次生作用对原油和油包裹体荧光颜色及光谱参数的影响

Secondary Alterations Influence on Fluorescence Color and Spectral Parameters of Crude Oil and Oil Inclusion

在采集多个含油气盆地油样和岩样基础上,利用显微荧光光谱和有机地化参数研究了次生作用对原油和油包裹体荧光颜色及光谱参数的影响。结果表明,原油次生蚀变主要通过改变原油中饱/芳比来影响荧光参数,其中生物降解和水洗作用使原油荧光颜色、谱形发生改变,并使荧光参数发生红移,气侵分馏和裂解作用使得原油荧光参数发生蓝移,混源作用则使两端元油分别发生红移和蓝移。通过原油和油包裹体的QF-535频率直方图可以定性识别研究区的次生作用或主成藏期。建立研究区衡量次生变化的参数与QF-535的关系式,可半定量判别原油遭受次生蚀变的程度。在显微荧光测试中应该剔除遭受过拉伸或渗漏、热裂解和光氧化作用的油包裹体。

Based on oil samples and rock samples in several petroliferous basins,this paper studied that secondary alterations in-fluence on fluorescence color and spectral parameters of crude oil and oil inclusions by using microscopic fluorescent spectral and geochemical parameters.The results demonstrated that secondary alterations influence on spectral parameters by changing the ratio of saturated hydrocarbon and aromatic hydrocarbon（saturation/aromatics）.Biodegradation and water washing lead to red-shift of fluorescence parameters while evaporative fractionation and oil cracking lead to blueshift.Beside,mixed oil lead to red-shift and blueshift.The secondary alterations and main period of accumulation in research area were recognized by frequency his-togram of crude oil and oil inclusion.The relationship between QF-535 and the parameters measuring the secondary alterations could the extent of secondary alterations from which crude oil suffered.In the microscopic fluorescence test,oil inclusions suf-fered from stretch or leakage,thermal cracking and photooxidation should be rejected.