Ping was last said to be eyeing a potential PSC for the mature Seligi field, off Terengannu.

The large oilfield first came on stream in 1988, and was earmarked for enhanced oil recovery under a $2.1 billion PSC signed between ExxonMobil and Petronas in 2009.

However, sources said Seligi — which had been in decline since 1995 — may now prove too marginal to interest ExxonMobil in further investment, although this could not be independently verified with the supermajor as Upstream went to press.

If