Characteristics of Laser-induced Fluorescence of Some Typical Coals From China and Their R-I-VRo Model

LIU Zu-fa; XIAO Xian-ming; FU Jia-mo; R W T Wilkins

The Characteristics of fluorescence alteration of some typical coals from China has been investigated by means of laser microprobe. The results show that there are three fluorescence alteration patterns for telocolli- nite. They are positive alteration, negative alteration and negative -positive alteration,depending on the thermal maturation levels of these samples. They occur at VRo less than 0.60%,more than 1.10%,0.60-1.10%,respectively. Two alteration parameters:I4oo and R have been selected to differentiate the fluorescence alteration between Chinese coals and Australian coals. The results indicated that the R-I curve of the Chinese coals is quite similar to that of the Australian coals. However, I₄₀₀ of telocollinite in the Chinese coals is higher than that of the Australian coals, up to 1000-2000 relative intensity units. The measured VRo of the Chinese coals is different from E_qVRo(equivalent vitrinite reflectance) which was derived from their fluorescence parameters in the R-I-VRo model based on the Australian coals, with a higher E_qVRo value by 0.0l%-0.04%.According to this,a R-I-VRo model based on the fluorescence characteristics of the Chinese coals has been suggested. This model can be used to correct the measuring vitrinite reflectance for source rocks from Chinese petroliferous basins more correctly than the model of the Australian model. A case study was given for some typical samples from Tuha Basin. The results are plotted to this model. It presents that EqVRo is very close to the measured VRo.

Characteristics of Laser-induced Fluorescence of Some Typical Coals From China and Their R-I-VRo Model

1. Guangzhou Institute of Deochemistry, Chinese Academy of Sciences, Guangzhou, 510640;

2. CSIRO Division of Petroleum Resources, P. O. 136, North Ryde, Austrulfa,2113

Received Date: 1999-02-05

Rev Recd Date: 1999-04-20

Publish Date: 1999-12-10

Key words:

Abstract: The Characteristics of fluorescence alteration of some typical coals from China has been investigated by means of laser microprobe. The results show that there are three fluorescence alteration patterns for telocolli- nite. They are positive alteration, negative alteration and negative -positive alteration,depending on the thermal maturation levels of these samples. They occur at VRo less than 0.60%,more than 1.10%,0.60-1.10%,respectively. Two alteration parameters:I4oo and R have been selected to differentiate the fluorescence alteration between Chinese coals and Australian coals. The results indicated that the R-I curve of the Chinese coals is quite similar to that of the Australian coals. However, I₄₀₀ of telocollinite in the Chinese coals is higher than that of the Australian coals, up to 1000-2000 relative intensity units. The measured VRo of the Chinese coals is different from E_qVRo(equivalent vitrinite reflectance) which was derived from their fluorescence parameters in the R-I-VRo model based on the Australian coals, with a higher E_qVRo value by 0.0l%-0.04%.According to this,a R-I-VRo model based on the fluorescence characteristics of the Chinese coals has been suggested. This model can be used to correct the measuring vitrinite reflectance for source rocks from Chinese petroliferous basins more correctly than the model of the Australian model. A case study was given for some typical samples from Tuha Basin. The results are plotted to this model. It presents that EqVRo is very close to the measured VRo.

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Characteristics of Laser-induced Fluorescence of Some Typical Coals From China and Their R-I-VRo Model

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