As i nearly finished my Master in energy economics you could sent it me too... but i coud help you only with the content...
Are you writing the essay incorporation with Shell or the Venezuelan Oil company resp. think about getting an job in one of these companies? If so try to write the essay mainly from their point of view...
Don't forget the point that oil will/could be compansated by other energies as the heating system will be changend from oil to gas, coal, woodpellets and so on... in a long term (5 or 10 years) if the prices are rising or extremly high... so the OPEC must be interested in oil-prices which aren't too high...