黏声VTI介质傅里叶有限差分叠前深度偏移
发布时间：2018-11-23 10:44
【摘要】：常规成像方法通常基于地下完全_>性各向同性的假设,而实际地下介质是黏弹性和各向异性的,忽略介质的黏滞性和各向异性会导致偏移剖面的振幅和成像位置出现偏差。本文在Futterman频散关系方程的基础上推导出黏声VTI介质高阶FFD(傅里叶有限差分)波场延拓算子,并将其应用于叠前深度偏移,该成像方法能较好地适应高角度入射波场。气块模型偏移结果证明了方法的正确性;标准Hess模型偏移结果验证了方法对强横向变化介质的适用性及成像的精确性;最后综合偏移剖面、波形及振幅谱对比等资料,详细剖析了介质黏滞性和各向异性对偏移成像的具体影响。文中各项研究均表明:经过黏滞性补偿和各向异性校正得到的偏移成像结果具有较高的信噪比和分辨率。
[Abstract]:Conventional imaging methods are usually based on the assumption that the subsurface is completely isotropic, but the actual underground media is viscoelastic and anisotropic. Neglecting the viscosity and anisotropy of the medium will lead to the deviation of the amplitude and the imaging position of the migration profile. In this paper, based on the Futterman dispersion equation, the high-order FFD (Fourier finite difference) wave field continuation operator in viscoacoustic VTI medium is derived and applied to prestack depth migration. The imaging method is suitable for high angle incident wave fields. The gas block model migration results prove the correctness of the method, and the standard Hess model migration results verify the applicability of the method to strongly transversal medium and the accuracy of imaging. Finally, the effects of medium viscosity and anisotropy on migration imaging are analyzed in detail by synthesizing migration profile, waveform and amplitude spectrum data. All the studies in this paper show that the migration imaging results obtained by viscosity compensation and anisotropy correction have high SNR and resolution.
【作者单位】： 中国石油大学(华东)地球科学与技术学院地球物理系;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家“973”课题(2014CB239006) 国家油气重大专项(2016ZX05002-005-07HZ,2016ZX05014-001-008HZ) 国家自然基金课题(41274124) 泰山学者工程专项基金等联合资助
【分类号】：P631.4
本文编号：2351305
[Abstract]:Conventional imaging methods are usually based on the assumption that the subsurface is completely isotropic, but the actual underground media is viscoelastic and anisotropic. Neglecting the viscosity and anisotropy of the medium will lead to the deviation of the amplitude and the imaging position of the migration profile. In this paper, based on the Futterman dispersion equation, the high-order FFD (Fourier finite difference) wave field continuation operator in viscoacoustic VTI medium is derived and applied to prestack depth migration. The imaging method is suitable for high angle incident wave fields. The gas block model migration results prove the correctness of the method, and the standard Hess model migration results verify the applicability of the method to strongly transversal medium and the accuracy of imaging. Finally, the effects of medium viscosity and anisotropy on migration imaging are analyzed in detail by synthesizing migration profile, waveform and amplitude spectrum data. All the studies in this paper show that the migration imaging results obtained by viscosity compensation and anisotropy correction have high SNR and resolution.
【作者单位】： 中国石油大学(华东)地球科学与技术学院地球物理系;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家“973”课题(2014CB239006) 国家油气重大专项(2016ZX05002-005-07HZ,2016ZX05014-001-008HZ) 国家自然基金课题(41274124) 泰山学者工程专项基金等联合资助
【分类号】：P631.4
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