Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Swiss Journal of Geosciences

Table 3 Concentrations, retention coefficients and partial pressures of N₂, CH₄, C₂H₆ and C₃H₈ in the rock surrounding the borehole BHT-1

Parameter	N₂	CH₄	C₂H₆	C₃H₈
K′_d (–)	0	0.25	3.98	12.59
K_d (L/kg)	0	0.02	0.28	0.88
K ^OM_d (L/kg organic C)	0	2.18	34.62	109.47
C₀ (mmol/L)	2.2	0.30	0.023	0.0125
C_t (mmol/L)	2.2	0.375	0.115	0.170
Partial pressure at equilibrium with C₀ (bar)	3.16	0.19	0.01	0.007

C ₀ concentration of the dissolved gas in pore-water, C _t total concentration of the gas in the rock (except non-reversibly sorbed gas)