Reference

According to various studies, several commercial gas reservoirs suggest a mantle-derived carbon component. These include:

1. Ordos Basin: Upper Paleozoic gas pools in the Ordos Basin, China, have been indicated to have a mantle-derived carbon component. The integration of δ13C data with rare gas isotopic tracers helps in constraining models of mantle carbon sources. Source

2. Eastern China: Some production wells in eastern China show the existence of mantle methane, though their main components are carbon dioxide and/or nitrogen. Source

3. Xingcheng Gas Field: Mantle-derived CO2 has been suggested to promote kerogen maturation and oil migration, helping to form some oilfields in China. Source

4. Sichuan–Yunnan Block: The region has been selected to discuss mantle degassing based on carbon and noble gas isotopes of spring gases, indicating a mantle-derived carbon component. Source

These findings are significant for understanding the origin of hydrocarbons and the role of mantle-derived carbon in the formation of commercial gas reservoirs.