双谱特征荧光强度比值法在定量荧光录井中的应用

The Apllication of the Ratio of Two-spectrum Characteristic Fluorescence Intensities in Quantitative Fluoresence Logging Technology

在钻井液污染条件下,准确、快速判别原油荧光显示是定量荧光录井技术的关键。为了寻找一种更科学、实用的技术方法,使该技术向更成熟和完善的程度发展,该文在国内外大量资料调研和室内实验、研究的基础上,首次提出了用于原油荧光显示识别的双谱特征荧光强度比值法。该方法综合提取了发射和同步荧光光谱的多重荧光信息,并利用新研制的原油荧光显示识别分析软件对信息进行智能化分析处理。该方法克服了当前定量荧光录井技术中岩样预处理过程带来的原油荧光信息损失,避免了背景扣除法的偏差。室内模拟实验和现场应用表明,该方法简便、快捷、准确,原油荧光发现率高。

Distinguishing oil fluorescence accurately with other interference fluorescence emitted by drilling fluid additives on well site is very critical for quantitative fluorescence logging under the condition of pollution of drilling fluids. Based on a large number of analyses of data in and abroad and laboratory researches, a new parameter named ratio of two-spectrum characteristic fluorescence intensities was first introduced in this paper. The parameter which would be used for distinguishing reservoir oil fluorescence has comprehensively extracted much more information from both of the two fluorescence spectrums, emission fluorescence spectrum and synchronous fluorescence spectrum. The extracted information could be intelligently processed by the newly developed software of distinguishing and analyzing oil fluorescence. Compared with conventional techniques of fluorescence logging, this method not only has the advantages of eliminating the deviation existing in the subtraction of background values and the loss of oil fluorescence information induced by core pre-processing, but also has the advantages of simplicity and efficiency which has been proved by both laboratory simulation tests and field application.