Benchmark domestic equity indices, Sensex and Nifty, were trading with gains in the afternoon trade today, supported by Oil and Gas, Energy and Healthcare sectors. The 30-share BSE Sensex gained  248 points, or 0.32 per cent, to 78,213, and the NSE Nifty50 added 107 points, or 0.45 per cent, to 23,723, when reports last came in.