Kolkata, Sep 2 - State-run energy explorer Oil India Ltd (OIL) will start drilling oil blocks in Libya from October for exploring an estimated two trillion cubic metres of reserves, a top company official said Wednesday.

'We will drill four wells in Libya by 2010-11. We are hoping to begin onshore drilling in Libya by October by digging the first of the four wells,' OIL Executive Director for Corporate Affairs Narendra Bhalla told reporters here.

In its bid to secure oil and gas assets abroad, OIL and its partners - Algeria's Sonatrach and the Indian Oil Corporation - entered into a Rs.5,500-crore accord with the National Oil Corporation of Libya for four exploration blocks.