Natural gas is widely distributed in nature, with many types of genesis and different degrees of thermal evolution, and its geochemical characteristics are also diverse, so it is difficult to identify it with a unified index.
Practice shows that it is more reliable to use multiple indicators to make comprehensive judgments than to use a single indicator. In terms of the items involved in the identification of natural gas genesis, there are mainly four items: isotopes, gas components, light hydrocarbons, and biomarker compounds. Some of the content of the determination criteria are clear and of absolute significance, and some of the content overlaps in the three types of genes. Only has a certain relative meaning.
