Research Article
Methane in Soil Gas and Its Migration to the Atmosphere in the Dawanqi Oilfield, Tarim Basin, China
Table 2
Molecular and isotopic composition of soil gas samples.
| | Sites | CH4 | C2H6 | C3H8 | i-C4H10 | n-C4H10 | i-C5H12 | n-C5H12 | δ13CCH4 | δ13CCO2 | δDCH4 |
| | Faulted zones | 18-7 | 1148.5 | 93.7 | 36.3 | 8.9 | 10.4 | 6.5 | 4.3 | na | na | na | | 19-4 | 2576.9 | 123.9 | 40.8 | 10.4 | 9.9 | 4.0 | 1.4 | na | na | na | | 541-14 | 824.7 | 81.1 | 19.9 | 5.4 | 6.0 | 6.3 | 4.1 | na | na | na | | 542-13 | 1300.3 | 84.0 | 20.3 | 5.0 | 5.7 | 2.6 | 1.5 | -11.3 | -15.5 | -162 | | 545-12 | 1834.1 | 198.1 | 33.6 | 9.8 | 8.5 | 2.6 | 2.0 | na | na | na | | 547-11 | 468.6 | 27.8 | 11.3 | 2.8 | 3.6 | 1.7 | 1.2 | na | na | na | | 556-10 | 160.2 | 12.2 | 5.1 | 1.2 | 1.4 | 0.0 | 0.0 | na | na | na | | 559-8 | 323.5 | 11.4 | 3.8 | 0.7 | 0.9 | 0.0 | 0.0 | na | na | na | | 554-15 | 2631.0 | 186.2 | 70.9 | 18.5 | 19.6 | 9.6 | 5.8 | -13.5 | -17.2 | -150 | | 554-14 | 904.1 | 55.5 | 21.0 | 5.2 | 5.5 | 3.7 | 2.4 | na | na | na | | 554-11 | 598.3 | 37.1 | 13.1 | 3.1 | 3.2 | 1.4 | 0.0 | na | na | na | | 544-23 | 606.6 | 53.2 | 24.6 | 5.8 | 7.7 | 3.4 | 2.4 | na | na | na | | 546-20 | 1164.0 | 44.5 | 11.9 | 8.0 | 8.0 | 2.8 | 1.6 | na | na | na | | 544-16 | 22.5 | 1.8 | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | na | na | na | | 543-28-1 | 501.1 | 24.6 | 8.9 | 2.0 | 2.2 | 0.8 | 0.6 | na | na | na | | 543-28-2 | 1011.1 | 56.3 | 19.0 | 4.2 | 3.2 | 2.1 | 1.4 | na | na | na | | 543-28-3 | 2228.0 | 122.6 | 32.5 | 7.5 | 8.6 | 4.2 | 2.8 | na | na | na | | 543-28-4 | 967.1 | 68.6 | 16.3 | 4.0 | 3.7 | 2.0 | 1.7 | na | na | na | | 543-28-5 | 988.1 | 55.6 | 14.9 | 4.0 | 3.2 | 1.7 | 0.7 | na | na | na |
| | Unfaulted zones | 17-5 | 98.9 | 8.1 | 3.5 | 1.0 | 1.4 | 0.0 | 0.0 | na | na | na | | 543-13 | 2815.4 | 176.7 | 63.4 | 15.9 | 17.6 | 8.6 | 5.0 | -19 | -16.4 | -175 | | 545-13-1 | 221.6 | 14.3 | 5.3 | 1.3 | 1.5 | 0.0 | 0.0 | na | na | na | | 545-13-2 | 207.6 | 13.3 | 4.3 | 1.4 | 1.1 | 0.0 | 0.0 | na | na | na | | 546-12 | 769.6 | 53.8 | 20.8 | 5.4 | 6.0 | 3.6 | 2.1 | na | na | na | | 549-11 | 224.3 | 15.1 | 5.6 | 1.4 | 1.4 | 0.0 | 0.0 | na | na | na | | 550-10 | 1117.1 | 66.3 | 24.0 | 6.8 | 6.5 | 58.0 | 1.8 | -17.1 | -17.1 | -177 | | 551-10 | 1863.8 | 109.0 | 37.7 | 9.6 | 10.0 | 5.0 | 3.3 | -15.1 | -16.3 | -152 | | 552-10 | 2614.1 | 155.8 | 51.2 | 12.8 | 12.5 | 6.3 | 3.5 | -14.9 | -16.7 | -189 | | 553-9 | 683.8 | 47.5 | 18.1 | 4.5 | 5.1 | 2.5 | 1.6 | na | na | na | | 554-9 | 317.3 | 14.7 | 4.9 | 1.0 | 1.1 | 0.0 | 0.0 | na | na | na | | 557-9 | 1258.4 | 90.3 | 39.0 | 5.0 | 11.7 | 4.0 | 9.2 | -17.7 | -16.3 | -166 | | 558-8 | 124.4 | 14.4 | 7.0 | 1.1 | 2.2 | 0.0 | 0.0 | na | na | na | | 559-7 | 65.4 | 2.8 | 1.4 | 0.0 | 0.0 | 0.0 | 0.0 | na | na | na | | 546-13 | 3333.6 | 159.4 | 49.4 | 11.1 | 13.0 | 5.2 | 4.4 | na | na | na | | 555-20 | 99.6 | 60.0 | 20.7 | 5.2 | 5.0 | 2.4 | 1.3 | -14.7 | -16 | -166 | | 555-18 | 3716.4 | 179.1 | 56.4 | 14.7 | 14.8 | 7.4 | 4.1 | na | na | na | | 555-16 | 311.4 | 27.2 | 9.2 | 2.4 | 2.6 | 1.3 | 0.0 | na | na | na | | 555-13 | 322.4 | 37.5 | 17.7 | 3.4 | 5.8 | 1.9 | 1.8 | na | na | na | | 553-10 | 896.1 | 48.3 | 17.0 | 4.1 | 4.1 | 2.5 | 1.8 | na | na | na | | 553-7 | 75.6 | 5.1 | 2.3 | 0.0 | 0.5 | 0.0 | 0.0 | na | na | na | | 542-26 | 620.0 | 43.8 | 9.7 | 2.5 | 2.6 | 1.3 | 0.0 | na | na | na | | 543-25 | 159.2 | 18.7 | 6.8 | 1.8 | 2.2 | 1.4 | 0.0 | na | na | na | | 545-21 | 617.1 | 77.1 | 44.5 | 12.3 | 16.8 | 7.7 | 6.1 | na | na | na | | 545-20 | 876.4 | 88.9 | 42.1 | 8.8 | 14.1 | 5.7 | 7.9 | na | na | na | | 546-19 | 136.8 | 9.8 | 3.8 | 1.0 | 1.0 | 0.0 | 0.0 | na | na | na | | 544-18 | 447.5 | 126.6 | 69.7 | 7.0 | 3.2 | 5.8 | 10.8 | na | na | na | | 544-17 | 421.8 | 32.2 | 15.5 | 3.8 | 4.9 | 2.5 | 1.7 | na | na | na | | 543-16 | 383.0 | 39.9 | 12.0 | 3.1 | 3.8 | 2.0 | 1.2 | na | na | na | | 541-15 | 179.3 | 22.5 | 9.1 | 1.9 | 3.1 | 1.5 | 1.2 | na | na | na | | 542-12 | 408.2 | 38.3 | 17.6 | 3.8 | 5.7 | 2.4 | 1.8 | na | na | na | | 542-26-2 | 620.0 | 43.8 | 9.7 | 2.5 | 2.6 | 1.3 | 0.0 | na | na | na |
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Gas composition is in ppmv. Isotopic data: δ13C: ‰ VPDB; δD: ‰ VSMOW. na: not analyzed.
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