System and method for analyzing polycyclic terpane in petroleum geological sample

Abstract

The invention discloses a system and a method for analyzing polycyclic terpane in a petroleum geological sample. The system comprises a central processing unit, a mass spectrograph and a chromatograph, wherein the central processing unit is connected with the chromatograph through the mass spectrograph; the chromatograph comprises a vaporizing chamber and two chromatographic columns with different polarities; the sample enters the two chromatographic columns in turn for separation after passing through the vaporizing chamber in the chromatograph; each separated component substance enters the mass spectrograph in turn to form fragment ions; and the central processing unit qualitatively and quantitatively analyzes the component according to the distribution characteristic of the fragment ions and forms a chromatographic mass spectrum image. In the system and the method, by preferably and effectively combining the two chromatographic columns with different polarities, tricyclic terpenoids, tetracyclic terpenoids and pentacyclic terpenoids in saturated hydrocarbon component of crude oil or rock extract are effectively separated and qualitatively and quantitatively analyzed on the basis of optimized modulation period and analysis conditions.

Description

technical field [0001] The invention belongs to the field of analyzing earth information in petroleum exploration geology, and in particular relates to a system and method for measuring substances in separated crude oil or rock samples. Background technique [0002] Terpenoids are a large class of organic compounds widely distributed in plants, insects and microorganisms. It is an oligomer of isoprene (semiterpene) (its general formula is (C 5 h 8 )n, n=2-8) and their derivatives. So far, a large number of biolipid compounds have been detected in sediments and petroleum. Judging from their composition and content distribution characteristics, the most important type is terpenoids, followed by steroids. Terpenoids include monoterpenes, sesquiterpenes, and di- and triterpenes, among which dicyclic terpenes and above terpenes are collectively referred to as polycyclic terpenes. [0003] For the analysis and detection of terpenoids in petroleum geological samples, the current...

AI Technical Summary

Problems solved by technology

Many high-carbon tricyclic terpenoids (above C29) overlap with tetracyclic and pentacyclic terpenoids, and because of their low abundance, it is difficult for people to accurately identify polycyclic terpenoids And quantitative analysis, some polycyclic terpenes such as gammacerane cannot be completely separated, and the quantitative analysis error is large. At the same time, due to the co-elution of chromatography, some polycyclic terpenes cannot be accurately qualitative, so detailed geochemical analysis cannot be obtained. information

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