Sept 8 (Reuters) - Chevron ( CVX ) expects to go

"investment heavy" in South Korea on refining and

petrochemicals, an executive with the U.S. oil major said at the

Asia Pacific Petroleum Conference on Monday.

"So there'll be places like Korea where we go investment

heavy in petrochemicals and in heavy oil upgrading, and then

there'll be refineries like here in Singapore, where we've

chosen to not make those big investments and actually get a

better return through most parts of the cycle on capital

growth," said Brant Fish, Chevron's ( CVX ) president, international

downstream.