含油岩屑固体粉末荧光的研究

通过对含油岩屑固体粉末荧光的研究，指出了在固体粉末中含油浓度在一定范围内时，其粉末荧光强度与含油的浓度成线性关系，对二者关系进行线性拟合，其相关系数R=0．9936。当样品中的含油的浓度达到一定程度时，其荧光强度保持一个恒定的值。同时，研究了固体粉末荧光猝灭现象以及猝灭机制。指出含油岩屑粉末的荧光猝灭，主要是生荧团分子之间形成络合物以及由于激发光谱和发射光谱重叠所引起的交叉弛豫所致。最后比较了固体粉末中荧光浓度猝灭与溶液中浓度猝灭。这些对于研究和开发对含油岩屑直接进行荧光检测的录井技术具有重要的指导意义。

Solid Powder Fluorescence of Oil Cuttings

The solid powder fluorescence of oil cuttings was studied and we drawn a conclusion that in the range of certain oil concentration, the fluorescence intensity of the solid powder is linear with oil concentration in the powder of cuttings, with a regression coefficient of 0.993 6. But when the heavy oil concentration in the sample reaches a certain degree, the fluorescence intensity does not vary with oil concentration in the powder of cuttings, but its value does not equal zero. At the same time, the fluorescence quenching phenomena of oil cuttings were studied and the high concentration of heavy oil is the primary factor of the fluorescence quenching, which will causes non-linear relation between the fluorescence intensity and oil concentration in the powder of cuttings and results in false analytical data and error characters of spectra. From the study on the mechanism of concentration quenching of fluorescence, we obtained that the concentration quenching is mainly induced by the organic molecular interaction, such as formation of excimer and dimmer, intercrossing relaxation, etc. A comparison was made between the concentration quenching of solid powder fluorescence and the concentration quenching in solution. This showed that (1) when oil concentration of sample reaches a certain (degree,) the intensity of fluorescence keeps a constant in solid powder, but it equals zero in solution. 2 fluorescence peak of heavy oil locates at shorter wavelength in solid powder than that in solution. (3) the fluorescence quantum yield of heavy oil is larger in solid powder than that in solution. The study is important to develop a new analytical technique of quantitative fluorescence detector which can be applied to the analysis of solid samples with pretreatment, and is significance for quantitative fluo-(rescence) logging and organic geochemistry.