On CTIs website, the knowledge of the origin of surface gases is stressed; why should I be interested in this, in particular since other methods are offered to record seepage manifestations?
Surface gas is the most direct way to track seep gases. If, in fact, some surface HC gases have nothing in common with seepage, some of these “seepage manifestations” may be in error. HC-microbes do not differentiate between seep ethane and soil in-situ ethane, for example; surface “compound patterns” cannot differentiate the several sources of surface HC; mineral alterations believed to be associated with seep gases may in fact result from pervasive biological soil HC gases. It should be remembered that micro-seep detection is about low level seep rates comparable to in-situ biological C1-C30 production in the soil. Smith and Ellis demonstrated this problem as early as 1963! Thus, some knowledge on soil processes and soil environments is essential to evaluate a range of surface exploration data and their day-to-day applicability.
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