System and method for analyzing light n-alkane components and carbon isotopes in deep and ultra-deep source rock

Patent metadata

Field	Value
Publication number	US-12480919-B2
Application number	US-202218052849-A
Country	US
Kind code	B2
Filing date	Nov 4, 2022
Priority date	Nov 12, 2021
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A method for analyzing light n-alkane components and carbon isotopes in deep and ultra-deep source rocks includes: (S1) subjecting a 5A molecular sieve column to aging; (S2) pyrolyzing a source rock; and allowing a pyrolysis product to enter the 5A molecular sieve column; where n-alkanes are adsorbed and retained by the 5A molecular sieve column; allowing an outflow to pass through a fractionation plate and an empty column or a weak polarity column to be discharged; and (S3) performing programmed heating such that the n-alkanes adsorbed on the 5A molecular sieve column are successively desorbed according to molecular weight, and then pass through the fractionation plate and the HP-5 or DB-5 column to enter a mass spectrometer for composition analysis or isotopic analysis. An analysis system is further provided.

First claim

What is claimed is:

1 . A system for analyzing light n-alkane components and carbon isotopes in deep and ultra-deep source rocks, comprising:
a source rock pyrolysis device; and a column box equipped with a programmable heating system; wherein the column box is provided with a 5A molecular sieve column, a dividing plate, a first chromatographic column, and a second chromatographic column; the pyrolysis device is connected to an inlet of the 5A molecular sieve column, and an outlet of the 5A molecular sieve column is connected with an inlet of the dividing plate; a first outlet of the dividing plate is connected with the first chromatographic column through a first pipeline, and a second outlet of the dividing plate is connected with the second chromatographic column through a second pipeline; and the first outlet of the dividing plate is provided with a first valve, and the second outlet of the dividing plate is provided with a second valve; the first chromatographic column is an empty column or a weak polarity column; and an outlet of the second chromatographic column is connected to a mass spectrometer.

2 . The system of claim 1 , wherein the source rock pyrolysis device is a pyrolysis furnace.

3 . The system of claim 1 , wherein the mass spectrometer is a triple quadrupole mass spectrometer or an isotope ratio mass spectrometer.

4 . The system of claim 1 , wherein an outlet of the first chromatographic column is connected with a blow-down pipe or a flame ionization detector (FID).

Assignees

• Northwest Institute Eco Environment & Resources Cas
• Univ Beijing Jiaotong

Inventors

• Wu Yingqin
• Wang Tong
• Wang Zhiyu
• Ma Rong
• Liu Yan
• Wang Zuodong

Classifications

• G01N2030/8405

  using pyrolysis · CPC title

• G01N2030/025

  Gas chromatography · CPC title

• G01N30/84

  Preparation of the fraction to be distributed · CPC title

• G01N30/80

  Fraction collectors · CPC title

• G01N30/68

  Flame ionisation detectors · CPC title