基于照明补偿的逆时偏移成像质量改善研究
Research on Imaging Quality Improvement of Reverse Time Migration Based on Illumination Compensation
摘要: 逆时偏移(RTM)作为地震勘探中高精度成像手段，受照明不均匀影响，深层及边缘区域成像能量衰减严重。本文通过三层介质模型，采用均匀背景波场去除直达波干扰，对比补偿前后的RTM成像剖面，验证了照明补偿对改善振幅保真度和深部构造分辨率的有效性。实验表明，补偿后深层界面振幅提升约3~5倍，成像信噪比显著提高。
Abstract: Reverse Time Migration (RTM), as a high-precision imaging method in seismic exploration, suffers from severe energy attenuation in deep and marginal areas due to uneven illumination. In this paper, a three-layer medium model is adopted, and a uniform background wavefield is used to remove direct-wave interference. By comparing the RTM imaging sections before and after compensation, the effectiveness of illumination compensation in improving amplitude fidelity and deep structural resolution is verified. Experimental results show that the deep interface amplitude is increased by approximately 3~5 times after compensation, and the imaging signal-to-noise ratio is significantly improved.
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