Detecting hydrocarbon microseepage using hydrocarbon absorption bands of reflectance spectra of surface soils

The microseepage of gaseous hydrocarbons often creates a soil atmosphere containing lighter hydrocarbons (C1-C5). The gases in the soil may be sampled and analyzed to determine the specific mix of hydrocarbons using a gas chromatograph.These same hydrocarbon gases are also adsorbed by clay particles in the soil. Soil samples then may be collected and analyzed for gas content using a gas chromatograph, or in this case, a hyperspectral spectrometer. The reducing environment between the reservoir and the surface along with some associated chemical changes may also be detectable. For example, iron often reduces from a ferric to a ferrous state, and minerals such as feldspars and micas may alt...

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