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Carbonate rocks range in age from Sinian (upper Proterozoic) to Triassic and are widely distributed in China. In the northern, southwestern, and southeastern parts of eastern China, these rocks contain abundant oil seeps and disseminated asphaltic substances. Large gas and small oil accumulations also have been discovered in these strata. Geologic and geochemical evidence suggests that the carbonate rocks are at least partially the source of these petroleum accumulations.

In the eastern part of China, hydrocarbons in carbonate rocks have generally undergone heating to high levels and have reached a much higher stage of thermochemical evolution. A late-stage evolution...

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