| HTI介质中的反射纵波方位属性 |
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| 引用本文： | 吴萍,杨长春,王真理,喻岳钰,孙福利.HTI介质中的反射纵波方位属性[J].地球物理学进展,2009,24(3):944-950. |
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| 作者姓名： | 吴萍 杨长春 王真理 喻岳钰 孙福利 |
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| 作者单位： | 中国科学院地质与地球物理研究所,油气资源研究重点实验室,北京,100029 |
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| 基金项目： | 国家重点基础研究发展计划 |
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| 摘 要： | 利用横波响应进行裂缝性各向异性介质的检测在实际应用中取得了很好的效果,但技术复杂、成本较高使该方法的广泛使用受到限制,而纵波资料采集和处理技术的精细有效保持了纵波的各种属性,这为直接利用纵波资料进行裂缝检测创造了条件.地下垂直定向裂缝通常用HTI介质模型来描述,为此,本文利用射线追踪和反射率法计算了层状各向同性介质背景下的HTI介质顶、底界面的反射纵波旅行时和反射系数,并分析了这些属性随观测方位的变化规律.研究表明,HTI介质底界面反射纵波旅行时和HTI介质顶界面反射系数表现出了明显的方位各向异性;旅行时、振幅和AVO梯度属性均在0°观测方位和90°观测方位上存在最大差异,可以用多种属性联合来精确判定裂缝的发育方向.
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| 关 键 词： | HTI介质 方位各向异性 纵波属性 AVO梯度 旅行时 振幅 |
| 收稿时间： | 2008-11-12 |
| 修稿时间： | 2009-4-24 |
Reflection P-wave azimuthal attribute in HTI medium |
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| WU Ping,YANG Chang-chun,WANG Zhen-li,YU Yue-yu,SUN Fu-li.Reflection P-wave azimuthal attribute in HTI medium[J].Progress in Geophysics,2009,24(3):944-950. |
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| Authors: | WU Ping YANG Chang-chun WANG Zhen-li YU Yue-yu SUN Fu-li |
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| Abstract: | The techniques of using S-wave response to investigate fractured anisotropy medium have achieved good results in practical application. However, these techniques are very complex and expensive, and then limited their application. Whenas various P-wave attributes are effectively preserved by accurate P-wave acquisition and processing techniques, thus it creates a beneficial condition to detect fracture using P-wave data. Vertical directional fractures are usually described as HTI medium model. Therefore this paper uses ray-tracing method and reflectivity method to compute the reflection P-wave double travel-time and reflection coefficient of top and bottom interface of HTI layer respectively, and analysis the variation rule of these attributes associated with observed azimuth. The research demonstrates that both reflection P-wave travel-time of the bottom interface of HTI layer and reflection coefficient of the top interface represent obvious azimuth anisotropy. The attributes of travel-time, amplitude and AVO gradient have the biggest difference between 0 degree and 90 degree observed azimuth, so we can use multiple attributes simultaneous to accurately detect the growing direction of fracture. |
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| Keywords: | HTI medium azimuthal anisotropy P-wave attribute AVO gradient travel-time amplitude |
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