Because of the special petroleum geology conditions in China, presently proved reserves were mainly found in Mesozoic Cenozoic strata in the eastern region and were mainly in structural pools.

• 特定的石油地质条件和勘探阶段导致目前的探明储量，层位上以中、新生界为主，区域上以东中部区为主，类型上以构造油气藏为主。