Rapid Detection of Total Organic Carbon in Oil Shale Based on Near Infrared Spectroscopy

Quan-lun LI; Zheng-guang CHEN; Xian-da SUN

doi:10.3964/j.issn.1000-0593(2022)06-1691-07

Spectroscopy and Spectral Analysis, Volume. 42, Issue 6, 1691(2022)

Rapid Detection of Total Organic Carbon in Oil Shale Based on Near Infrared Spectroscopy

Quan-lun LI1,*... Zheng-guang CHEN1,1; *; and Xian-da SUN2,2; |Show fewer author(s)

Author Affiliations

¹1. College of Information and Electrical Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China

²2. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China

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Figures & Tables(12)

Fig. 1. Original spectra

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Fig. 2. Spectra after DT+BSC pretreatment

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Fig. 3. RMSE values of models with different characteristic wavelength numbers

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Fig. 4. Characteristic wavelengths selected based on SPA algorithm

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Fig. 5. Stability index of each wavelength variable and random variable

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Fig. 6. Characteristic wavelengths selected based on UVE algorithm

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Fig. 7. Process of selecting characteristic wavelengths based on CARS algorithm

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Fig. 8. Characteristic wavelengths selected based on CARS algorithm

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Table 1. Modeling results before and after removing outlier samples
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Table 1. Modeling results before and after removing outlier samples
剔除方法样本个数 $R_{c}^{2}$ RMSECV $R_{v}^{2}$ RMSEP
未剔除 230 0.660 8 0.419 0 0.624 6 0.443 6
MCCV 216 0.718 9 0.366 3 0.688 4 0.386 3

Table 2. Modeling results under different pretreatment methods

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Table 2. Modeling results under different pretreatment methods

光谱预处理方法	$R_{c}^{2}$	RMSEC	$R_{v}^{2}$	RMSEV
无	0.718 9	0.366 3	0.688 4	0.386 3
DT	0.746 0	0.341 4	0.621 6	0.382 0
Derivative-1	0.706 7	0.303 8	0.643 6	0.310 6
Derivative-2	0.719 8	0.365 8	0.663 9	0.342 3
SNV	0.548 7	0.464 2	0.376 0	0.426 5
S-G	0.729 3	0.359 6	0.695 3	0.382 4
BSC	0.658 5	0.403 8	0.570 8	0.449 4
DT+SNV	0.739 3	1.352 7	0.578 0	0.334 8
DT+BSC	0.759 1	0.315 9	0.734 8	0.357 3

Table 3. Sample set division
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Table 3. Sample set division
样本类型样本数最小值/% 最大值/% 均值/% 标准差
总体样本 216 0.053 3.922 1.835 0.693
校正集 144 0.053 3.922 1.897 0.747
验证集 72 0.699 2.783 1.713 0.551

Table 4. Modeling results of PLS, RF and SVM

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Table 4. Modeling results of PLS, RF and SVM

建模方法	特征波段筛选方法	波段数	校正集		验证集
建模方法	特征波段筛选方法	波段数	$R_{c}^{2}$	RMSEC	$R_{v}^{2}$	RMSEV
SVM	全谱波段	1 265	0.867 8	0.260 5	0.793 0	0.286 8
	CARS	65	0.912 4	0.204 6	0.906 6	0.222 0
	UVE	253	0.882 8	0.222 6	0.806 5	0.282 0
	SPA	16	0.883 5	0.244 0	0.815 3	0.278 0
RF	全谱波段	1 265	0.785 9	0.274 6	0.717 4	0.342 7
	CARS	65	0.812 5	0.297 6	0.765 9	0.316 9
	UVE	253	0.857 2	0.285 1	0.799 3	0.278 0
	SPA	16	0.842 5	0.293 7	0.812 7	0.323 5
PLS	全谱波段	1 265	0.765 5	0.314 8	0.742 1	0.342 5
	CARS	65	0.803 8	0.322 4	0.761 6	0.280 9
	UVE	253	0.834 5	0.284 3	0.754 1	0.310 0
	SPA	16	0.774 8	0.316 2	0.762 7	0.320 6

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Quan-lun LI, Zheng-guang CHEN, Xian-da SUN. Rapid Detection of Total Organic Carbon in Oil Shale Based on Near Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2022, 42(6): 1691

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