marginally lower compared with the corresponding period of the last year, crude oil in nine months-2009-10 was 38,610 barrels per day but in corresponding period in 2010-11, 37,302 barrels were produced per day, the companys official report says. Elaborating, the document says, crude oil production from the companys own and operated joint venture fields decreased by 4.9pc mainly due to the production from Kunnar, Pasakhi, Bobi, Tando Aslam and Sono on account of natural depletion of reserves and from Chanda and Mela on account of short lifting of crude oil after damaged road network.