| 光谱学与光谱分析 |
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| Microscopic Fluorescence Spectral Characteristics of Mixing Ratio of Crude Oil Experiment |
| SU Ao1, CHEN Hong-han1, HE Cong2,3*, LEI Ming-zhu4, LEI Chuan2, WANG Ping1 |
1. Key Lab of Tectonics and Petroleum Resource of Educational Ministry, China University of Geosciences, Wuhan 430074, China
2. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. Zhanjiang Branch, CNOOC, Zhanjiang 524057, China |
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Abstract The microscopic fluorescence spectroscopy has become a mature technology of fluid inclusions test and analysis system, which is used to distinguish different types of crude oil and oil inclusions. These would be the important basis to study the history of hydrocarbon accumulation of petroleum basins. The mixture of crude oil from different sources could occur in migration and accumulation process. In order to effectively identify the type of geological process, mixing ratio of crude oil experiment has been carried out. This study result shows that mixing of crude oil make fluorescence color and spectral parameters(λmax, QF535 and CIE-XY) change nonlinearly. Fluorescence spectral parameters of mixed oil is between end member oil A and B. The greater A or B ratio of mixed oil, the closer to A or B. Fluorescence color of mixed oil show nonlinear and gradual change in CIE-XY chromaticity diagram. Variation of spectral spectrum shape show that single peak is changed into double and three peaks. The relationship between QF535 and degree of mixing could calculate quantitatively relative contribution. Mixing different types of crude oil make spectral spectrum shape changes, which present characteristics of two peaks and three peaks but not unimodal peak. The main and subsidiary wavelength reserve wavelength information of end member oils. Based on variation characteristics of fluorescence spectrum, there are three different types of oil including blue, blue-green and yellow fluorescing oil filling in the bottom member of Pinghu formation in A gas field. At the same time, there also was a mixing process of blue-green fluorescing oil and yellow fluorescing oil. The degree of mixing is 47%~55%.
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Received: 2014-06-17
Accepted: 2015-01-22
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Corresponding Authors:
HE Cong
E-mail: hecong@lzb.ac.cn
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