Quantitative analysis method for judging a petroleum degradation grade
A quantitative analysis and petroleum degradation technology, applied in the field of oil and gas geochemistry, which can solve the problems of crude oil failure, degradation and classification, etc.
Inactive Publication Date: 2020-01-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The method of the invention overcomes the defect that the crude oil of the same grade cannot be degraded and graded by the conventional biomarker method
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[0033] Taking crude oil samples from the Sanhe Village area of Shandong Shengli Oilfield as an example, the sample information is shown in Table 1. Biomarker compounds are used to classify the degradation grades in this oil area, all of which belong to the medium 4 degradation grade.
[0034] Table 1 Sample information sheet
[0035] well name Well section (m) layers lithology Ken 119-12 2527.00 Es4 crude Ken 119-9 1623.60 Ng crude Ken 119-7 1622.00 Ng crude Ken 123 / Ng thin oil Ken 71-3 1372.60 Ng crude Ken 126 1646.50 Next crude
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The invention relates to the technical field of oil gas geochemistry, in particular to a quantitative analysis method for judging petroleum degradation grade. The quantitative analysis method comprises the following steps: a sample preparation step of dehydrating a water-containing degraded oil sample and then weighing 50-100mg of the dehydrated water-containing degraded oil sample in a sample bottle; a sample degradation grade quantitative analysis step of analyzing the sample by using comprehensive two-dimensional gas chromatography-time of flight mass spectrometry; calculating the relativemass of n-isoparaffin, cyclane, arene and sterane, and terpane compound according to a peak area of a comprehensive two-dimensional gas chromatogram to be respectively denoted as A, B, C, D, and calculating an X value, wherein X=A / (A+B+C+D), the smaller the X value is, the larger the degradation grade is. The quantitative analysis method of the invention can finely divide the crude oil with the same source and the same degradation grade, thereby classifying the crude oil for geological research.
Description
technical field [0001] The invention relates to the technical field of oil and gas geochemistry, in particular to a quantitative analysis method for judging the degradation level of petroleum. Background technique [0002] my country has a large amount of heavy oil resources, as unconventional oil and gas resources, its exploration has attracted great attention. According to statistics, about 2 / 5 of the crude oil in the world has been destroyed and modified by bacteria. Biodegradable crude oil is the most important component of heavy oil. Determining its degradation level is of great significance for deepening the study of heavy oil reservoirs. [0003] The degraded oil undergoes secondary transformations such as oxidation, biodegradation, water washing, and deasphalting in the reservoir, making the compound composition particularly complex. With the increase of the degradation level, the compound composition changes regularly, and many commonly used biomarker compounds grad...
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IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/884G01N2030/8854
Inventor 鲍燕王学军刘庆张学军王忠宋长玉刘旋曹智金洪蕊翟正
Owner CHINA PETROLEUM & CHEM CORP
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