Feb 20 (Reuters) - Senex Energy Ltd SXY.AX :
* EXPECTS TO RECOGNISE NON-CASH IMPAIRMENT CHARGE OF $80 MILLION IN HALF YEAR RESULTS
* ANNOUNCES IMPAIRMENT OF NON-CORE COOPER BASIN EXPLORATION ASSETS
* IMPAIRMENT DOES NOT IMPACT SENEX'S OIL AND GAS PRODUCTION, RESERVES, EBITDAX OR CASH