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A method for extracting hydrocarbons wrapped in asphaltenes from source rocks

A technology for asphaltenes and hydrocarbon source rocks, applied in the field of analysis, can solve the problems of inability to accurately measure and the biological standard compounds cannot reach the mass spectrometry detection line, etc., and achieve the effects of improving accuracy, increasing concentration, and increasing analytical concentration.

Active Publication Date: 2021-09-28
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

In this way, the very small amount of hopane and sterane biomarker compounds cannot reach the detection line of mass spectrometry and cannot be accurately determined

Method used

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  • A method for extracting hydrocarbons wrapped in asphaltenes from source rocks
  • A method for extracting hydrocarbons wrapped in asphaltenes from source rocks
  • A method for extracting hydrocarbons wrapped in asphaltenes from source rocks

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Embodiment Construction

[0027] A method for extracting source rock asphaltene wrapped hydrocarbons, comprising the following steps:

[0028] (1) Soxhlet extraction of source rocks to obtain extracts. The specific process is as follows:

[0029] Accurately weigh 200–300 g of source rock samples and put them into a filter paper tube extracted with chloroform, seal the mouth of the paper tube with absorbent cotton thread, then put the filter paper tube into an extraction tube with a diameter of 2–2.5 cm, add two Transfer the methyl chloride-methanol mixture to the 2 / 3 of the extraction bottle, extract it in a water bath at 40±0.5°C for 72 hours, recover the solvent, then evaporate the solvent in a water bath at 40±0.5°C to 1~2mL, then transfer it into a weighing bottle , and rinse the recovery bottle with dichloromethane-methanol mixture (v:v, 9:1) for 3 times, combine the rinse solution into a weighing bottle, put the weighing bottle in a fume hood to dry naturally, and weigh it after weighing. That ...

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Abstract

The invention relates to a method for extracting source rock asphaltene-encapsulated hydrocarbons, comprising the following steps: (1) Soxhlet extraction of source rocks to obtain extracts; (2) adding n-heptane to the extracts to precipitate asphaltenes to obtain precipitates (3) the asphaltene after precipitation is repeatedly subjected to Soxhlet extraction until the obtained extract is detected by GC / MS without organic components, and the asphaltene is obtained; (4) the asphaltene is extracted with dichloromethane Wrap it with filtered filter paper, then place it in a fume hood to dry naturally at room temperature, and then grind it to obtain ground asphaltene; (5) The ground asphaltene is subjected to ultrasonication, membrane filtration, separation and elution of group components, and saturated hydrocarbons, Aromatic hydrocarbons and non-hydrocarbon components; (6) Saturated hydrocarbons, aromatic hydrocarbons, and non-hydrocarbon components are directly extracted through the non-polar solid-phase microextraction column head, and then the extraction column head is inserted into the GC inlet, and analyzed and injected at 280°C for detection. The invention can improve the detection accuracy and solve the difficult problems of oil source correlation, maturity and depositional environment identification of severely biodegraded source rocks.

Description

technical field [0001] The invention relates to the technical field of analysis, in particular to a method for extracting hydrocarbons wrapped in asphaltenes in source rocks. Background technique [0002] The hydrocarbon components encapsulated in asphaltene are hydrocarbon compounds protected by the macromolecular network structure of asphaltene. They have not been damaged by microorganisms in the later reformation of source rocks, and their original appearance has been retained, which can be used to identify severely degraded source rocks. Sedimentary environment, maturity, kerogen type and main means of oil source correlation. Unfortunately, there is still a lack of rapid and accurate extraction methods for the encapsulating hydrocarbon components in source rock asphaltenes. [0003] The ruthenium ion catalyzed-oxidation method can oxidize condensed ring aromatic hydrocarbons on macromolecules to various benzene polyacids without destroying the aliphatic structure, so th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/76
CPCG01N30/02G01N30/06G01N30/76G01N2030/062
Inventor 吴应琴刘艳红侯孝欢王作栋刘艳
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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