首页|基于Cook距离的阻尼多道奇异谱分析分离绕射波

基于Cook距离的阻尼多道奇异谱分析分离绕射波

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地震绕射是提升小尺度不规则地质体成像横向分辨率的重要手段.常规地震记录中的绕射波会被能量强的反射波掩盖,因此需要分离出绕射波并成像.阻尼多道奇异谱分析是一种秩约束类的去噪方法,其原理为地震数据经过Hankel变换后做奇异值分解,反射波和绕射波分别对应着数值较大和较小的奇异值.然而该算法依赖人工确定反射波场的秩,不适用于海量地震数据处理.为了克服人工选择奇异值的问题,提出使用Cook距离作为自动计算反射波场秩的解决方案.将Cook距离和阻尼多道奇异谱分析算法相结合以实现反射和绕射波分离.模拟共炮检距道集和叠后实际数据实验表明,该方法能够有效获得高质量绕射波场.
Damped multichannel singular spectrum analysis for diffraction separation based on the Cook-distance
Diffraction seismic exploration is a crucial technique for enhancing the lateral resolution of small-scale geological structure imaging.Diffracted waves in conventional seismic records can be obscured by stronger energy reflected waves,making it necessary to separate these two wavefields for imaging purposes.Damped multi-channel singular spectrum analysis(DMSSA)is a rank-constrained denoising method that sepa-rates wavefields by decomposing the seismic data into a Hankel matrix and performing singular value decomposi-tion.In this process,reflected and diffracted waves correspond to larger and smaller singular values respec-tively.However,this method relies on manually determining the rank of the reflected wavefield,which is im-practical for processing large volumes of seismic data.To address the issue of manual selection,this pa-per proposes using Cook-distance to automatically calculate the rank of the reflected wavefield.By combining Cook-distance with the DMSSA algorithm,this paper achieved effective separation of reflected and dif-fracted waves.Experiments on common-shot gathers and post-stack data demonstrate that this method can suc-cessfully obtain high-quality diffraction wavefields,highlighting the effectiveness of the proposed approach.

diffracted waveseparationrank constraintdamped multi-channel singular spectrum analysis(DMSSA)Cook-distance

霍伟光、曹静杰、陈雪、赵惊涛、赵石峰、蔡志成

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河北地质大学自然资源部京津冀城市群地下空间智能探测与装备重点实验室,河北石家庄 050031

河北地质大学河北省战略性关键矿产资源重点实验室,河北石家庄 050031

河北地质大学数理教学部,河北石家庄 050031

河北地质大学地球科学学院,河北石家庄 050031

中国矿业大学(北京)地球科学与测绘工程学院,北京 100083

河北省煤田地质局物测地质队,河北邢台 054000

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绕射波 分离 秩约束 阻尼多道奇异谱分析 Cook距离

国家自然科学基金河北省自然科学基金&&河北省自然资源厅项目河北省高等学校基本科研业务费和河北地质大学科技创新团队项目

41974166D2021403010D2021403040KJCXTD202106

2024

石油地球物理勘探
东方地球物理勘探有限责任公司

石油地球物理勘探

CSTPCD北大核心
影响因子:1.766
ISSN:1000-7210
年,卷(期):2024.59(4)