| 局部倾角滤波和预测反演联合分离绕射波 |
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| 引用本文： | 朱生旺,李佩,宁俊瑞.局部倾角滤波和预测反演联合分离绕射波[J].地球物理学报,2013,56(1):280-288. |
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| 作者姓名： | 朱生旺 李佩 宁俊瑞 |
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| 作者单位： | 中国石油化工股份有限公司石油勘探开发研究院, 北京 100083 |
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| 基金项目： | 国家重点基础研究发展计划(973)课题“碳酸盐岩缝洞型油藏缝洞单元地球物理表征研究”(2011CB201002);重大专项课题“缝洞储集体识别与描述技术研究”(2011ZX05014-001)联合资助 |
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| 摘 要： | 地震绕射波源于介质非连续性,从地震记录中将绕射波分离出来并进行成像,其结果对研究诸如碳酸盐岩缝洞储层这类复杂非均质储层具有重要意义.对炮集记录进行平面波分解,在地层倾角不大的假设下,反射波和绕射波同相轴在平面波分解剖面上存在较大的倾角差异.基于此,我们提出分步进行绕射波分离的方法:(1)利用局部倾角滤波方法将绕射波的较大倾角信息成分分离出来,此时,余下的部分包含有反射波和残留的低倾角绕射波信息;(2)利用频率-空间域预测反演方法从上述含有反射波和残留的低倾角绕射波信息中分离出残留绕射波成分;(3)将两次分离的绕射波信息相加得到最终的绕射波估计.用该方法能够得到相对完整的绕射波信息,有效地克服了靠单一的倾角差异进行绕射波分离时明显损失低倾角信息,从而影响绕射波成像结果横向分辨率这一问题.理论与实际资料试算验证了该方法的有效性.
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| 关 键 词： | 绕射波分离 倾角滤波 预测反演 分辨率 |
| 收稿时间： | 2011-10-24 |
Reflection/diffraction separation with a hybrid method of local dip filter and prediction inversion |
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| ZHU Sheng-Wang
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LI Pei
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NING Jun-Rui.Reflection/diffraction separation with a hybrid method of local dip filter and prediction inversion[J].Chinese Journal of Geophysics,2013,56(1):280-288. |
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| Authors: | ZHU Sheng-Wang LI Pei NING Jun-Rui |
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| Institution: | Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China |
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| Abstract: | It is of great significance to separate seismic diffractions from seismic data and apply the imaged results of these separated diffractions to the research of some complicated reservoirs, the karst reservoir for example. On the planar decomposition section, the dip difference between specular reflection events and diffraction events is remarkable in the case that the dips of reflection interfaces are small. Based on the above facts, we propose a hybrid method for diffraction separation: (1) We divide each planar decomposition section into two portions by local dip filtering: the portion d1 mainly containing diffraction information with high dip and the portion r1 containing the specular reflection r and residual diffraction information with low-dip (d2); (2) The separation of specular reflection r and residual diffraction information d2 from r obtained in step (1) is conducted by prediction inversion in F-X domain; (3) d2 added to d1 makes the estimation of diffractions. This separation method can get relatively complete diffraction information, which effectively avoids the problem appearing in the general filter methods based only on dip attribute that low dip portion of diffraction is lost and thus narrowing the spatial bandwidth of the diffraction which will damage the lateral resolution. The feasibility of the proposed method is proven by both theoretical and real data tests. |
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| Keywords: | Diffraction separation Dip filter Prediction inversion Resolution |
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