芳烃分析在油气化探中的作用和意义

三维荧光光谱具有指纹特征,分析钻井岩屑的荧光光谱,可以判别是否含油气或煤;分析油气样品的固定波长同步荧光光谱,可以推断油气是海相或陆相成因;根据荧光光谱的非油气特征,可以辩识污染或干扰.恒定能量同步荧光光谱技术能够消除拉曼光干扰,用于芳烃及石油分析,优于固定波长同步荧光光谱,是油气化探中有应用前途的方法.

THE ROLE AND SIGNIFICANCE OF AROMATIC HYDROCARBON ANALYSIS IN OIL AND GAS GEOCHEMICAL EXPLORATION

Fluorescence spectroscopy of aromatic hydrocarbons in oil and gas samples has been studied. The contours and three dimensional fluorescence spectra of crude oil are obviously different from those of coal in distribution and composition of aromatic hydrocarbons. The light crude oil might obtain the features of coal if it lies in the atmosphere for several years. When rocks stemmed from terrestrial oils, there exists the peak of perylene in Constant -Wavelength Synchronous Fluorescence Spectroscopy (CWSLS); when rocks stemmed from marine oils, there is only the peak of benzene and naphthalene. Interfering factors in borehole can be recognized by fluorescence spectra. Constant-Energy Synchronous Fluorescence Spectroscopy(CESLS), a technique which involves the simultaneous scanning of both monochromators with a constant energy difference, was used to analyze the three-component aromatic hydrocarbon mixtures and the crude oil. More benefits over CWSLS were observed in both cases.