0 引言
1 地质背景
2 样品与实验方法
表1 白家海凸起天然气伴生轻烃主要地球化学参数Table 1 Main geochemical parameters of light hydrocarbons associated with natural gas in Baijiahai Bulge |
| 参数 | C1 s来源天然气 | P2 p来源天然气 |
|---|---|---|
| 庚烷值 | 15.75~32.04 21.05 | 16.52~21.47 21.37 |
| 异庚烷值 | 1.18~2.26 1.58 | 1.44~2.03 1.69 |
| 2-MH+2,3-DMP | 4.04~14.12 8.38 | 1.68~11.91 9.67 |
| 3-MH+2, 4-DMP | 4.18~9.94 6.67 | 14.82~11.32 17.62 |
| K1 | 0.88~1.74 1.25 | 0.40~0.72 0.55 |
| K2 | 0.09~0.29 0.23 | 0.61~0.90 0.75 |
| N2/P3 | 0.84~1.69 1.31 | 0.32~0.47 0.40 |
| P2 | 6.54~20.37 12.17 | 11.05~16.12 13.50 |
| P3 | 9.78~25.60 17.10 | 16.12~22.86 19.24 |
| N2+P2 | 1.43~5.69 3.80 | 11.45~18.22 14.42 |
| 2-MP/3-MP | 1.27~2.59 1.98 | 1.92~2.69 2.33 |
| 2-MH/3-MH | 0.69~1.30 0.98 | 0.91~1.22 1.00 |
| i-C5/n-C5 | 0.49~1.38 0.78 | 0.72~1.21 1.00 |
| 3-MP/n-C6 | 0.01~0.36 0.25 | 0.24~0.37 0.30 |
| 3-MP/Ben | 1.89~7.28 3.26 | 2.70~8.62 5.05 |
| MCH/Tol | 1.11~2.65 1.90 | 1.12~2.11 1.60 |
| n-C7/MCH | 0.38~0.90 0.55 | 0.47~0.89 0.64 |
| Tol/n-C7 | 0.00~0.39 0.11 | 0.00~0.04 0.01 |
|
3 天然气成熟度
4 天然气成因来源
4.1 天然气成因
表2 C4-7主要轻烃化合物名称及缩写Table 2 C4-7 names and abbreviations of main light hydrocarbon compounds |
| 编号 | 名称 | 缩写 |
|---|---|---|
| 1 | 异丁烷 | i-C4 |
| 2 | 正丁烷 | n-C4 |
| 3 | 异戊烷 | i-C5 |
| 4 | 正戊烷 | n-C5 |
| 5 | 环戊烷 | CP |
| 6 | 2,3-二甲基丁烷 | 2,3-DMB |
| 7 | 2-甲基戊烷 | 2-MP |
| 8 | 3-甲基戊烷 | 3-MP |
| 9 | 正己烷 | n-C6 |
| 10 | 甲基环戊烷 | MCP |
| 11 | 苯 | Ben |
| 12 | 环己烷 | CH |
| 13 | 2-甲基己烷 | 2-MH |
| 14 | 3-甲基己烷 | 3-MH |
| 15 | 1,顺,3-二甲基环戊烷 | cis-1,3-DMCP |
| 16 | 1,反,3-二甲基环戊烷 | trans-1,3-DMCP |
| 17 | 1,顺,2-二甲基环戊烷 | cis-1,2-DMCP |
| 18 | 正庚烷 | n-C7 |
| 19 | 甲基环己烷 | MCH |
| 20 | 甲苯 | Tol |
4.2 天然气来源
5 天然气的次生改造作用
5.1 生物降解
图7 运用(a)2-MP/3-MP和2-MH/3-MH;(b)i-C5/n-C5与3-MP/n-C6交会图识别白家海凸起天然气生物降解作用(澳大利亚巴罗岛生物降解原油轻烃数据来自文献[58])Fig.7 Identification of natural gas biodegradation in the Baijiahai Bulge using (a) 2-MP/3-MP and 2-MH/3-MH; (b) i-C5/n-C5 and 3-MP/n-C6 cross-plots (light hydrocarbon data for biodegraded crude oil from Barrow Island, Australia is from Ref.[58]) |
5.2 水洗
图9 运用n-C7/MCH和Tol/n-C7交会图识别白家海凸起天然气蒸发分馏和水洗作用(准噶尔盆地南缘原油轻烃数据来自文献[59]) Fig.9 Identification of evaporative fractionation and water washing of natural gas from the Baijiahai Bulge using n-C7/MCH and Tol/n-C7 crossplot (light hydrocarbon data for fractionationed oil from southern Junggar Basin is from Ref.[59]) |

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