Near-Surface Geochemical Anomalies Integrated with Seismic and Well Data over the Contact of the Outer Carpathians and the Carpathian Foredeep (SE Poland)

Table 5

Principal statistical parameters of alkene and nonhydrocarbon gas concentrations in analyzed soil gas samples.

Statistical parameters	Alkenes (ppm)			Total alkenes C2-C4	H2	O2	N2	CO2
	C2H4	C3H6	1-C4H8
Minimum (ppm)	b.d.l.	b.d.l.	b.d.l.	b.d.l.	b.d.l.	6.2	61.0	0.01
Maximum (ppm)	0.37	0.11	0.09	0.49	0.232	20.7	89.3	6.29
Median (ppm)	0.005	b.d.l.	b.d.l.	0.01	b.d.l.	18.2	79.1	0.31
Mean (ppm)	0.01	0.001	0.002	0.02	0.009	17.9	79.3	0.47
Standard deviation (ppm)	0.02	0.01	0.01	0.03	0.020	1.9	1.9	0.57
Skewness (ppm)	7.4	12.7	5.4	8.1	4.5	−2.4	−0.2	5.0
Percentage of samples (%)	51.2	5.1	13.1	58.2	44.5	100	100	100

Percentage of samples with concentration of a given component over the detection limit; minimum, maximum, median, mean, and standard deviation value in vol.%. b.d.l.: below detection limit.