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Method for accurately measuring organic carbon content of shale

A technology of organic carbon and content, which is applied in soil material testing, chemical analysis by titration, and material inspection products, etc., can solve the problem of inaccurate measurement of shale organic carbon content, achieve accurate and comprehensive measurement results, and avoid determination. inaccurate effect

Inactive Publication Date: 2016-08-10
CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for accurately measuring the organic carbon content of shale, and solve the problem of inaccurate measurement of the organic carbon content of shale caused by existing measurement methods

Method used

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Embodiment

[0026] A method for accurately measuring the organic carbon content of shale, comprising the following steps:

[0027] 1) Take a complete piece of shale in proportion;

[0028] 2) Use an air extraction device to extract the shale gas in the shale into a closed container containing water, the water is pure water with an organic carbon content of 0.05mg / L;

[0029] 3) Perform ultraviolet oxidation treatment on the airtight container that has absorbed shale gas in step 2);

[0030] 4) Use a TOC meter to measure the organic carbon content of the aqueous solution treated in step 3), and at the same time measure the organic carbon content of the water used to absorb shale gas, and the difference between the two is the organic carbon content in shale gas;

[0031] 5) Use a pulverizer to pulverize the shale from which the shale gas has been extracted into a powder sample;

[0032] 6) Dissolve the powder sample with concentrated sulfuric acid drop by drop, and shake well. After the c...

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Abstract

The invention discloses a method for accurately measuring organic carbon content of shale. The method comprises the following steps: 1) acquiring a complete block of shale in proportion; 2) extracting shale gas in the shale into an enclosed container containing water; 3) carrying out ultraviolet oxidation treatment on the enclosed container having absorbed the shale gas; 4) measuring the organic carbon content of an aqueous solution having undergone oxidation in virtue of a TOC instrument and measuring the organic carbon content of water at the same time, wherein the obtained difference value represents the organic carbon content of the shale gas; 5) crushing the shale in which shale gas is extracted into a powdery sample; 6) dissolving the powdery sample with concentrated sulfuric acid; 7) measuring the organic carbon content of a uniform solution cooled in the step 6) by using a potassium dichromate oxidation-ferrous sulfate titration method; and 8) summing together the organic carbon content of the shale gas measured in the step 4) and the organic carbon content measured in the step 7) so as to obtain the total organic carbon content of the shale. The method provided by the invention can accurately measure the organic carbon content of the shale.

Description

technical field [0001] The invention relates to the technical field of measuring the organic carbon content of shale, in particular to a method for accurately measuring the organic carbon content of shale. Background technique [0002] Shale layers are unconventional natural gas that occurs in organic-rich shale and its interlayers, mainly in the form of adsorption and free, and its main composition is methane. It belongs to the same category as "coal gas layers" and "tight layers". The formation and enrichment of rock formations have their own unique characteristics, and they are often distributed in thick and widely distributed shale source rock formations in the basin. Shale gas has been recognized by people for a long time, but it is more difficult to collect than traditional natural gas. With the increasingly scarce resources, as a beneficial supplement to traditional natural gas, people gradually realize the importance of shale gas. Different from conventional gas res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N31/16
CPCG01N33/24G01N31/16
Inventor 李其鑫张鑫杨波
Owner CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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