Methane in Soil Gas and Its Migration to the Atmosphere in the Dawanqi Oilfield, Tarim Basin, China
Table 5
Comparison of CH4 in flux, soil gas, and absorbed gas in Dawanqi oilfield.
Sampling sites
CH4 flux
CH4 concentration in soil gas
CH4 concentration in absorbed gas
Temperature
Faulted zone
543-28-3
222.5
2228.0
11.7
29.0
554-11
75.2
598.3
3.8
30.0
545-12
69.2
1834.1
5.1
24.0
18-7
41.6
1148.5
14.8
24.0
554-14
2.8
904.1
5.6
29.0
546-20
1.5
1164.0
6.3
29.0
554-15
0.8
2631.0
2.3
30.0
543-28-1
-0.1
501.1
4.7
24.0
544-23
-0.2
606.6
3.2
29.0
542-13
-0.4
1300.3
3.2
27.0
544-16
-0.6
22.5
3.3
31.0
547-11
-1.4
468.6
7.0
29.0
Unfaulted zone
555-16
329.9
311.4
3.6
30.0
546-12
131.5
769.6
6.8
24.0
545-13-2
3.1
207.6
6.4
20.0
541-15
3.0
179.3
16.9
31.0
553-9
2.9
683.8
3.6
28.0
557-9
1.1
1258.4
2.5
23.0
542-12
-0.1
408.2
15.8
27.0
546-13
-0.5
1768.3
4.0
27.0
558-8
-0.6
124.4
3.1
28.0
17-5
-1.2
98.9
16.4
27.0
543-13
-1.2
2815.4
5.4
28.0
549-11
-1.3
224.3
2.8
24.0
Gas concentration of soil gas samples is in ppmv, concentration of absorbed gas is in μl/kg of soil, flux is in mg m-2 day-1, and the temperature is in °C.
