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Figure 6 | Geochemical Transactions

Figure 6

From: Natural gas at thermodynamic equilibrium Implications for the origin of natural gas

Figure 6

Equilibrium plot of C 1 –C 3 (eq. 1) in 1600 natural gases (Fig. 5). Hydrocarbon concentrations are % vol in C1 – C5. These gases do not include compositions with C2 or C3 < 0.5% vol since the data, rounded off to the nearest tenth %, injects unacceptable error into the x and y functions. The dark line through the data is the regression line for the power equation y = 0.0282 x1.308, where y = (C2H6)2, x = (CH4)*(C3H8), and R2 = 0.840. The dashed line is for x/y = 12.0, thermodynamic equilibrium at 400 K [31]. Gas compositions were obtained from the U.S. Department of Interior [10]. The mean log Q (Q = (x/y) for the data = 0.90 ± 0.43.

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