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Origin and migration model of natural gas in L gas field, eastern slope of Yinggehai Sag, China
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YANG Jihai,HUANG Baojia
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Table 1 Chemical and Carbon isotopic compositions of natural gases from L lithologic gas field.
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| Sample No. | Depth/
m | Formation | Composition of gas /% | C1/C1-5 | δ13C/‰ | RC1/% | RC2/% | | C1 | C2 | C3 | N2 | CO2 | C1 | C2 | C3 | CO2 | | LD01_11 | 3 982 | Huangliu | 81.77 | 2.98 | 0.60 | 6.76 | 7.45 | 0.95 | -32.36 | -23.28 | -19.69 | -11.83 | 1.49 | 1.54 | | LD01_31 | 4 053-4 070 | Huangliu | 68.12 | 1.76 | 0.38 | 5.88 | 23.49 | 0.97 | -31.08 | -23.34 | -20.98 | -0.95 | 1.62 | 1.68 | | LD01_51 | 3 995 | Huangliu | 72.82 | 1.51 | 0.12 | 3.10 | 22.43 | 0.98 | -33.79 | -25.88 | | -1.88 | 1.35 | 1.43 | | LD01_52 | 4 040 | Huangliu | 34.35 | 1.29 | 0.20 | 1.93 | 62.17 | 0.96 | -33.69 | -27.13 | | | 1.36 | 1.44 | | LD01_61 | 4 215 | Huangliu | 49.64 | 1.04 | 0.16 | 5.81 | 43.28 | 0.98 | -29.44 | -23.99 | -19.07 | -9.04 | 1.77 | 1.83 | | LD02_11 | 3 711 | Huangliu | 77.71 | 2.62 | 0.44 | 4.87 | 14.12 | 0.96 | -40.71 | -27.12 | -22.64 | -7.20 | 0.69 | 0.75 | | LD02_12 | 3 856 | Huangliu | 85.37 | 3.90 | 1.41 | 7.53 | 0.52 | 0.94 | -34.04 | -27.27 | -24.84 | -18.08 | 1.33 | 1.37 | | LD02_13 | 4 158 | Meishan | 33.08 | 0.64 | 0.10 | 6.99 | 58.98 | 0.98 | -30.80 | -23.47 | | -1.57 | 1.64 | 1.70 | | LD02_14 | 4 062 | Meishan | 33.17 | 0.35 | 0.04 | 7.54 | 58.84 | 0.99 | -28.79 | -23.78 | | -2.61 | 1.84 | 1.88 | | LD03_11 | 4 106 | Meishan | 47.15 | 0.11 | 0.01 | 5.31 | 47.36 | 0.99 | -27.40 | -20.26 | -18.53 | -1.10 | 1.97 | 2.01 | | LD03_12 | 4 151 | Meishan | 58.88 | 1.34 | 0.36 | 5.59 | 33.30 | 0.97 | -28.67 | -22.63 | -18.91 | -3.63 | 1.85 | 1.90 |
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