BEIJING -(Dow Jones)- Driven by energy security concerns, China is penciling in at least two more phases in its current program to build up the nation's petroleum reserve capacity. But no timeframe has yet been disclosed.

"Our nation's plan for the next five years is to massively increase oil reserve capacities," an official at the National Development and Reform Commission told Dow Jones Newswires Friday.

..."The capacities of the current four bases are far from enough. We are planning the second and third phases of the national oil reserves buildup in addition to the first phase," said the official, who declined to be named.