A method for classifying crude oil biodegradation grades by n-paraffin residual ratio
A n-alkane and biodegradation technology, applied in material separation, analysis materials, instruments, etc., can solve the problems of difficult determination of biomarker compound composition, poor reliability of degradation grade classification results, and high cost, achieving short cycle and low cost , the effect of simple steps
Active Publication Date: 2022-05-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
This method requires mass spectrometry analysis of a series of biomarker compounds in crude oil, which has the disadvantages of long period and high cost
Not only that, because the composition of biomarker compounds in crude oil before biodegradation is difficult to determine, the reliability of the degradation grade division results based on the relative content changes of biomarkers is poor
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Embodiment 1
[0029] The LDW (Liaodong Bay) depression is an important oil and gas enrichment basin in eastern China. Hundreds of millions of tons of oil and gas reserves have been discovered, among which crude oil with a burial depth of less than 2000m has thickened to varying degrees, and the main reason for thickening is biodegradation effect.
[0030] The method for dividing the biodegradation level of crude oil in the depression area of LDW (Liaodong Bay) by utilizing the n-alkane residual rate of the present embodiment, the method is:
[0031] S1. Collect 30 crude oil samples from the LDW depression, and perform normal alkane chromatographic analysis after extraction to obtain 30 saturated hydrocarbon chromatograms; the chromatographic analysis method is SYT5120-1997 rock chloroform extract and crude oil saturated hydrocarbon gas chromatographic analysis Method; The 30 crude oil samples covered the depression's main oil fields and oil-bearing structures;
[0032] S2. Using the satu...
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The invention provides a method for dividing the biodegradation level of crude oil by using the n-alkane residual rate. The method is as follows: after the sample is extracted, the chromatographic analysis is obtained to obtain the saturated hydrocarbon chromatogram, and the nC at the "low flat-up" position of the baseline is selected. k and the spectrum range nCi‑nCj of the two n-alkanes before and after, the nC i and nC j Corresponding retention time T i and T j The chromatogram spectrum section between is the parameter extraction range, circles the saturated hydrocarbon chromatogram within the parameter extraction range the n-alkane envelope, the drift baseline and the horizontal baseline limited area, obtains the n-alkane residual area and the degradation loss area, calculates Residual rate of n-alkane, given the degradation level of crude oil and the distribution range of the corresponding residual rate, draw the spatial distribution map of crude oil with different degradation levels in the study area. The method of the invention has simple steps. Compared with the mass spectrometry analysis of complex series of compounds, the chromatographic analysis of normal alkanes has the advantages of short period, low cost and high precision, and provides a simple and quick method for quantitatively dividing the biodegradation level of crude oil.
Description
technical field [0001] The invention belongs to the technical field of classification of crude oil degradation grades, and in particular relates to a method for classifying crude oil biodegradation grades by utilizing the residual ratio of normal alkanes. Background technique [0002] Crude oil with shallow burial (<1800m) is susceptible to microbial degradation and thickening, making its exploitation difficult and low in recoverability. Determining the degree of biodegradation of crude oil in an area is not only the basis for analyzing the distribution of oil properties and revealing the process of oil and gas accumulation, but also the basis for formulating crude oil recovery plans and realizing efficient crude oil recovery. At present, the classification of the biodegradation degree of crude oil is mainly based on the anti-degradation ability of different biomarker compound series, and is completed by measuring the content change of each series of biomarker compounds. ...
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IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/8809
Inventor 程付启金强蔡盼盼王锐单宝杰王飞龙于文
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)