261 results about "Isotope analysis" patented technology

Method and apparatus for providing real-time data indicative of the isotopic composition of formation fluids during drilling. The method includes the steps of: (a) providing a reference fluid having a known isotopic composition in a reference cell; (b) capturing a sample of formation; (c) providing at least one laser beam; (e) passing a beam through the reference fluid, measuring the reference-measurement beam before and after it passes through the reference fluid; (f) and passing a beam through the sample, measuring the beam before and after it passes through the sample, and calculating a first isotope concentration from those measurements. The measurements can provide information relating to the carbon isotopic composition of individual compounds in hydrocarbon gas mixtures, with the individual compounds including methane, ethane, propane, iso- or normal butane, or iso- or normal pentane.

Method and apparatus for providing real-time data indicative of the isotopic composition of formation fluids during drilling. The method includes the steps of: (a) providing a reference fluid having a known isotopic composition in a reference cell; (b) capturing a sample of formation; (c) providing at least one laser beam; (e) passing a beam through the reference fluid, measuring the reference-measurement beam before and after it passes through the reference fluid; (f) and passing a beam through the sample, measuring the beam before and after it passes through the sample, and calculating a first isotope concentration from those measurements. The measurements can provide information relating to the carbon isotopic composition of individual compounds in hydrocarbon gas mixtures, with the individual compounds including methane, ethane, propane, iso- or normal butane, or iso- or normal pentane.

The invention provides a method for generating a dolomite reservoir geochemical plate. The method comprises the following steps: selecting a dolomite sample according to a core structure, and preparing the selected dolomite sample into sample pieces; carrying out electronic probe microanalysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth element analysis on thesample pieces to generate analysis data; determining the genetic type of the dolomite reservoir according to the sample pieces; and generating a geochemical plate according to the analysis data and the genetic type. By utilizing the dolomite reservoir geochemical plate in the invention, the genetic type of the dolomite reservoir can be accurately and rapidly identified; compared with the traditional method, the genesis of the reservoir is more accurate and reliable, and the reservoir formation mechanism and master control factors can be known deeply.

The invention relates to a method for analyzing carbon isotopes of micro single hydrocarbons in natural gas. The method is characterized by utilizing a divinyl benzene / carbon molecular sieve / polydimethylsiloxane (DVB / CAR / PDMS) composite adsorbing material to enrich the microcomponents in the hydrocarbons, carrying out thermal desorption at the gas chromatography injection port and carrying out separation through gas chromatography and analyzing the carbon isotopes of the single hydrocarbons by isotope ratio mass spectrometry. The method has the following beneficial effects: the method has the advantages of high carbon isotope testing precision and good repeatability, conforms to the research needs, is simple to operate and has good use and popularization values.

The invention relates to a device for purifying and enriching inert gases and a use method. On the basis of an inert gas isotopic analysis technique, a Zr-based getter material capable of working at a room temperature is used in the invention, and meanwhile, a sample quantitative control system and a 15K low temperature cold trap are additionally arranged. All function parts are reasonably arranged and matched in the device so as to make a system have dynamic high vacuum (5.0*10-8Pa) and low leakage rate. A trace of inert gases in a single gas sample can be purified and enriched in 10 minutes. The quantitative analysis of the contents of inert gases He, Ne, Ar, Kr and Xe in the gas sample is conducted by a four-pole mass spectrometer. Meanwhile, one-step sample purification is realized, all components of the inert gases are chilled and enriched by the low temperature activated carbon cold trap (15K), and the inert gases He, Ne, Ar, Kr and Xe are gradually released in a gradual heating way. The invention lays a foundation for conducting isotopic analysis on all components of the inert gases.

The invention provides a thermal ionization time-of-flight mass spectrometer and a thermal ionization time-of-fight mass spectrometric analysis method, and belongs to the technical field of mass spectrometric analysis. The thermal ionization time-of-flight mass spectrometer is mainly composed of an ion source, an ion transmission system and a vertical reflection type time-of-flight mass analyzer. The thermal ionization time-of-flight mass spectrometer is used, an analysis sample is arranged in the ion source and fixed on a filament band on a sample frame, currents of the filament band are increased to enable the sample to be ionized, ion beams are transmitted and modulated by an ion transmission lens assembly in the ion transmission system and reach the vertical reflection type time-of-flight mass analyzer, ions with different masses reach a detector after different flight time, and the qualitative and quantitive analysis or the isotope analysis of the sample is achieved. According to the thermal ionization time-of-flight mass spectrometer and the thermal ionization time-of-fight mass spectrometric analysis method, isotope abundance can be quickly and accurately measured, impurity elements are monitored, and an innovative mass spectrometric analysis technology is achieved.

The invention provides a method for solving the collinearity problem in the process of analyzing the source of air particulate matters, which comprises the following steps: firstly, collecting an ambient air particulate matter sample and a pollution source sample, and performing stable carbon isotope analysis on the collected samples; secondly, reconstructing a stable carbon isotope mass balance model of three pollution sources including automotive vehicle tail gas and dust, coal soot, and soil wind dust and sand which have collinearity through analyzing the component characteristics of stable isotopes of a total carbon in the pollution sources and the ambient air particulate matters; and thirdly, analyzing the contribution of the three pollution sources to the ambient air particulate matters. The isotope mass balance model is the development of a chemical mass balance receptor model, and solves the difficult problem of one set of data with various results encountered by singly using a chemical mass balance to analyze the source of the air particulate matters.

The invention belongs to the field of oil-gas-bearing system research and particularly provides a Re-Os isotope analysis method for oil and gas system organic matter research. The method includes the following steps of sample pretreatment, Re-Os separation, Re purification, Os purification and Re and Os isotope detection. A sample is high-evolution organic matter, preferably high-evolution organic-matter-rich sedimentary rock or high-evolution formation asphalt. The method is especially suitable for hydrocarbon source comparison and reservoir forming geochronology research under the organic matter high-evolution condition. According to the method, the high-evolution organic matter sample is fully dissolved, Re and Os elements are effectively separated and purified, accurate Re-Os isotope data of the high-evolution sample is acquired, the reservoir forming geochronology and hydrocarbon sources are determined based on the data, and a reference basis is provided for finding out the formation process of natural gas reservoirs or fossil oil reservoirs or other oil and gas systems and guiding exploration.

The invention relates to a method for measuring the hydrogen isotope ratio of ethanol in grape wine and belongs to the technical field of stable isotope analysis. The method comprises the steps that (1) hydrogen isotope is used for forming a known to-be-tested water treatment sample; (2) acetone is used for diluting a fermentation ethanol sample treated by water, and the mixture is mixed for use; (3) a liquid sample injection needle is used for sample injection, and gas chromatography equipped with a molecular sieve capillary chromatographic column is used for separating ethanol, acetone, water and other hydrogen compounds; (4) an on-line cracking device is used for converting ethanol into hydrogen; (5) CF-IMRS is used for measuring the hydrogen delta D produced by the ethanol; (6) correction computation of delta DSMOW of sample ethanol is performed according to the delta D measured value of an ethanol isotopic reference material. According to the method for measuring the hydrogen isotope ratio of ethanol in grape wine, GC-TC-IRMS is used for measuring the hydrogen isotopic compositions of the fermentation ethanol, and the technical difficulty of series of pretreatment of ethanol purification before measurement of fermentation ethanol hydrogen isotope in the past is solved; advance of the ethanol hydrogen isotope measurement technology can be promoted, and a technical method is provided for source identification of fermentation ethanol, sugar mixing detection of a plant source product and study of metabolic pathways in future.

The invention relates to a rapid determination method for oxygen stable isotope of ethanol in an alcoholic beverage, and belongs to the technical field of stable isotope analysis. The method comprises the following steps: 1) using acetone to dilute an alcoholic beverage, and mixing for stand-by; 2) injecting a sample by a liquid injection needle, and using a GC with molecular sieve chromatographic capillary column to separate ethanol, acetone, water and other oxygen-containing compounds; 3) converting ethanol into CO with an on-line pyrolysis device; 4) determining delta 18O in CO produced by ethanol by CF-IRMS; and 5) based on a measured delta 18 O value of an isotopic reference material, correcting and calculating delta 18OVSMOW of the ethanol sample. The invention utilizes GC-TC-IRMS to realize rapid determination of oxygen stable isotope of ethanol in alcoholic beverage, and solves series of existing technical problems in pretreatment, such as ethanol purification before determination of oxygen stable isotope of alcohol in alcoholic beverage. The project can promote technological progress of ethanol oxygen isotope determination, and also provides technical methods for the future research on authentication and metabolic path of alcoholic beverage or biofuel.

The invention belongs to the technical field of analysis methods for natural gas and especially relates to a carbon isotope analysis method for a series of hydrocarbon compounds in natural gas. The method comprises the following steps: step A, carrying out solid-phase micro-extraction enrichment on a series of hydrocarbon compounds in natural gas; step B, separating the hydrocarbon compounds and carrying out qualitative analysis on unknown hydrocarbon compounds; and step C, carrying out carbon isotope determination on the hydrocarbon compounds. According to the invention, solid-phase micro-extraction technology is introduced into a natural gas isotope analysis method and combined with a GC-IRMS analysis system, influence of factors like equilibrium time and equilibrium temperature on difference of adsorption capability of the hydrocarbon compounds and on carbon isotope values are analyzed, and operation conditions are optimized, so effective enrichment and carbon isotope composition analysis of the series of hydrocarbon compounds in natural gas are realized. The method provided by the invention can realize rapid and effective enrichment and carbon isotope composition analysis of the series of hydrocarbon compounds in natural gas.

The invention provides a method for detecting a seeping water source of an underground workshop of a pumped storage power station based on an isotope tracer technique. The method comprises the following steps: according to the overall structures of the underground workshop and an upper reservoir, collecting water samples from a measuring weir of the underground workshop, in-reservoir water, seepage around a dam of the upper reservoir, underground water, a gentle slope and the surrounding of the reservoir; analyzing radon isotopes in the water samples, at the same time, relatively analyzing theconcentration of hydrogen and oxygen isotopes, chloride ions, sulfate ions and nitrate ions in the water samples, wherein detection results of the concentration of the chloride ions, the sulfate ionsand the nitrate ions are up to the time point of half a year; analyzing all the contents in order to more comprehensively evaluate the seeping water source. The principle of fractional distillation of water isotopes is adopted for investigating a water supply source and distinguishing the composition of underground water from different sources in seeping water, which has a critical function in accurately understanding a seepage field of the dam and determining whether a seepage channel around the dame exists.

The invention relates to an on-line logging method for methane carbon isotopes. According to the method, drilling fluid, a drilling fluid degasser, a gas circuit pipeline, a gas purification module, a pressure control module, a flow control module, a carrier gas generation module, carrier gas, a flow controller and a methane carbon isotope analysis module are included, wherein the drilling fluid is introduced into the drilling fluid degasser and degassed to generate drilling fluid gas; the drilling fluid gas is delivered to the gas purification module through the gas circuit pipeline; the gas purification module, the pressure control module and the flow control module are connected through a gas pipeline; a carrier gas generator is connected with the flow controller through the gas pipeline; and under the action of the carrier gas and under the control of the flow control module and the flow controller, the drilling fluid gas is analyzed by the methane carbon isotope analysis module to get relative content of methane and methane carbon isotope data. The invention discloses an on-line portable carbon isotope analysis method, so that reference is provided for quickly evaluating oil gas on site.

The invention discloses a system and a method for preparing carbon dioxide gas needed by carbonate coupled isotope analysis. The system comprises a reaction unit, a purification unit, a collection unit, a vacuumizing unit and a heating device, wherein the reaction unit comprises at least one carbon dioxide gas reaction generation device for generating carbon dioxide gas; the purification unit comprises a cold trap assembly for freezing and collecting the carbon dioxide gas generated by the carbon dioxide gas reaction generation device and removing moisture and organic hydrocarbon impurities from the carbon dioxide gas; the collection unit comprises at least one gas collecting device for collecting carbon dioxide gas purified by the purified unit; the heating device is used for heating connecting pipelines of the reaction unit, the purification unit and the collection unit and is further used for heating the purification unit.

A mass spectrometer for analyzing isotopic signatures, with at least one magnetic analyzer and optionally with an electric analyzer as well, with a first arrangement of ion detectors and / or ion passages and, arranged downstream thereof in the direction of the ion beam, a second arrangement of ion detectors, with at least one deflector in the region of the two arrangements of ion detectors or between these arrangements. Additionally, a multi-collector arrangement, special uses and a method for analyzing isotopes in a sample. The mass spectrometer according to the invention has a control for the at least one deflector such that ion beams of different isotopes can be routed to at least one ion detector in the second arrangement.

The invention discloses an on-site shale gas desorption analyzer. The on-site shale gas desorption analyzer disclosed by the invention is compact in overall structure and low in experimental environment requirements and is applied to convenient on-site testing of a vehicle-mounted room or simple room nearby a well site. The analyzer is low in power, and power of the analyzer can be supplied by a generator or supplied conventionally. According to the set of instrument, the content of gas of a shale gas site can be tested, the content of gas of tight gas reservoir, coal bed gas and other site rock cores also can be tested, and the accuracy is high. According to the well site customer test requirements, the rapid site shale gas desorption analyzer can be connected with an on-line gas analyzer, and gas components and change in the shale gas desorption process can be synchronously analyzed. The components of the shale gas can be rapidly determined, and the degassing rule can be researched. The on-site shale gas desorption analyzer is equipped with a rapid gas sample production joint, and the gas separated from rock core samples can be conveniently collected to be used for subsequent accurate testing and analysis in a lab, such as gas component analysis and gas isotope analysis in the lab.

The invention provides a method for tracing pollutants by combining nitrogen oxygen isotopes with three-dimensional fluorescence. The method comprises the following steps of isotope determination andanalysis, fluorescence detection and analysis, pollution source type recognition and pollution source determination. According to the method for tracing the pollutants, main pollution sources and thecontribution rate of the pollution sources are determined by using nitrogen oxygen isotope analysis; the fluorescence ratio among various fluorescence peaks is determined by fluorescence detection, sothat the main pollution sources and the fluorescence ratio are combined to judge the pollution source types of sampling points; main sources of pollutants at various sampling points are determined bycombining with geographic location, hydrologic parameters and the pollution source types, so as to effectively improve the reliability and the accuracy of tracing the pollution sources.

The invention discloses a method for comprehensively recognizing sedimentation hiatal surfaces in an ultra-thick seam. The sedimentation hiatal surfaces in the ultra-thick seam are comprehensively recognized according to five parameters acquired through coal petrography and coal quality analysis, microelement analysis, organic matter stable carbon isotope analysis, one-dimensional continuous wavelet transformation of log data and Milankovitch cycle analysis of the log data; growth control factors of the sedimentation hiatal surfaces are explained from the origin essentially through recognition of Milankovitch cycles in the ultra-thick seam, the root cause of growth of the sedimentation hiatal surfaces is found out, and the accuracy and the credibility of the sedimentation hiatal surfaces are greatly improved. Besides, weight scoring is performed according to sensitivity of different recognition methods, the recognized sedimentation hiatal surfaces are correspondingly assigned, the scores obtained with all the methods are added up, and the reliability of the sedimentation hiatal surfaces is described quantitatively. The recognition method is convenient and flexible and has better practicability.

The invention provides a method for measuring a uranium isotope ratio in single particles. The method comprises the following steps: S1, preparing a uranium-containing particle sample; S2, searching and identifying uranium-containing particles in the uranium-containing particle sample by utilizing a scanning electron microscope and an X-ray energy dispersive spectrometer; S3, after finding out the uranium-containing particles, transferring the uranium-containing particles onto a sample belt by utilizing a microoperation system; S4, carrying out isotope analysis on the sample belt by utilizing a thermal ionisation mass spectrometer and obtaining the uranium isotope ratio in the uranium-containing particles. Compared with the prior art, the method for measuring the uranium isotope ratio in the single particles, provided by the invention, does not need to carry out irradiation, cooling and etching, can greatly shorten the measurement period of particle analysis and improves analysis efficiency.

The invention relates to a nanoscale unconventional reservoir rock adsorption gas extracting device and an extraction and hydrocarbon analysis method. The extraction and hydrocarbon analysis method is characterized by comprising the following steps: (1) closely smashing an unconventional rock core until the particle size is in a nanoscale to obtain nanoscale samples; (2) obtaining a nanoscale rock adsorption gas sample by adopting a nanoscale rock adsorption gas extracting device and an operating method; (3) acquiring hydrocarbon analysis data of nanoscale rock adsorption gas by adopting a packed column gas chromatography detection method; (4) acquiring a nanoscale rock adsorption gas hydrocarbon component carbon isotope analysis result by using a hydrocarbon component carbon isotope detection method; (5) carrying out quantitative calculation by adopting an external standard method for acquiring analysis results of hydrocarbon components and the total hydrocarbon quantity; and (6) calculating to obtain analysis evaluation parameters of the rock nanoscale adsorption gas. The nanoscale unconventional reservoir rock adsorption gas extracting device and the extraction and hydrocarbon analysis method can reflect the gas condition of an unconventional reservoir and provide experimental technique supports for the gas-containing evaluation and the exploration and development of the unconventional reservoir.

The invention relates to a gas sample introduction device. The gas sample introduction device can perform two or more different volume sample introduction successively, has the characteristics of accurate quantification, simple operation, continuous operation, no dead volume, convenient connection with detection system, and matching use with an automatic sample injector, and realizes automated analysis of batch gas samples. By applying the variable volume sample introduction technology provided by the invention to analysis of carbon-hydrogen isotopes in natural gas, the requirements for determining the isotope ratio of different concentration component (carbon dioxide, methane, ethane, propane, isobutane, n-butane) of hydrogen and carbon can be satisfied, the signal response of all stratographic components in an isotope mass spectrometer is within a dynamic varying range and is close to working standard signal intensity as far as possible, thereby avoiding multiple injection of isotope analysis, facilitating laboratory isotope analysis work, and improving the work efficiency of sample test.

A process and an apparatus for isotope ratio analysis, the process having the following steps: performing a liquid chromatography process and thus providing an eluate which comprises at least one liquid carrier fluid and at least one analytes, collecting a portion of interest from the eluate, processing the eluate portion to form at least one gaseous conversion products of the analytes, and supplying the gaseous conversion products, especially with gaseous carrier fluid, to an isotope analyzer and determining the isotrope ratios.

Biological fluid samples containing proteins (e.g., blood plasma or saliva) are prepared for isotopic analysis by precipitating the proteins while leaving the isotopic ratio unaffected. This precipitation can involve adding metal ions, salts, organic solvents, or organic polymers. The sample is then centrifuged to allow transfer of the supernatant for isotopic analysis, e.g. by tunable diode laser absorption spectrometry to obtain a quantitative measure of the 2H and 18O isotope levels in the water relative to reference standards.

The invention relates to the field of element isotope analysis, and particularly discloses an element isotope analysis system, an analysis method of sulfur isotopes in a trace sulfate sample and application of the analysis method. The system comprises an element analyzer, an enrichment device, a gas chromatographic column, an isotope ratio mass spectrometer and a heating device which are connectedin sequence, and pipelines for connecting or communicating equipment, wherein the pipeline used for connecting or communicating the equipment is a Teflon pipe, the gas chromatographic column is a chromatographic column made of a Teflon material, the enrichment device comprises a multi-way valve, a sample tube and a cooling trap, at least one part of the sample tube can be arranged in the coolingtrap to realize enrichment, and the heating device is arranged around the sample inlet, the sample inlet valve and the ion source of the isotope ratio mass spectrometer. The analysis method is simple,controllable, easy to operate, capable of utilizing the sample to the maximum extent, low in instrument detection limit, high in sensitivity, small in analysis error and high in accuracy.

The present invention provides a hydrogen isotope analysis method of a light hydrocarbon monomer hydrocarbon in natural gas and a light hydrocarbon enrichment apparatus. The apparatus comprises a natural gas sample cylinder, a light hydrocarbon collection bottle, a water removal purification pipe, a light hydrocarbon enrichment tube and a temperature control box; the natural gas sample cylinder and the water removal purification pipe are in communication, a connecting pipe of the natural gas sample cylinder and the water removal purification pipe is provided with a gas-pressure meter and a first needle valve; the water removal purification pipe is in communication with one end of the light hydrocarbon enrichment tube, a connecting pipe of the water removal purification pipe and the light hydrocarbon enrichment tube is provided with a tee joint, and the tee joint is in communication with the light hydrocarbon collection bottle; the other end of the light hydrocarbon enrichment tube and a gas flowmeter are in communication, a connecting pipe of the light hydrocarbon enrichment tube and the gas flowmeter is provided with a second needle valve; the other end of the light hydrocarbon enrichment tube is provided with a third needle valve; and the temperature control box is arranged outside the light hydrocarbon enrichment tube. The hydrogen isotope analysis method of the light hydrocarbon monomer hydrocarbon in the natural gas is completed by use of the light hydrocarbon enrichment apparatus. The hydrogen isotope analysis method of the light hydrocarbon monomer hydrocarbon in the natural gas and the light hydrocarbon enrichment apparatus have the advantages of simple structure, easy and fast operation, high analysis data accuracy and good repeatability.

The invention relates to a method for fast determination of oxygen isotope composition of water in beverage wine and belongs to the technical field of stable isotope analysis. The method comprises carrying out gas chromatographic column separation on water and other oxygen-containing organic matters in a beverage wine sample, transforming the water into carbon monoxide by a pyrolysis method, determining produced carbon monoxide delta<18>O by a stable isotope ratio mass spectrum, and carrying out calibration by international or national water reference substances to obtain oxygen isotope composition of water in beverage wine, wherein the composition is characterized by delta<18>O.

The invention discloses a open-type natural gas generating dynamics research device and method, aims at providing a experiment device that structure is easy, reliability is high, operation is convenient, cost of analysis is low, the technique scheme includes high-pressure gas source, flow controller, sample pyrolyzer, several air vessels, vacuumized device and main controller, it controls hydrocarbon gas generated by sample in different temperature interval via valve transforming controller controlled by main controller to enter different air vessels, when course of storing gas of the first air vessel is over, gas phase chromatogram can be used to analyze component of gas on-line, and component of gas can be analyzed to determine the nature and quantitative analysis and carbon isotope and hydrogen / deuterium isotope analysis, dynamics parameter generated by natural gas can obtained based on temperature heat simulating and corresponding gas stored in air vessels; the invention can be used in single constituent natural gas generating dynamics research.

The invention discloses an on-line degassing system for isotopc analysis of gaseous hydrocarbon acidolysis gas in rock. The system comprises an acidolysis gas degasser, an adsorption enrichment apparatus, a six-way valve and a separator; the acidolysis gas degasser comprises a sample disk, a sample bottle, an acid needle, a sample introduction needle; a cover is arranged on the sample disc, the sample bottle passes through the cover and is placed in the sample disc, the acid needle and the sample introduction needle respectively pass through a sample bottle plug and are inserted into the sample bottle; the adsorption enrichment apparatus comprises an alkali lye bottle, a de-watering trap and a cold trap made by a special material; one end of the sample introduction needle is inserted into the alkali lye bottle, the de-watering trap inlet tube is inserted into the alkali lye bottle, the de-watering trap outlet pipe is connected to the six-way valve, the separator comprises a chromatographic column, an oxidation furnace and an opening shunt tube; two ends of the cold trap are respectively connected to the six-way valve; a port 5 of the six-way valve is connected to a helium introduction pipe, and a port 6 of the six-way valve is connected to the chromatographic column. The on-line degassing system realizes the on-line analysis of acidolysis hydrocarbon isotope and avoids the isotope fractionation effect, and the test result is accurate.

In a method of resolving a contribution ratio to soil contamination by a plurality of polluters through a sequential extraction scheme and a stable isotope analysis scheme, Pb stable isotopes are eluted at 5 types of “cation exchange fraction”, “carbonate fraction”, “iron-oxide and manganese hydroxide-fraction”, “organic matters and sulfide fraction”, and “residual fraction” existing at other types and separated from each other in each step. The Pb stable isotopes obtained in each step are analyzed.The contribution ratio to soil contamination by the polluters is resolved through a predetermined resolving equation using the content of a Pb stable isotope in each step based on the content ratio of the Pb stable isotopes. The Pb stable isotopes are 206Pb and 207Pb.

The invention discloses a method and device for analyzing Xe isotope in methane-enriched natural gas, and relates to the technology of noble gas isotope analysis. The method comprises the following steps of Xe-enriching treatment by negative pressure extraction, moisture removal and low-temperature collection on external natural gas to obtain a to-be-detected sample which has the Xe content enough for detecting the Xe isotope information and takes Kr and Xe as main components from the external natural gas; purification treatment for the to-be-detected sample taking Kr and Xe as main components to obtain an analyzing sample which only contains Kr and Xe components; and separation treatment for the analyzing sample which only contains Kr and Xe to obtain an analyzing sample only containing Xe, and isotope analysis on the analyzing sample only containing Xe to obtain the isotope information of Xe in the natural gas sample. The method can be used for directly obtaining the Xe isotope content, has few influence factors in the analyzing process, and has the advantages of accurate result, high efficiency, simple operation and wide universality.