The surprise departure of BP's exploration boss has turned the spotlight on an oil search strategy

LONDON, May 23 (Reuters) - The surprise departure of BP's exploration boss has turned the spotlight on an oil search strategy that, after years of spending cuts, is focusing mainly on expanding existing fields rather than venturing expensively into the unknown. That caution reflects a firm chastened by the $55 billion cost of its 2010 Gulf of Mexico spill, and needing to squeeze every last drop out of a sharply reduced exploration budget at a time of low oil prices.

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