Abstract
The surface expressions of natural gas seepage can be classified on the basis of spatial dimension, visibility, and fluid typology. Macro-seeps (or seeps) are “channelled” flows of gas, typically related to fault systems. They include gas and oil seeps, mud volcanoes and gas-bearing springs. Gas flux is expressed in terms of mass/time (e.g., kg/day or tons/year). Microseepage is the pervasive, widespread exhalation of gas throughout relatively large areas, conceptually independent from seeps, even if also enhanced along faults. Gas flux is expressed in terms of mass/area/time (for methane it is usually in mg m−2 day−1). Sometimes the term “micro-seeps” is used in the scientific literature, especially in the marine environment to define relatively smaller seeps, not observable, for example, by hydroacoustic methods. However, the term can be misleading as it may be confused with microseepage. This classification is, in theory, valid for either subaerial (land-based) or underwater (marine and lake) environments. The marine environment can have specific gas-seepage structures.
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Etiope, G. (2015). Gas Seepage Classification and Global Distribution. In: Natural Gas Seepage. Springer, Cham. https://doi.org/10.1007/978-3-319-14601-0_2
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