| TTI介质自适应聚焦束叠前深度偏移 |
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| 引用本文：吴长满,韩建光,陈鹏.2026.TTI介质自适应聚焦束叠前深度偏移[J].地球学报,47(2):433-441. |
| DOI：10.3975/cagsb.2025.040901 |
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| 基金项目:本文由“地球深部探测与矿产资源勘查”国家科技重大专项(编号: 2024ZD1002201)、国家自然科学基金项目(编号: 42174157)和鄂尔多斯市标志性创新团队项目(编号: TD20232305)联合资助。 |
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| 中文摘要:自适应聚焦束偏移是一种新型的地震波场成像方法, 通过速度信息控制束宽使得波束能量更加聚焦, 对于复杂地质构造更具成像优势。为了提高各向异性介质地震波场的成像质量, 本文在各向同性自适应聚焦束偏移成像方法研究的基础上, 引入各向异性射线追踪方程, 提出了一种TTI介质自适应聚焦束叠前深度偏移方法。水平TTI介质模型的偏移成像对比分析表明, 本文方法成像结果相比于各向同性偏移和VTI介质偏移方法更加准确。通过对洼陷TTI介质模型和复杂断层TTI介质模型进行偏移成像测试, 进一步验证了本文方法对于各向异性复杂地质构造的成像效果明显好于各向同性偏移成像方法。 |
| 中文关键词:TTI介质 各向异性射线追踪 自适应聚焦束 数值算例 |
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| Adaptive Focused Beam Migration Considering Prestack Depth |
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| Abstract:Adaptive focused beam migration is a new method for imaging seismic wavefields. The beam energy is focused through controlling the beam width using velocity information, which is advantageous for imaging complex geological structures. We propose an adaptive focused beam migration method for TTI media to increase the imaging quality of seismic wavefields in anisotropic media by introducing anisotropic ray-tracing equations based on the isotropic adaptive focused beam migration method. The results of a comparative analysis of the imaging of horizontal TTI media model shows that the proposed method is more accurate than the isotropic migration and VTI migration methods. The migration test on the subsag and complex fault TTI media models further verifies that the imaging effect of the proposed method for anisotropic complex geological structures is substantially more accurate than that of the isotropic migration method. |
| keywords:TTI media anisotropic ray tracing adaptive focused beam numerical examples |
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