Geochemical characteristics and sources of natural gas in Hangjinqi area of Ordos Basin
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摘要: 为明确鄂尔多斯盆地杭锦旗地区不同区带天然气特征及来源上的差异，通过天然气气体组分分析和碳同位素分析等手段，对杭锦旗地区3个主要勘探区带天然气地球化学组成特征进行了详细的对比剖析，并结合各区带天然气在成藏过程中的差异，对其来源进行了分析探讨。研究区天然气烃类气体含量较高(以甲烷为主)，干燥系数多低于0.95，整体呈现出湿气特征，非烃类气体主要为二氧化碳和氮气，含量较低；天然气碳同位素δ13C1、δ13C2和δ13C3组成表现为正碳序列分布，但不同区带天然气碳同位素组成之间存在着差异，其中什股壕区带天然气δ13C1值最重，而新召区带天然气δ13C2和δ13C3值要明显重于其他2个区带。成因分析结果表明，研究区3个区带天然气均为有机成因气，呈现出煤型气(腐殖型气)的特征，主体为干酪根初次裂解气，且其气源岩处于高成熟—过成熟热演化阶段。结合气源对比结果与地质背景，推测新召区带天然气主要由下伏山西组烃源岩供烃，独贵加汗和什股壕区带天然气则来源于断裂南部太原组和山西组烃源岩的共同贡献，但前者太原组烃源岩贡献比例相对更高。Abstract: In order to clarify the differences of characteristics and sources of natural gas in different zones in Hangjinqi area of Ordos Basin, the geochemical composition characteristics of natural gas in three major exploration zones in Hangjinqi area were compared and analyzed in detail by means of gas composition analysis and carbon isotope analysis, and sources of natural gas in different zones were discussed based on the differences in the process of gas accumulation in different zones. The results show that the natural gas of the study area has a high content of hydrocarbon gases (mainly methane), and the drying coefficients are mostly lower than 0.95, suggest-ing that the natural gas is dominated by wet gases. The non-hydrocarbon gases are mainly carbon dioxide and nitrogen, which have lower contents. The carbon isotopes δ13C1, δ13C2 and δ13C3 of natural gas show a positive carbon series distribution, but there are differences among natural gas carbon isotopes compositions in different zones. The δ13C1 value of natural gas in Shiguhao zone is the heaviest, and the δ13C2 and δ13C3 values of natural gas in Xinzhao zone are significantly heavier than that in the other two zones. The genetic analysis results show that the natural gas in the three regions of the study area is of organic genesis, showing the characteristics of coal-type gas (humus-type gas), and the main body is kerogen primary cracking gas, and the source rocks are in the stage of high-mature to over-mature thermal evolution. Combined with the results of gas-source correlation and geological background, it is inferred that the natural gas in Xinzhao zone is mainly derived from the underlying source rocks of Shanxi Formation, and the natural gas in Duguijiahan and Shiguhao zones is sourced from the source rocks of Taiyuan and Shanxi formations in the southern part of the fault, but Taiyuan source rocks contribute more.
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Key words:
- genetic type /
- gas-source correlation /
- natural gas /
- Hangjinqi area /
- Ordos Basin
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图 1 鄂尔多斯盆地杭锦旗地区位置及采样点分布
据文献[16]修改。
Figure 1. Location of Hangjinqi area in Ordos Basin and distribution of sampling points
图 2 鄂尔多斯盆地杭锦旗地区地层分布
据文献[23]修改。
Figure 2. Stratigraphic distribution of Hangjinqi area in Ordos Basin
图 3 鄂尔多斯盆地杭锦旗地区不同区带天然气组分含量
Figure 3. Component contents of natural gas in different zones of Hangjinqi area in Ordos Basin
图 4 鄂尔多斯盆地杭锦旗地区不同区带天然气干燥系数频数分布直方图
Figure 4. Frequency distribution histogram of drying coefficient of natural gas in different zones of Hangjinqi area in Ordos Basin
图 5 鄂尔多斯盆地杭锦旗地区不同区带烷烃气碳同位素组成特征
Figure 5. Characteristics of alkane carbon isotopic compositions in different zones of Hangjinqi area in Ordos Basin
图 8 鄂尔多斯盆地杭锦旗地区天然气δ13C2与δ13C2－δ13C1相关关系鉴别
根据文献[40]修改。
Figure 8. Identification of correlations between δ13C2 and δ13C2-δ13C1 for natural gas in Hangjinqi area of Ordos Basin
图 10 鄂尔多斯盆地杭锦旗地区天然气烷烃碳同位素气源判识
Figure 10. Gas-source identification in Hangjinqi area of Ordos Basin via alkane carbon isotopes
表 1 鄂尔多斯盆地杭锦旗地区上古生界天然气组分及稳定碳同位素数据
Table 1. Components and stable carbon isotopes of natural gas in Upper Paleozoic in Hangjinqi area of Ordos Basin
区带 井名 层位 组分含量/% C1/ΣC1-5 稳定碳同位素/‰ C1 N2 CO2 δ13C1 δ13C2 δ13C3 什股壕 S1 盒2 89.03 2.62 0.03 0.92 -33.1 -25.5 -24.7 什股壕 S2 盒2 88.57 2.72 0.14 0.92 -33.3 -25.9 -25.2 什股壕 S3 盒3 69.98 23.21 0.01 0.92 -33.4 -25.5 -24.6 什股壕 S4 盒2 71.10 20.44 0.45 0.93 -33.1 -25.5 -24.7 什股壕 S5 盒2/3 87.94 2.20 0.01 0.91 -33.1 -25.4 -24.2 什股壕 S6 盒2 82.17 7.70 0.35 0.92 -33.6 -25.6 -24.3 什股壕 S7 盒2 70.28 21.14 0.37 0.92 -31.3 -25.5 -23.9 什股壕 S8 盒2 64.30 28.60 0.40 0.94 -31.8 -25.6 -24.0 什股壕 S9 盒2 90.64 1.91 0.00 0.94 -33.7 -25.8 -24.6 什股壕 S10 盒2 88.99 2.35 0.10 0.92 -33.7 -26.3 -24.9 什股壕 S11 盒2 89.59 2.05 0.07 0.92 -33.6 -26.5 -25.1 什股壕 S12 盒2 75.62 4.10 0.41 0.82 -32.8 -25.9 -25.2 什股壕 S13 盒2 59.08 33.64 0.28 0.93 -33.4 -26.2 -24.9 什股壕 S14 盒2 67.58 24.16 0.38 0.92 -33.2 -25.5 -24.9 什股壕 S15 盒2 86.19 5.67 0.10 0.91 -33.4 -27.3 -25.6 独贵加汗 D1 盒1/2 92.22 2.02 0.06 0.96 -34.7 -27.7 -25.8 独贵加汗 D2 盒1 81.38 1.09 2.26 0.86 -36.5 -27.8 -26.9 独贵加汗 D3 盒1 90.01 2.06 0.33 0.94 -34.8 -27.3 -26.4 独贵加汗 D4 盒1 76.17 1.57 0.46 0.79 -35.9 -26.5 -26.1 独贵加汗 D5 盒3 92.84 2.23 0.06 0.96 -34.0 -27.3 -24.6 独贵加汗 D6 盒2 90.20 3.90 0.05 0.95 -34.3 -27.9 -25.6 独贵加汗 D7 盒2 89.81 3.38 0.13 0.94 -34.5 -27.7 -25.6 独贵加汗 D8 盒2 92.33 2.59 0.06 0.96 -34.3 -28.2 -25.6 独贵加汗 D9 盒2 86.20 5.39 0.03 0.92 -34.6 -26.4 独贵加汗 D10 盒2 94.55 1.70 0.13 0.97 -34.0 -27.2 -24.4 独贵加汗 D11 盒1 67.38 23.33 0.57 0.91 -33.3 -26.3 -25.5 独贵加汗 D12 盒1 84.53 5.56 0.55 0.93 -32.6 -24.0 独贵加汗 D13 盒1 70.25 21.67 0.57 0.93 -33.1 -24.9 独贵加汗 D14 盒1 84.96 6.67 0.79 0.92 -33.6 -26.9 -24.8 独贵加汗 D15 盒1 83.14 3.99 0.37 0.87 -35.2 -27.5 -27.3 独贵加汗 D16 盒1 80.51 5.88 0.76 0.86 -34.8 -25.6 -25.9 独贵加汗 D17 盒1 79.95 7.58 0.52 0.87 -34.4 -26.0 -25.8 独贵加汗 D18 盒1 74.15 3.19 0.98 0.77 -35.5 -26.1 -26.0 独贵加汗 D19 盒1 86.38 6.09 0.88 0.93 -33.2 -28.1 -26.4 独贵加汗 D20 盒1 86.80 4.86 0.93 0.92 -34.4 -26.6 -25.9 独贵加汗 D21 盒1 85.40 4.45 0.97 0.90 -33.9 -26.3 -25.4 独贵加汗 D22 盒1 88.64 3.74 0.72 0.93 -34.3 -27.2 -25.6 独贵加汗 D23 盒1 84.39 7.74 0.90 0.92 -33.1 -28.1 -27.3 独贵加汗 D24 盒1 87.65 5.25 0.55 0.93 -34.1 -27.0 -25.5 独贵加汗 D25 盒1 89.34 3.55 0.66 0.93 -34.5 -27.0 -25.8 独贵加汗 D26 盒1 89.93 3.74 0.52 0.94 -34.1 -26.6 -24.6 独贵加汗 D27 盒1 89.06 5.03 0.41 0.94 -34.3 -27.4 -25.7 独贵加汗 D28 盒1 85.01 5.05 0.48 0.90 -34.3 -26.4 -25.6 独贵加汗 D29 盒1 83.85 6.80 0.34 0.90 -34.6 -26.6 -25.4 独贵加汗 D30 盒1 88.28 3.81 0.88 0.93 -34.5 -26.6 -25.1 独贵加汗 D31 盒1 84.11 2.98 0.70 0.87 -34.7 -26.8 -26.0 独贵加汗 D32 盒2 57.57 31.78 0.91 0.90 独贵加汗 D33 盒1 81.01 9.02 0.97 0.90 新召 X1 盒1 84.25 1.67 0.71 0.88 -34.6 -24.9 -24.9 新召 X2 盒1 84.19 2.78 0.68 0.89 新召 X3 盒1 81.79 2.84 1.57 0.87 -35.1 -24.0 -24.5 新召 X4 盒1 86.73 2.28 1.13 0.91 -34.4 -24.4 -24.9 新召 X5 盒1 87.12 3.80 0.06 0.92 新召 X6 盒1 85.56 8.16 0.12 0.95 -33.6 -24.4 -23.6 新召 X7 盒1 64.75 22.73 0.54 0.87 新召 X8 盒1 74.26 13.27 0.91 0.90 新召 X9 盒1 80.53 3.33 1.27 0.84 -34.2 -24.2 -23.2 新召 X10 盒1 81.53 2.89 1.66 0.85 -33.8 -23.9 -23.0 新召 X11 盒1 78.56 3.79 2.01 0.83 -34.8 -24.0 -23.9 新召 X12 盒1 79.14 3.74 1.52 0.84 -34.4 -24.2 -24.0 新召 X13 盒1 55.12 32.76 0.85 0.83 新召 X14 盒1 67.06 20.28 1.51 0.86 
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