There are more than 500 sedimentary basins in China, covering about 6.7 million km2 and containing an estimated 94 billion tons of oil and 38.14 trillion m3 of natural gas. The undiscovered volumes of inland oil and gas are about 49.42 billion tons and 27.74 trillion m3, respectively. These figures represent 68.02% and 77.99% of the total undiscovered oil and gas resources, respectively.

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