Characterization of Crude Oils from Nanpu Depression by High Resolution Mass Spectrometry and Its Geochemical Significance
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摘要: 南堡凹陷深部油气资源丰富, 油气成因研究薄弱.首次采用高分辨质谱(负离子电喷雾离子源(electrospray ionization, 简称ESI)傅里叶变换离子回旋共振质谱(Fourier transform ion cyclotron resonance mass spectrometry, 简称FT-ICR MS)技术对南堡凹陷原油中杂原子化合物的组成与分布特征及其地球化学意义进行了研究.应用负离子ESI FT-ICR MS检测出9种主要杂原子组合类型, 分别为N1、N1O1、N1O2、N1O3、N2、O1、O2、O3和O4类, 其中N1、O1和O2类在所有样品中普遍存在且相对丰度较高.经研究发现成熟度对原油中N1、O1类化合物碳数分布、缩合度有明显的控制作用.实验观察到N1类DBE(等效双键数)=12, 15的高低分子量同系物相对丰度参数C16-20/C21-50-DBE12-N1和C20-24/C25-50-DBE15-N1、N1类缩合度参数DBE12/DBE9-N1及O1类缩合度参数DBE8-9/DBE4-O1与成熟度指标Ts/Tm、TMNr具有良好的相关性, 认为它们可作为该区原油成熟度评价指标, 反映烃类演化的热动力学原理.南堡凹陷不同层系原油高分辨质谱特征有明显差异, 指示其可应用于母源岩性质识别.综合研究认为, FT-ICR MS在成熟度评价、油气成因与油源识别等方面地球化学意义显著, 其在油气地球化学理论研究和油气勘探中具有潜在的应用价值.Abstract: Nanpu depression is abundant in deep oil and gas resources, but the origin of the hydrocarbon is still unclear. High resolution mass spectrometry (negative-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)) is utilized to carry out the composition and distribution of heteroatom compounds of crude oils from the Nanpu depression and its geochemical significance for the first time. The heteroatoms, N1, N1O1, N1O2, N1O3, N2, O1, O2, O3 and O4 class species, were identified by negative-ion ESI FT-ICR MS. And N1, O1, O2 class species are universal in all samples with higher relative abundance. It is found that thermal maturity obviously controls the distribution of carbon numbers and the degree of condensation of N1 and O1 class species. It is observed that parameters like C16—20/C21—50-DBE12-N1, C20—24/C25—50-DBE15-N1, DBE12/DBE9-N1 and DBE8—9/DBE4-O1 have a good correlation with Ts/Tm and TMNr. They could be used as indicators of thermal maturity of crude oils in the depression, reflecting the kinetics of thermal evolution of hydrocarbons. Significant difference was found among different layers of oils detected by negative-ion ESI FT-ICR MS, indicating that it can be applied to characterize source rocks. After a comprehensive investigation, we believe that FT-ICR MS technique is applicable in multiple geochemical aspects, such as maturity level estimation and source rock and relevant hydrocarbons determination. FT-ICR MS is significant in both the compositional characterization of the NSO compounds and the application in petroleum exploration.
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Key words:
- Nanpu depression /
- crude oil /
- high resolution mass spectrometry /
- maturity /
- geochemisitry.
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表 1 南堡凹陷原油色谱、色谱-质谱参数
Table 1. GC and GC-MS parameters of the selected oils from the Nanpu depression
编号 井号 井段(m) 层位 CPI OEP Pr/Ph 20S αββ Ts/Tm Tri-/Pent G/C30H 4-m/C29St C21—22/C27—29St Dia/Reg TMNr 1 G89-4 3385.9~3700.2 Es3 1.09 1.07 1.48 0.57 0.38 0.72 0.119 0.046 0.699 0.046 0.171 0.390 2 GC30-28 3203.0~3666.8 Es3 1.09 1.08 1.36 0.54 0.44 1.33 0.074 0.046 1.117 0.037 0.185 0.419 3 G19 3608.2~4040.8 Es3 1.08 1.05 1.38 0.52 0.47 1.52 0.079 0.048 1.081 0.036 0.206 0.431 4 NP23-P2201 2824.4~3020.0 Ng 1.17 1.03 1.46 0.41 0.36 0.93 0.055 0.145 0.357 0.032 0.186 0.605 5 NP203X1 2595.0~3148.6 Ng 1.14 1.09 1.37 0.46 0.39 0.92 0.088 0.098 0.382 0.033 0.189 0.666 6 NP32-X3212 2700.8~2703.0 Ng 1.14 1.15 1.42 0.54 0.45 1.73 0.052 0.060 0.088 0.032 0.319 0.579 7 NP4-19 1877.0~1879.0 Ng 1.13 1.09 1.48 0.54 0.42 1.38 0.077 0.093 0.335 0.037 0.315 0.667 8 G66-28 2625.0~2634.0 Ed1 1.14 1.05 1.65 0.47 0.39 1.02 0.060 0.066 0.314 0.029 0.285 0.392 9 NP32-X3015 3734.2~3789.8 Ed1 1.17 1.05 1.61 0.57 0.46 1.81 0.057 0.059 0.105 0.036 0.329 0.493 10 B26-2 2294.0~2298.0 Ed1 1.13 1.07 1.61 0.53 0.44 1.75 0.064 0.078 0.307 0.036 0.307 0.533 11 B26-6 2734.0~2909.0 Ed1 1.14 1.08 1.56 0.51 0.44 1.92 0.066 0.081 0.353 0.036 0.345 0.559 12 NP1 2379.8~2410.0 Ed1 1.10 1.01 1.39 0.55 0.42 1.09 0.169 0.275 0.326 0.055 0.237 0.680 13 NP4-31 3932.2~3960.6 Ed2 1.13 1.03 1.48 0.48 0.41 1.08 0.076 0.108 0.356 0.032 0.285 0.567 14 NP280 4575.0~4600.0 O 1.08 1.03 1.34 0.62 0.55 4.94 0.447 0.136 0.460 0.077 0.381 0.766 15 NP23-P2009 5182.7~5452.0 O 1.08 1.08 1.25 0.60 0.53 6.20 0.409 0.158 0.426 0.087 0.388 0.920 16 NP23-P2002 4875.0~5150.0 O 1.07 1.06 1.19 0.60 0.53 7.48 0.40 0.149 0.436 0.085 0.403 0.925 17 PG2 5165.2~5192.0 1.12 1.04 1.69 0.62 0.53 6.31 0.698 0.182 0.094 0.189 0.601 0.953 注:CPI.碳优势指数;OEP.奇偶优势比;Pr/Ph.姥鲛烷/植烷;20S.C29甾烷ααα20S/(S+R);αββ.C29甾烷αββ/(ααα+αββ);Ts/Tm.18α(H)-/17α(H)-三降藿烷;Tri-/Pent.三环萜烷/五环萜烷;G/C30H.伽马蜡烷/C30藿烷;4-m/C29St.4-甲基甾烷/C29规则甾烷;C21—22/C27—29St.C21—22/C27—29甾烷;Dia/Reg.重排甾烷/规则甾烷;TMNr.三甲基萘指数=1, 3, 7-/(1, 3, 7-+1, 2, 5-)三甲基萘. 表 2 南堡凹陷原油负离子ESI FT-ICR MS参数
Table 2. Basic parameters of the oils analyzed by negative-ion ESI FT-ICR MS from the Nanpu depression
编号 井号 层位 含量(%) A B C D N1 N1O1 N1O2 N1O3 N2 O1 O2 O3 O4 1 G89-4 Es3 56.17 4.35 0.0 0.0 0.0 19.26 20.22 0.0 0.0 0.046 0.113 0.720 0.669 2 GC30-28 Es3 63.96 4.81 0.0 0.55 0.0 19.81 10.86 0.0 0.0 0.061 0.142 0.738 0.545 3 G19 Es3 63.59 3.35 0.0 0.0 0.0 17.32 13.38 0.0 2.36 0.085 0.187 0.774 0.651 4 NP23-P2201 Ng 49.60 3.77 2.76 0.0 0.0 28.06 15.81 0.0 0.0 0.054 0.076 0.603 0.422 5 NP203X1 Ng 49.47 2.65 0.0 0.0 0.0 29.32 18.55 0.0 0.0 0.049 0.080 0.784 0.525 6 NP32-X3212 Ng 60.63 3.24 0.50 0.0 0.0 21.42 14.21 0.0 0.0 0.040 0.090 1.021 0.922 7 NP4-19 Ng 56.0 4.21 1.64 0.0 0.0 29.23 8.92 0.0 0.0 0.050 0.098 0.793 0.528 8 G66-28 Ed1 35.52 3.66 2.05 0.33 0.0 35.62 20.38 2.43 0.0 0.020 0.041 0.677 0.284 9 NP32-X3015 Ed1 67.80 4.89 1.84 0.0 0.0 20.14 5.33 0.0 0.0 0.102 0.185 0.927 0.397 10 B26-2 Ed1 49.40 3.51 0.0 0.0 0.0 34.26 12.82 0.0 0.0 0.040 0.059 0.688 0.394 11 B26-6 Ed1 48.66 4.34 0.0 0.0 0.0 36.89 10.11 0.0 0.0 0.054 0.082 0.631 0.413 12 NP1 Ed1 30.95 6.43 4.69 0.0 0.0 12.41 45.52 0.0 0.0 0.064 0.124 0.898 1.084 13 NP4-31 Ed2 44.69 3.26 0.71 0.0 0.0 43.49 7.86 0.0 0.0 0.061 0.079 0.734 0.347 14 NP280 O 77.20 4.92 0.0 0.0 0.55 12.13 5.20 0.0 0.0 0.263 0.469 1.280 1.613 15 NP23-P2009 O 75.14 1.77 0.0 0.0 0.0 18.28 3.89 0.68 0.25 0.129 0.293 1.297 1.649 16 NP23-P2002 O 73.59 3.63 0.0 0.0 0.0 17.82 4.97 0.0 0.0 0.131 0.302 1.265 1.597 17 PG2 31.24 1.31 0.0 0.36 0.0 16.43 39.91 4.99 5.75 0.281 0.462 1.989 2.403 注:A.C16—20/C21—50-DBE12-N1,N1类DBE=12的高低分子量同系物相对丰度参数;B.C20—24/C25—50-DBE15-N1,N1类DBE=15的高低分子量同系物相对丰度参数;C.DBE12/DBE9-N1,N1类缩合度参数;D.DBE8—9/DBE4-O1,O1类缩合度参数. -
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