the logo of the organization of the petroleum exporting countries opec is pictured on the outside of the new opec headquarters in vienna march 16 2010 reutersheinzpeter baderfile photo aug 17 reuters  inadequate investment in the oil and gas sector is the chief reason behind the recent spike in prices and opec is not to blame opec secretarygeneral haitham al ghais told cnbc on wednesday there are other factors beyond opec that are really behind the spike we have seen in gas and in oil and again i think in a nutshell for me it is underinvestment chronic underinvestment” he told cnbc httpscnbcx3quez6h “opec is not behind this price increase” reporting by jyoti narayan in bengaluru editing by edmund blair