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A method for analyzing sterane compounds in petroleum geological samples

A technology of geological samples and analysis methods, applied in the field of analysis of sterane compounds in petroleum geological samples, can solve the problems of complicated steps, wrong qualitative results, inability to achieve baseline separation, etc., and achieves simple, reliable and accurate sample preparation process. The effect of high degree of concentration and short sample extraction time

Active Publication Date: 2020-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] There are still some deficiencies in the above-mentioned existing analysis methods of sterane compounds, which are as follows: ① It is necessary to crush the rock first and extract the chloroform bitumen A, and it is also necessary to separate the group components of the rock extract to obtain the saturation Hydrocarbons, the separation process is not only cumbersome, but also takes a lot of time (a sample extraction and separation time is about 1 week), and the required sample volume is relatively large (more than 100g); ② Due to the irreversible adsorption of some compounds during the separation process, the change The original composition makes the comparability between different laboratories, different analysts and different batches of samples poor; ③ Gas chromatography-mass spectrometry or comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry analysis process, due to the limited efficiency of the chromatographic column, cannot realize all substances The baseline separation of sterane compounds may lead to errors in qualitative results.

Method used

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  • A method for analyzing sterane compounds in petroleum geological samples

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Experimental program
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Effect test

Embodiment 1

[0045] The petroleum geological sample in the present embodiment adopts the core sample of series drilling in continental sedimentary basin in eastern my country, and the analysis method of sterane compounds in the core sample comprises the following steps:

[0046] (1) Grind the core sample to rock particles with a particle size of 2-3 mm, take 100 mg of rock particles and place them in a 2 mL chromatographic bottle, add 1 mL of toluene to it, and obtain a weight-to-volume ratio of rock particles to toluene of 100 mg / mL of solution; sealed with a bottle cap lined with tinfoil, and soaked at room temperature for 6 hours; then ultrasonically oscillated the chromatographic bottle in an ultrasonic instrument for 15 minutes, then placed the bottom of the chromatographic bottle in a centrifuge tube and centrifuged for 10 minutes, the core sample The soluble organic matter in the chromatographic bottle is extracted into the supernatant liquid of the chromatographic bottle, and the s...

Embodiment 2

[0053] The petroleum geological sample in the present embodiment adopts the core sample of series drilling in continental sedimentary basin in eastern my country, and the analysis method of sterane compounds in the core sample comprises the following steps:

[0054] (1) Grind the core sample to rock particles with a particle size of 2-3 mm, take 400 mg of rock particles and place them in a 2 mL chromatographic bottle, add 1 mL of toluene to it, and obtain a weight-to-volume ratio of rock particles to toluene of 400 mg / mL of solution; the chromatographic bottle was ultrasonically oscillated in an ultrasonic instrument for 60 min; then sealed with a bottle cap lined with tinfoil, and the chromatographic bottle was placed at room temperature for 24 hours, then the soluble organic matter in the core sample was extracted into the chromatographic bottle In the supernatant, the supernatant is the liquid to be analyzed.

[0055] Step (2) is the same as in Example 1.

[0056] Step (3...

Embodiment 3

[0059] The petroleum geological sample in the present embodiment adopts the core sample of series drilling in continental sedimentary basin in eastern my country, and the analysis method of sterane compounds in the core sample comprises the following steps:

[0060] (1) Grind the core sample to rock particles with a particle size of 2-3 mm, take 100 mg of rock particles and place them in a 10 mL chromatographic bottle, add 5 mL of toluene to it, and obtain a weight-to-volume ratio of 20 mg / mL of rock particles to toluene. mL of solution; ultrasonically vibrate the chromatographic vial for 5 min in an ultrasonic instrument; then seal it with a bottle cap lined with tinfoil, place the chromatographic vial at room temperature for 12 h, and place the vial bottom down in a centrifuge tube for 60 min , the soluble organic matter in the core sample is extracted into the supernatant of the chromatographic bottle, and the supernatant is the liquid to be analyzed.

[0061] Step (2) is t...

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Abstract

The present invention relates to a method for analyzing sterane-based compounds in a petroleum geological sample. According to the method, organic matters in a rock core sample are extracted with an organic solvent, and the extracted supernatant is directly analyzed through atmospheric pressure photoionization high resolution mass spectrometry (APPI FT-ICR MS). According to the present invention,with the method, the sample consumption is low, the sample preparation process is simple, the sample extraction time is short, and the extract can be directly subjected to atmospheric pressure photoionization high resolution mass spectrometry analysis without concentration and separation so as to avoid the compound loss caused during the separation; and the atmospheric pressure photoionization high resolution mass spectrometry analysis process is accurate and rapid, the sterane-based compound carbon number distribution range detected by the high resolution mass spectrometry has high reliability and high accuracy compared to the GC-MS results, and the method for analyzing the sterane-based compounds in the petroleum geological sample is expanded.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development and oil refining and chemical research, and in particular relates to an analysis method for sterane compounds in petroleum geological samples. Background technique [0002] Biomarkers refer to those derived from living organisms in sedimentary organic matter, crude oil, oil shale, and coal, which have certain stability during the evolution of organic matter, with little or no change, and basically preserve the original biochemical composition. The carbon skeleton of the component is an organic compound that records the special molecular structure information of the original biological parent material. Biomarker compounds are a powerful tool in the study of oil and gas source, maturity, migration and other fields. [0003] Steranes are very important biomarkers in sedimentary organic matter and crude oil. The carbon number distribution range of steroidal compounds is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/88
Inventor 刘鹏蒋启贵黎茂稳李志明黄振凯曹婷婷马媛媛钱门辉
Owner CHINA PETROLEUM & CHEM CORP
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