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中国南方下古生界页岩成熟度很高、缺乏镜质组、固体沥青反射率变化大,成熟度的精确评价一直没有得到完善解决。通过对取自扬子地区古生界页岩样品中固体沥青(BRO=0.43%~5.51%)激光拉曼光谱特征的研究,发现固体沥青的激光拉曼光谱参数:峰位参数(WD与WG)、峰位差(RBS)、半高宽(FWHM-D与FWHM-G)及峰强度比(ID/IG)与沥青反射率均体现出一定的相关性,但相关程度差别明显,而且还明显受到成熟度水平的制约。对这些参数与沥青反射率进行了直线回归,筛选出了相关性比较好的指标是RBS(BRO值范围为1.5%~3.5%)与ID/IG(BRO>3.5%),两者相关系数高达0.95以上。研究认为,在建立标准方法的基础上,固体沥青激光拉曼光谱的这2个参数对早古生代及前寒武纪地层成熟度评价具有实际应用价值。
The Lower Paleozoic shale in southern China is highly matured. There is a lack of vitrinite, the variation of reflectivity of solid bitumen is big, and the accurate evaluation of maturity has not been solved completely. Through the study on Raman spectra of solid bitumen (BRO = 0.43% -5.51%) from Paleozoic shale samples from Yangtze area, the laser Raman spectrum parameters of solid bitumen were found: peak position parameters (WD and WG) , Peak position difference (RBS), FWHM-D and FWHM-G, and peak intensity ratio (ID / IG) all showed some correlation with asphalt reflectivity, but the correlation degree differed obviously, By the level of maturity constraints. Linear regression of these parameters and bitumen reflectivity was carried out. The best correlation indexes were RBS (BRO range: 1.5% ~ 3.5%) and ID / IG (BRO> 3.5% Above 0.95. Based on the establishment of a standard method, these two parameters of Raman spectra of solid pitch laser have practical value for the evaluation of maturity of Early Paleozoic and Precambrian formations.