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    基于高频信号识别算子的多道反演吸收补偿

    Multi-trace inversion for absorption compensation based on a high-frequency signal identification operator

    • 摘要: 地层吸收效应会衰减地震信号的高频分量,畸变其相位特性,进而削弱地震信号表征薄层结构的能力。吸收补偿技术是提高地震数据分辨率的关键手段之一。然而,由于噪声的干扰,补偿有效地震信号的同时往往伴随高频噪声的放大,进而限制了高频分量恢复的精度。针对上述问题,提出了一种基于高频信号识别算子的多道反演吸收补偿方法。该方法的核心思想是利用低频地震分量与高频地震分量间的频带映射关系,对有效频带内的地震数据进行频率延拓。然后,构建高频信号识别算子来准确表征高频信号特征,并将其作为正则化项引入多道反演目标函数中。模型数据试验和实际数据应用结果表明,所提方法在恢复高频信号的同时,有效抑制了高频噪声的放大,能够为储层解释提供高分辨率地震资料。

       

      Abstract: The reduction in seismic resolution caused by earth absorption, known as Q effect, is characterized by frequency-dependent amplitude attenuation and velocity dispersion. Inverse Q-filtering serves as a fundamental technique for attenuation compensation to enhance seismic resolution. However, high-frequency noises pose a trade-off for conventional methods as enhancing resolution inevitably degrades signal-to-noise ratio, thereby limiting their performance. To address this issue, we propose a multi-trace absorption compensation framework for the accurate stable recovery of seismic high-frequency components. A signal identification operator, expressed as a prediction error filter, is derived from attenuation data by leveraging the intrinsic mapping between low-frequency and high-frequency components. This operator captures inter-frequency dependencies and is integrated into the inversion objective function as a robust constraint for the precise recovery of high-frequency structures. Synthetic and field tests demonstrate the method's performance in achieving high-resolution seismic data with an improved signal-to-noise ratio.

       

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