Curve-Fitting Analysis of Micro FT-IR and Its Application on Individual Oil Inclusion and Micro-Area Bitumens
Wang Qianru
Chen Honghan
Hu Shouzhi
Zhao Yutao
Chen Huiqin
Abstract：Curve-fitting analysis of micro FT-IR,in the theory of Gaussian,Lorentz function or their combination (Gaussian-Lorentz)model,can break through the limit of overlapping spectra resulting from complicated structures of samples (e.g.indi-vidual oil inclusion and bitumens).Hence,curve-fitting analysis of micro FT-IR was used for analyzing maturity of individual oil inclusion and the origin of bitumens in Shuntuoguole area of Tazhong northeastern slope systematically,and four conclusions have been obtained:firstly,curve-fitting analysis of micro FT-IR may be more accurate for calculating absorption peaks,and some easily neglected peaks can be detected by this method in contrast with the method of interval oriented by Pironon.Second-ly,Gaussian-Lorentz fitting is more approaching to actual spectra and the lower noise level is corresponding to better fit but re-quiring longer computation time.As a result,Gaussian-Lorentz fitting with 1~10 noise level is preferred.Thirdly,based on in-clusion system analysis and burial history projection with homogenization temperature,infrared parameters (e.g.CH2a/CH3a, Xinc and Xstd)reveal three hydrocarbon charging events occurred,including Late Caledonian,Late Hercynian and the Himala-ya.Finally,micro FT-IR is an effective means for analyzing multi-hydrocarbon charging events and complicated origin of bitu-mens undergoing biodegradation,oxidative degradation and water eluviation quantitatively in study area.
Keywords：micro FT-IRcurve-fitting analysisindividual oil inclusionmicro-area bitumenthe SilurianTarim basinpetro-leum geology.
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 1921-1934 )