| 一种起伏地表条件下的照明补偿方法 |
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| 引用本文： | 叶月明,吴如山,范国章,丁仁伟.一种起伏地表条件下的照明补偿方法[J].地球物理学报,2021,64(1):224-232. |
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| 作者姓名： | 叶月明 吴如山 范国章 丁仁伟 |
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| 作者单位： | 中国石油天然气股份有限公司杭州地质研究院,杭州310023;Modeling and Imaging Laboratory,University of California,Santa Cruz,U.S.A.95064;中国石油天然气股份有限公司杭州地质研究院,杭州310023;山东科技大学地球科学与工程学院,青岛266590 |
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| 基金项目： | 国家自然科学基金项目（41504105、41874164）和国家油气专项（2017ZX05026）资助. |
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| 摘 要： | 起伏的地表条件限制了采集孔径范围并造成深层地震照明不足,为改善该类地区的成像质量,本文提出了一种起伏地表条件下的照明补偿方法.首先,基于小波束波场延拓算子和逐步累加的外推方法在波场延拓过程中解决起伏地表面的影响,并引入空间滤波函数压制虚拟层内的偏移噪音;其次,利用局部指数标架对上、下行波场分解,得到局部角度域成像和照明补偿因子.再次,利用计算出的成像值和照明补偿因子,在局部倾角域完成照明补偿.SEG起伏地表模型测试证明了本方法的有效性,深层构造照明度明显加强,不同角度成像振幅更加均衡,该技术为提高起伏地表地区的成像品质提供了新的手段.
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| 关 键 词： | 起伏地表 照明补偿 小波束 局部指数标架 局部角度域 |
| 收稿时间： | 2020-03-09 |
A method of illumination compensation in areas with irregular topography |
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| YE YueMing,WU RuShan,FAN GuoZhang,DING RenWei.A method of illumination compensation in areas with irregular topography[J].Chinese Journal of Geophysics,2021,64(1):224-232. |
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| Authors: | YE YueMing WU RuShan FAN GuoZhang DING RenWei |
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| Institution: | 1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;2. Modeling and Imaging Laboratory, University of California, Santa Cruz, U. S. A. 95064;3. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | Irregular surface limits the range of acquisition aperture and renders the weak illumination of deep layers. In order to improve the image quality in area with irregular surface, we proposed a way to compensate the seismic illumination. Firstly, influences from irregular surface were solved during wavefield continuation based on beamlet propagator and wavefield added gradually. A spatial filter was introduced to suppress migration noise in virtual layers. Secondly, Images and compensation factors were obtained by decomposing up-going and down-going wavefield with local exponential frame. Finally, we performed compensation in local dip angle domain with obtained images and compensation factors. SEG irregular surface model test proved the validity of our method. Illumination of deep layer was improved and image amplitude from different angles were more balanced. We proposed a new method to improve the image quality in area with irregular surface. |
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| Keywords: | Irregular surface Illumination compensation Beamlets Local exponential frame Local angle domain |
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