0 引言
1 地质背景
2 实验样品和分析测试方法
表1 川东北五宝场地区须家河组和沙溪庙组天然气组分、碳氢同位素数据Table 1 Natural gas composition and hydrocarbon isotope data of Xujiahe Formation and Shaximiao Formation in Wubaochang area, Northeast Sichuan |
序号 | 井号 | 层位 | 天然气主要组分/% | C1/C1-4 | δ13C/‰ | δ2H/‰ | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CH4 | C2H6 | C3H8 | iC4H10 | nC4H10 | N2 | CO2 | CH4 | C2H6 | C3H8 | CH4 | ||||
1 | WBQ20 | 须五段 | 97.08 | 0.90 | 0.09 | 0.00 | 0.01 | 0.69 | 1.05 | 0.990 | -32.5 | -30.0 | -168 | |
2 | WBQ15 | 须四段—须六段 | 97.58 | 1.42 | 0.13 | 0.01 | 0.01 | 0.26 | 0.55 | 0.984 | -33.9 | -25.4 | -167 | |
3 | WBQ6-1 | 沙二段 | 94.50 | 3.05 | 0.59 | 0.09 | 0.17 | 1.15 | 0 | 0.960 | -32.6 | -29.8 | -28.1 | -174 |
4 | WBQ10 | 沙二段—遂宁组 | 93.93 | 3.35 | 0.79 | 0.14 | 0.22 | 1.23 | 0 | 0.954 | -33.5 | -29.5 | -27.1 | -177 |
5 | WBQ13 | 沙二段 | 94.55 | 3.22 | 0.78 | 0.15 | 0.21 | 0.69 | 0 | 0.956 | -34.2 | -29.3 | -26.7 | -177 |
6 | WBQ9 | 沙二段 | 93.92 | 3.45 | 0.81 | 0.15 | 0.23 | 1.05 | 0 | 0.953 | -33.4 | -28.2 | -25.9 | -178 |
7 | WBQ1 | 沙二段 | 93.65 | 3.61 | 0.89 | 0.17 | 0.26 | 0.85 | 0 | 0.950 | -34.0 | -28.2 | -26.5 | -178 |
8 | WBQ1-2 | 沙二段 | 93.82 | 3.62 | 0.91 | 0.18 | 0.26 | 0.73 | 0 | 0.950 | -34.1 | -29.8 | -26.9 | -179 |
9 | WBQ1-1 | 沙二段 | 93.20 | 3.60 | 0.8 | 0.15 | 0.24 | 1.43 | 0 | 0.951 | -32.6 | -29.8 | -27.5 | -185 |
10 | WBQ4-1 | 沙二段 | 94.29 | 3.08 | 0.69 | 0.13 | 0.20 | 1.17 | 0 | 0.958 | -33.4 | -27.5 | -25.7 | -178 |
11 | WBQ006-1-H1 | 沙一段 | 93.54 | 3.39 | 0.68 | 0.10 | 0.21 | 1.58 | 0 | 0.955 | -32.1 | -29.5 | -27.7 | -183 |
3 实验结果与讨论
3.1 天然气组成
图3 四川盆地须家河组、沙溪庙组天然气甲烷含量与干燥系数关系(川中、元坝、通南巴须家河组以及川东长兴—飞仙关组数据引自文献[12],[15-17],[32-35])Fig.3 Relationship between methane concentration and drying coefficient in natural gas of Xujiahe Formation and Shaximiao Formation in Sichuan Basin(data of Xujiahe Formation in Central Sichuan, Yuanba, Tongnanba area and data of Changxing-Feixianguan Formation in east Sichuan from references[12],[15-17],[32-35]) |
3.2 天然气碳同位素
图4 四川盆地天然气甲烷与乙烷碳同位素关系(川中、元坝、通南巴须家河组以及川东长兴组—飞仙关组数据引自文献[12],[15-17],[32-35])Fig.4 Carbon isotope relationship between methane and ethane in Sichuan Basin(data of Xujiahe Formation in Central Sichuan, Yuanba, Tongnanba area and data of Changxing-Feixianguan Formation in east Sichuan from references[12],[15-17],[32-35]) |
图5 四川盆地天然气甲烷碳同位素与干燥系数关系(川中、元坝、通南巴须家河组以及川东长兴组—飞仙关组数据引自文献[12],[15-17],[32-35])Fig.5 Relationship between methane carbon isotope and drying coefficient of natural gas in Sichuan Basin(data of Xujiahe Formation in Central Sichuan,Yuanba,Tongnanba area and data of Changxing-Feixianguan Formation in east Sichuan from references[12],[15-17],[32-35]) |
3.3 天然气氢同位素
图6 四川盆地天然气乙烷碳同位素与甲烷氢同位素关系(川中、元坝、通南巴须家河组以及川东长兴组—飞仙关组数据引自文献[12],[15-17],[32-35])Fig.6 Relationship between ethane carbon isotope and methane hydrogen isotope of natural gas in Sichuan Basin(data of Xujiahe Formation in Central Sichuan,Yuanba,Tongnanba area and data of Changxing-Feixianguan Formation in east Sichuan from references[12],[15-17],[32-35]) |
3.4 天然气轻烃
图7 四川盆地须家河组及长兴组天然气轻烃组成色谱Fig.7 Chromatogram of light hydrocarbon composition of Xujiahe Formation and Changxing Formation natural gas in Sichuan Basin |