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An on-line analysis method for light hydrocarbon monomer hydrocarbon carbon isotope of source rock pyrolysis products

A technology of pyrolysis products and carbon isotopes, applied in the field of petroleum geological exploration, can solve the problems of isotope fractionation, complicated procedures, poor repeatability, etc., and achieve the effect of ensuring representativeness, simple operation and high reliability

Active Publication Date: 2015-11-18
PETROCHINA CO LTD
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Problems solved by technology

This method is complicated in operation, very time-consuming and poor in repeatability
In addition, these methods are extremely prone to isotope fractionation during sample enrichment and isotope detection operations

Method used

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  • An on-line analysis method for light hydrocarbon monomer hydrocarbon carbon isotope of source rock pyrolysis products
  • An on-line analysis method for light hydrocarbon monomer hydrocarbon carbon isotope of source rock pyrolysis products

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Embodiment

[0046] This example provides an on-line analysis method for the carbon isotope of light hydrocarbon monomer hydrocarbons in pyrolysis products of source rocks. figure 1 The apparatus shown is carried out, including the following steps:

[0047] (1) Take 100g of the gray limestone core sample of a certain well, break it into particles with a diameter of 0.8-2.0mm, accurately weigh 3.0g of the broken limestone sample particles, and put it into the sample tube 2 in the pyrolysis furnace 1 , fill the two ends of the sample tube 2 with quartz wool;

[0048] (2) the sample tube 2 (the pyrolysis furnace 1 that places this sample tube 2 together) that limestone sample particle is housed is connected on the sample inlet of gas chromatograph 12, and guarantees that the interface is airtight;

[0049] (3) Regulate the pressure adjustment knob 7 on the thermal cracker controller 9, so that the indication of the carrier gas pressure display gauge 8 remains on 15psi;

[0050] (4) After th...

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Abstract

The invention relates to an online analysis method for hydrocarbon carbon isotope of a light dydrocarbon monomer of source rock pyrolysis products. The method comprises the following steps: placing source rock sample particles into a sample pipe; connecting the sample pipe with a sample inlet of a gas chromatograph; adjusting the pressure of carrier gas of a pyrolyzer to 15 to 18psi; introducing the carrier gas to a pyrolyzing furnace for 5 to 10 minutes, and fully filling a liquid nitrogen cold trap with liquid nitrogen; heating the pyrolyzing furnace to be at a preset temperature, keeping the temperature for 30 minutes to obtain a hydrocarbon compound; lowering the temperature of the pyrolyzing furnace to 80 to 85 DEG C, removing the liquid nitrogen cold trap, and starting the gas chromatograph and an isotope ratio mass spectrometry; separating the hydrocarbon compound to single-molecule hydrocarbon compounds by the gas chromatograph; burning the single-molecule hydrocarbon compounds to obtain CO2; measuring the carbon isotope ratio of the CO2 by the isotope ratio mass spectrometry; and recording the carbon isotope ratio and generating a mass spectrum. The method provided by the invention has the characteristics of being high in reliability, convenient to operate, quick in analysis, and low in analysis cost.

Description

technical field [0001] The invention relates to an on-line analysis method for light hydrocarbon monomer hydrocarbon carbon isotopes of pyrolysis products of source rocks, and belongs to the technical field of petroleum geological exploration. Background technique [0002] At present, in oil and gas geochemical research, by studying the carbon isotope composition characteristics of conventional components in natural gas (such as: CH 4 、C 2 h 4 、C 3 h 8 ) has important theoretical and practical significance for determining the formation, migration, accumulation and source of natural gas, and many reports have been made so far. CN102253163A discloses a method for analyzing hydrocarbon carbon isotopes of trace hydrocarbon compounds monomers in natural gas, which includes the following steps: using solid phase extraction technology to enrich trace hydrocarbon compounds in natural gas, and then using gas chromatography to enrich The hydrocarbons are desorbed and separated by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 王东良马成华李剑李志生李谨王义凤王晓波代媛莫午零马卫郝爱胜崔会英孙庆伍
Owner PETROCHINA CO LTD
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