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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.
The deep oil and gas resources in Nanpu Sag are rich in oil and gas, and the study on hydrocarbon genesis is weak. For the first time, high resolution mass spectrometry (Fourier transform ion cyclotron resonance mass spectrometry (FT -ICR MS) technique was used to study the composition and distribution of the heteroatoms in the crude oil in the Nanpu Sag and its geochemical significance.The nine major combinations of heteroatoms were detected by negative ion ESI FT-ICR MS, N1, N1O1 , N1O2, N1O3, N2, O1, O2, O3 and O4, of which N1, O1 and O2 are ubiquitous and relatively abundant in all samples.The study found that the maturity of N1, O1 carbon in crude oil Number distribution and degree of condensation.It is observed that the relative abundance parameters C16-20 / C21-50-DBE12-N1 and C20 of high and low molecular weight homologues of N1 DBE (equivalent double bond number) = 12,15 -24 / C25-50-DBE15-N1, the condensation degree parameter DBE12 / DBE9-N1 of N1 class and the condensation degree parameter DBE8-9 / DBE4-O1 of class O1 have good correlation with maturity index Ts / Tm and TMNr, They can be used as a measure of the region’s crude oil maturity Indicators reflect the thermodynamics of hydrocarbon evolution.Nanpu sag in different layers of crude oil high-resolution mass spectrometry characteristics are significantly different, indicating that it can be used to identify the nature of maternal rocks.Comprehensive studies suggest that, FT-ICR MS in the maturity evaluation , Oil and gas genesis and identification of oil sources and other aspects of geochemical significance, its theoretical research in the oil and gas and oil and gas exploration has potential applications.