The proved reserves in Cenozoic, Mesozoic, Upper Palaeozoic, Lower Palaeozoic, Proterozoic respectively are 38%, 17%, 30%, 13% and 2% in total.

新生界、中生界、上古生界、下古生界和元古界分别占总探明地质储量38%、17%、30 %、13%和2 %。

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Study on the hydrocarbon source rocks of Lower- Palaeozoic in North China is very important to the Pre- Tertiary oil-gas strategic precinct.

华北地区下古生界烃源岩研究对前古近系油气战略资源选区具有重要意义。

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The reservoir in Upper Palaeozoic of North Ordos Basin is compacted continental hidden reservoir characterized by lower porosity, lower permeability, lower pressure and multilayer overlapping.

鄂尔多斯盆地北部上古生界是陆相致密的隐蔽性气藏，具有低孔、低渗、低压、多层叠置的特点。

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