| 含流体薄层时移地震AVA/AVF特征分析 |
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| 引用本文： | 姚振岸,孙成禹.含流体薄层时移地震AVA/AVF特征分析[J].吉林大学学报(地球科学版),2017,47(3). |
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| 作者姓名： | 姚振岸 孙成禹 |
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| 作者单位： | 中国石油大学(华东)地球科学与技术学院,山东 青岛 266580;青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东 青岛 266071 |
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| 基金项目： | 国家自然科学基金项目，山东省自然科学基金项目，国家科技重大专项项目(2016ZX05006-002)Supported by the National Natural Science Foundation of China，the Natural Science Foundation of Shandong Province，the National Science and Technology Major Project of China |
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| 摘 要： | 随着地震勘探的不断深入,对薄互层反射机理的研究变得越来越重要。为了准确获得薄层的频率特性并了解其时移变化规律,本文从弹性波动理论出发,讨论分析了薄层的反射AVA/AVF(amplitude variation with incident angle/amplitude variation with frequency)特征,并进行了数值模拟实验予以验证;基于实际测井资料和岩石物理等效介质理论,分析了含流体薄层的时移地震AVA/AVF特征。研究表明:薄层厚度和频率对薄层反射振幅响应的影响是等价的。随着薄层厚度的增加,薄层反射频率特性逐渐出现周期性变化;随着入射角度的增加,薄层反射频率特性逐渐向高频方向延伸。在薄层油气藏注水开发过程中,随着含水饱和度的增大,薄层反射P波频率特性向高频方向延伸,而薄层反射P-SV波频率特性基本保持不变。
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| 关 键 词： | 含流体薄层 时移地震 AVA AVF |
AVA/AVF Characteristic Analysis of Fluid-Containing Thin-Bed in Time-Lapse Seismic |
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| Abstract: | With the rapid development of seismic exploration, it is more and more important to explore reflection reflected mechanism of thin interbeds.In order to acquire the frequency characteristic of thin bed reflection and realize its changing feature in time lapse seismic, on the one hand, the authors discussed the AVA/AVF characteristic of fluid-containing thin bed based on elastic wave theory, and carried numerical simulation experiment;on the other hand, the authors analyzed time shift characteristics of fluid-containing thin bed based on the equivalent medium theory with the actual logging data.As it is shown that the amplitude responses associated with bed-thinning is equivalent to that associated with an increase in dominant frequency.With the increase of thickness, the reflection of thin bed experiences greater fluctuations.The frequency characteristic of a thin bed extends to higher frequency with increasing of incident angle.In the water flooding extraction process of thin layer reservoir, with increasing of the water saturation, the frequency characteristic of P wave reflection extends to higher frequency, whereas that of P-SV wave reflection remains about the same. |
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| Keywords: | fluid-containing thin-bed time-lapse seismic AVA AVF |
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