US 2023/0152285 A1Published application

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

AssigneeNorthwest Institute of Eco-Environment and Resources, Cas

InventorsYingqin WU, Tong WANG, Zhiyu WANG, Rong MA, Yan LIU, Zuodong WANG

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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.

Claims10

Dependent claims

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 fractionation 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 fractionation plate;
a first outlet of the fractionation plate is connected with the first chromatographic column through a first pipeline, and a second outlet of the fractionation plate is connected with the second chromatographic column through a second pipeline;
and the first outlet of the fractionation plate is provided with a first valve, and the second outlet of the fractionation plate is provided with a second valve;
the first chromatographic column is an empty column or a weak polarity column;
the second chromatographic column is HP-5 column or DB-5 column;
and
an outlet of the second chromatographic column is connected to a mass spectrometer.

8 more elements

A method for analyzing light n-alkane components and carbon isotopes in deep and ultra-deep source rocks, comprising:

(S1) subjecting a 5A molecular sieve column to aging;
(S2) subjecting a source rock to pyrolysis to obtain a pyrolysate, and allowing the pyrolysate to pass through the 5A molecular sieve column, wherein n-alkane components in the pyrolysis product are adsorbed by the 5A molecular sieve column and retained in the 5A molecular sieve column;
allowing an outflow from the 5A molecular sieve column to pass through a fractionation plate;
opening a first valve to allow the outflow to flow through an empty column or a weak polarity column;
and continuing to perform helium purging until the source rock is completely pyrolyzed and the pyrolysis product other than the n-alkane components is completely purged;
and
(S3) turning on a programmable heating system to subject the 5A molecular sieve column and a HP-5 chromatographic column to programmed heating, wherein the n-alkane components adsorbed on the 5A molecular sieve column are successively desorbed according to molecular weight and boiling point;
and allowing the n-alkane components to pass through the fractionation plate and the HP-5 chromatographic column for separation, and to enter a mass spectrometer for composition analysis or carbon isotopic analysis.

5 more elements

Dependencies are inferred from the claim text.