arXiv:2507.14140physics.geo-phcs.AI2025-07

用神经网络同时反演地震波形和地层阻抗,提升油藏描述精度。

Geophysics-informed neural network for model-based seismic inversion using surrogate point spread functions

  • 用深度卷积网络联合估计点扩散函数与阻抗,融合地质物理约束。
  • 在SEAM模型上训练100轮仅20分钟,生成高分辨率阻抗与真实波动特性。
  • 适合需要高精度地震反演的油气勘探研究人员。

基于模型的地震反演是油藏表征的关键技术,但传统方法受限于一维平均平稳子波假设及不切实际的横向分辨率。为此,本文提出一种地质物理信息神经网络(GINN),将深度学习与地震模拟相结合。该方法采用二维UNet架构的深度卷积神经网络(DCNN),同时估计点扩散函数(PSF)与声学阻抗(IP)。PSF被分解为零相位与残差分量,以保证地质物理一致性并捕捉细微结构。利用SEAM Phase I地球模型生成的合成数据进行训练,共100个周期(约20分钟),输入包括位置特征与低频阻抗(LF-IP)模型。采用结合均方误差(MSE)与结构相似性指数(SSIM)的自监督损失函数,确保结果准确性。GINN能生成高分辨率阻抗与符合预期地质特征的真实PSF。相比传统一维子波,该方法产生的PSF具有有限横向分辨率,降低噪声并提升精度。未来工作将优化训练流程,并在真实地震数据上验证该方法。

原文摘要 · Abstract (English)

Model-based seismic inversion is a key technique in reservoir characterization, but traditional methods face significant limitations, such as relying on 1D average stationary wavelets and assuming an unrealistic lateral resolution. To address these challenges, we propose a Geophysics-Informed Neural Network (GINN) that integrates deep learning with seismic modeling. This novel approach employs a Deep Convolutional Neural Network (DCNN) to simultaneously estimate Point Spread Functions (PSFs) and acoustic impedance (IP). PSFs are divided into zero-phase and residual components to ensure geophysical consistency and to capture fine details. We used synthetic data from the SEAM Phase I Earth Model to train the GINN for 100 epochs (approximately 20 minutes) using a 2D UNet architecture. The network's inputs include positional features and a low-frequency impedance (LF-IP) model. A self-supervised loss function combining Mean Squared Error (MSE) and Structural Similarity Index Measure (SSIM) was employed to ensure accurate results. The GINN demonstrated its ability to generate high-resolution IP and realistic PSFs, aligning with expected geological features. Unlike traditional 1D wavelets, the GINN produces PSFs with limited lateral resolution, reducing noise and improving accuracy. Future work will aim to refine the training process and validate the methodology with real seismic data.

地震反演神经网络地质建模

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