叠前弹性反演是目前地震油气检测的常用技术手段.但对于复杂油气储层,仅利用单一弹性参数难以对储层中流体进行有效识别,需要利用多种弹性参数,构建更为敏感的流体识别因子.通过对流体识别因子的重构机理、物理意义讨论分析,以松辽盆地大庆长垣PTH地区扶余油层为例,引入敏感度概念,用6种常用流体识别因子对油层敏感程度进行定量评价.研究认为高灵敏度流体识别因子FI对油层敏感度最高,是扶余油层含油检测的最佳流体识别因子,应用于实际地震资料取得良好效果.研究应用表明,在叠前弹性反演基础上构建有效流体识别因子,是地震油气检测的有效途径.%Prestack elastic inversion is the commonly used technique to detect the hydrocarbon at present.However,for the complex oil and gas reservoir,it is difficult to carry out effective identification of the reservoir fluids only by the single elastic parameter.Therefore,it is necessary to construct more sensitive fluid identifying factor with the help of a variety of the elastic parameters.By means of the discussion and analyses of the reconstructing mechanism and physical significances of the fluid identifying factors,taking Fuyu oil layers in PTH area of Daqing Placanticline in Songliao Basin as the example,and moreover introducing the concept of the sensitivity,6 kinds of commonly used fluid identifying factors have been quantitatively evaluated on the oil layer sensitive degree.The study shows that the high-sensitivity fluid identifying factor FI is most sensitive and can be the best identifying factor to Fuyu oil layer detection,and moreover much better applied effects have been achieved with the help of the actual seismic data.The researches and application prove that the established effective fluid identifying factors on the basis of the prestack elastic inversion are the effective approach for the seismic hydrocarbon detection.
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