Natural gas is the cleanest green and low carbon energy among various fossil energies. The increasing usage of natural gas will contribute to the decrease of the emission of carbon dioxide into the atmosphere. After the development of several decades, the exploration of natural gas has become more and more difficult. How to greatly improve the exploration efficiency and reduce the exploration cost to promote the rapid development of the natural gas industry is a hot topic in today's natural gas research. Over the past 50 years, with the development of mass spectrometry and other analytical instruments, gas geochemical techniques have become a useful tool and strongly contributed to a better understanding of the origin, source, migration and accumulation of natural gas. The rapid advancements in analytical techniques have deepened our understanding of the stable isotopes such as C, H, N, S as an important scientific tool in constraining processes related to gas formation, accumulation and migration.

In recent decades, natural gas exploration has become more and more complex, and the isotope geochemistry of natural gas has been facing an increasing demand to have a deep understanding of the formation, migration and accumulation of natural gas. New progress of isotopic and analytical techniques in conventional natural gas, unconventional shale gas, coal bed methane, noble gas, non-hydrocarbon gas, gas hydrate and abiogenic gas show the significance of isotope geochemistry of natural gas, but new explorations also bring about new tasks in natural gas, especially in the emerging areas such as unconventional shale gas exploration, high-maturity gas exploration, and deep gas exploration. With the global contributions, this Research Topic aims to demonstrate the application of isotope geochemistry of natural gas to solve these key problems, which will broaden the understanding of current applications and future directions of natural gas isotope geochemistry.

Topic Editors welcome high-quality contributions covering but are not limited to the following themes:

- New technical progress of isotope analysis in natural gas
- Isotope geochemistry of conventional natural gas
- Isotope geochemistry of shale gas
- Isotope geochemistry of coal bed methane
- Isotope geochemistry of noble gas
- Isotope geochemistry of non-hydrocarbon gases
- Isotope geochemistry of gas hydrate
- Isotope geochemistry of abiogenic gas

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