A rapid separation method for pristane diastereoisomers in isoprenoid alkanes

Abstract

The invention relates to a method for rapidly separating pristane diastereoisomers in isoprenoid alkanes. The method is as follows: firstly, a pristane standard product is prepared into a sample with a concentration of 0.05 mg / mL; and then an Agilent 7890 The gas chromatograph is connected to a 7000B triple quadrupole mass spectrometer for GC / MS / MS analysis, each injection volume is 2ul; the chromatographic column uses a 30m×0.32mm×0.25um Rt‑bDEXcst chiral chromatographic column, and the identification of the compound Combined with the characteristic ions of standard samples, relative retention time and NIST 11 spectral library search, a blank sample was inserted between each sample. The present invention is easy to operate, and almost completely achieves the separation of pristane diastereoisomers, thereby ensuring the accuracy of calculating the ratio of biological and geological pristane diastereoisomers, and solving the problem of marine high ‑The difficulty of judging the maturity of over-mature source rocks due to the lack of vitrinite provides technical support for deep-ultra-deep marine oil and gas exploration.

Description

technical field [0001] The invention relates to the technical field of analysis, in particular to a rapid separation method for pristane diastereoisomers in isoprenoid alkanes. Background technique [0002] Due to the lack of vitrinites in the marine high-over-mature source rocks of the Lower Paleozoic in China, its maturity evaluation has become a difficult problem in the current oil and gas exploration process. Pristane in isoprenoid alkanes is a common component in the soluble organic matter of source rocks. The applicant’s previous research found that pristane diastereoisomers (such as figure 1 shown) can be used as a new indicator for judging the high-over-maturity of organic matter (such as figure 2 shown), providing a new way for the research on thermal maturity identification of high-over-mature source rocks. Unfortunately, there is still a lack of effective and rapid separation and detection methods for the diastereomers of isoprenoid alkanes. The conventional se...

AI Technical Summary

Problems solved by technology

Unfortunately, there is still a lack of effective and rapid separation and detection methods for the diastereoisomers of isoprenoid alkanes. The conventional separation and detection still uses ordinary chromatographic columns for separation. The conventional separation effect is not ideal, and the maximum resolution Only 64%, and the analysis needs to be controlled by different temperature programs and complete a sample analysis for at least 198 min

In this way, due to the limitation of separation technology, the separation of pristane diastereoisomers is incomplete, resulting in a certain deviation in the accuracy of the calculation results, and then the evaluation of the maturity of the obtained source rocks will be inaccurate

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