基于基追踪去噪的高精度地震反射率反演方法及应用
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李杰(1986—), 男, 河北省石家庄市人, 高级工程师, 主要从事油气勘探储层预测及烃类检测研究相关研究。email: lijie51@cnooc.com.cn |
Editor: 殷波
收稿日期: 2025-03-05
修回日期: 2025-05-12
网络出版日期: 2025-06-03
基金资助
中国海洋石油集团有限公司“十四五”重大科技项目(KJGG2022-0403)
High-precision seismic reflectivity inversion method based on basis pursuit denoising and its application
Editor: YIN Bo
Received date: 2025-03-05
Revised date: 2025-05-12
Online published: 2025-06-03
Supported by
Major Scientific and Technological Project during the 14th Five-Year Plan Period of China National Offshore Oil Corporation(KJGG2022-0403)
基于基追踪去噪的地震反射率反演通过应用l1范数正则化产生稀疏解, 但由于正则化项的存在, 基追踪去噪获得的解与真实解之间总是存在偏差。为了减小这种偏差, 文章通过在基追踪去噪地震反射率反演中引入“残差回加”的策略, 提高了解的准确性。“残差回加”策略通过使用一个适中的权衡因子, 迭代执行快速迭代软阈值算法(fast iterative soft thresholding algorithm, FISTA)来求解基追踪去噪的目标函数, 而每次求解的残差将会不断加回至原始输入。与使用FISTA单次求解相比, 结合“残差回加”策略的FISTA求解得到的解更接近真实解。本文将该方法应用到我国南海珠江口盆地珠一坳陷惠西南古近系的文昌组储层, 通过高精度的波阻抗反演结果对钙质砂岩和滩坝砂岩进行了有效划分。
李杰 , 陈兆明 , 刘道理 , 刘灵 , 董国辉 , 刘徐敏 , 李坤娟 , 曾婷 . 基于基追踪去噪的高精度地震反射率反演方法及应用[J]. 热带海洋学报, 2026 , 45(2) : 140 -147 . DOI: 10.11978/2025039
Seismic reflectivity inversion based on basis pursuit denoising produces sparse solutions through the application of l1 norm regularization. However, due to the presence of the regularization term, there is always a deviation between the solution obtained by basis pursuit denoising and the true solution. To reduce this deviation, this paper introduces the “adding back the residual (ABR)” strategy in the seismic reflectivity inversion, thereby improving the accuracy of the solution. The ABR strategy uses a moderate trade-off factor to iteratively perform the Fast Iterative Soft Thresholding Algorithm (FISTA) to solve the objective function of basis pursuit denoising, and the residuals obtained each time are continuously added back to the original input. Compared with a single solution using FISTA, the solution obtained by FISTA combined with the ABR strategy is closer to the true solution. In this paper, this method is applied to the Wenchang Formation reservoir in the Zhuyi Depression of the Pearl River Mouth Basin in the South China Sea, and calcareous sandstone and beach-dam sandstone are effectively distinguished through high-precision impedance inversion results.
图2 ABR策略中权衡因子的数值测试图a、b、c和d分别展示了在权衡因子为0.1、1、5和10的条件下, 使用FISTA+ABR方法得到的反演结果(灰色竖条)与真实反射系数序列(黑色竖条)之间的比较。CC为相关系数 Fig. 2 Numerical tests of the trade-off factor in the ABR strategy. Panels (a), (b), (c), and (d) show the comparison between the true reflection coefficient sequence (black bars) and the inversion results (grey bars) obtained using the FISTA+ABR method under trade-off factors of 0.1, 1, 5, and 10, respectively |
图3 ABR策略中迭代次数的数值测试图a、b、c和d分别是使用FISTA+ABR方法, 在迭代次数分别为1、2、3和4的情况下, 反演得到的反射系数序列(灰色竖条)与真实反射系数序列(黑色竖条)之间的比较。CC为相关系数 Fig. 3 Numerical tests of the number of iterations in the ABR strategy. Panels (a), (b), (c), and (d) show the comparison between the true reflection coefficient sequence (black bars) and the inversion results (grey bars) obtained using the FISTA+ABR method with 1, 2, 3, and 4 iterations, respectively |
图4 在低信噪比情况下对ABR策略的数值测试a、b分别为信噪比5和2时的高斯噪声的合成地震记录; c、d分别为信噪比5和2时仅使用FISTA一次迭代得到的反射系数序列(灰色竖条)与真实反射系数序列(黑色竖条)之间的比较; e、f分别为信噪比5和2时使用FISTA+ABR得到的反射系数序列(灰色竖条)与真实反射系数序列(黑色竖条)之间的比较。CC为相关系数 Fig. 4 Numerical tests of the ABR strategy under low signal-to-noise ratio (SNR) conditions. (a) and (b) are synthetic seismic records with added Gaussian noise at SNR=5 and SNR=2, respectively; (c) and (d) show the comparison between the reflection coefficient sequences (grey bars) obtained using FISTA with one iteration and the true reflection coefficient sequences (black bars) at SNR=5 and SNR=2, respectively; (e) and (f) show the comparison between the reflection coefficient sequences (grey bars) obtained using FISTA+ABR and the true reflection coefficient sequences (black bars) at SNR=5 and SNR=2, respectively |
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