REUTERS: The battered energy sector may begin to brighten a little as companies report second-quarter results, but barring a big increase in the price of oil, the sector won't be able to sustain even current share prices going forward, analysts and investors say. Oil prices have fallen at a much steeper clip than energy shares in the 13 months since June 23, 2014 - when oil prices hit a nine-month peak - keeping valuations high even as share prices have plunged.