Tullow to book $1.5 billion writedown on oil price outlook, exploration

LONDON (Reuters) - Tullow Oil expects to report a $1.5 billion (1.15 billion pounds) writedown after lowering its long-term oil price assumptions by $10 to $65 a barrel, an announced reduction in reserves in Ghana and disappointing exploration wells, it said on Wednesday."Tullow expects to report pretax impairments and exploration writeoffs of c.$1.5 billion (c.$1.3 billion post tax)," it said."Writeoffs include Jethro, Joe and Carapa well costs in Guyana as a result of drilling results and..