中国典型煤的激光显微荧光特征及R-I-VR_o相关模式图的建立

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

利用激光显微荧光探针、MPV－Ⅲ显微光度计等方法系统地研究了我国典型煤的激光显微荧光特征，并运用二项参数（I400、R）与澳大利亚同期煤进行了对比，结果发现我国煤的I400普遍比澳大利亚同期煤高，据此，建立了我国煤的R－I－VRo相关模式留，该图对于正确评价我国烃源岩成熟度具有重要意义。

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 telocollinite. They are positive alteration, negative alteration and negative -positive alteration, depending on the ther mal 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: I400 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 sindlar to that of the Australlan coals. However, I400 of telocoilinite in the Chinese coals is higher than that of the Australian coals, up to 1 000-2 000 relative intensity units. The meastired VRo of the Chinese coals is different from EqVRo(equivalent vitrinite reflectance) which was derived from their fluorescence parameters in the R-I-VRo model based on the Australian coals, with a higher EqVRo value by 0. 01%-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 petrollferous 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.