光谱学与光谱分析 |
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Analyzing and Modeling Methods of Near Infrared Spectroscopy for In-situ Prediction of Oil Yield from Oil Shale |
LIU Jie, ZHANG Fu-dong, TENG Fei, LI Jun, WANG Zhi-hong* |
Instrument Science & Electrical Engineering College, Jilin University, Changchun 130026, China |
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Abstract In order to in-situ detect the oil yield of oil shale, based on portable near infrared spectroscopy analytical technology, with 66 rock core samples from No.2 well drilling of Fuyu oil shale base in Jilin, the modeling and analyzing methods for in-situ detection were researched. By the developed portable spectrometer, 3 data formats (reflectance, absorbance and K-M function) spectra were acquired. With 4 different modeling data optimization methods: principal component-mahalanobis distance(PCA-MD) for eliminating abnormal samples, uninformative variables elimination (UVE) for wavelength selection and their combinations: PCA-MD+UVE and UVE+PCA-MD, 2 modeling methods: partial least square(PLS)and back propagation artificial neural network (BPANN), and the same data pre-processing, the modeling and analyzing experiment were performed to determine the optimum analysis model and method. The results show that the data format, modeling data optimization method and modeling method all affect the analysis precision of model. Results show that whether or not using the optimization method, reflectance or K-M function is the proper spectrum format of the modeling database for two modeling methods. Using two different modeling methods and four different data optimization methods, the model precisions of the same modeling database are different. For PLS modeling method, the PCA-MD and UVE+PCA-MD data optimization methods can improve the modeling precision of database using K-M function spectrum data format. For BPANN modeling method, UVE, UVE+PCA-MD and PCA-MD+UVE data optimization methods can improve the modeling precision of database using any of the 3 spectrum data formats. In addition to using the reflectance spectra and PCA-MD data optimization method, modeling precision by BPANN method is better than that by PLS method. And modeling with reflectance spectra, UVE optimization method and BPANN modeling method, the model gets the highest analysis precision, its correlation coefficient (RP) is 0.92, and its standard error of prediction (SEP) is 0.69%.
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Received: 2014-05-24
Accepted: 2014-07-29
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Corresponding Authors:
WANG Zhi-hong
E-mail: zhwang@jlu.edu.cn
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