I am surprised that China does not have a bigger stated reserve given their land mass.
Land resources in China tend to be gas; especially in Western China where buses and now taxis have been running on gas for decades. Oil mainly comes from offshore and it is quite a long way (90 n.m.) offshore. A decade ago when I was there pipelines did not exist; it was exported by tanker from FPSOs.
Not the best arrangement during a punch-up.