用卷积神经网络实现快速地震去混叠,效果媲美传统方法。
A convolutional neural network approach to deblending seismic data
- 设计适配地震数据特性的CNN,将混叠噪声转为随机分布
- 训练后可近实时处理,2万+真实数据验证效果
- 对不同地质区、不同延迟设置均表现鲁棒,适合工程部署
出于经济与效率考虑,地震数据的混叠采集正日益普遍。传统去混叠方法计算量大,步骤繁多,参数设置复杂。基于机器学习的方法有望显著缩短处理时间,改变现有流程。本文提出一种数据驱动的深度学习方法,用于快速高效地震去混叠。将混叠数据从共源域转换至共道域,使混叠噪声由相干事件变为非相干分布。据此设计了针对地震数据特性的卷积神经网络(CNN),其去混叠结果与工业标准算法相当。为保证真实性,混叠通过数值模拟生成,仅使用真实野外数据,包含超过20000个训练样本。模型训练与验证完成后,可实现近实时去混叠。实验表明,初始信噪比(SNR)是决定最终去混叠质量的主要因素。模型在新地质区域、不同延迟设置的数据上表现稳健,且能有效处理数据顶部的混叠噪声。
原文摘要 · Abstract (English)
For economic and efficiency reasons, blended acquisition of seismic data is becoming more and more commonplace. Seismic deblending methods are always computationally demanding and normally consist of multiple processing steps. Besides, the parameter setting is not always trivial. Machine learning-based processing has the potential to significantly reduce processing time and to change the way seismic deblending is carried out. We present a data-driven deep learning-based method for fast and efficient seismic deblending. The blended data are sorted from the common source to the common channel domain to transform the character of the blending noise from coherent events to incoherent distributions. A convolutional neural network (CNN) is designed according to the special character of seismic data, and performs deblending with comparable results to those obtained with conventional industry deblending algorithms. To ensure authenticity, the blending was done numerically and only field seismic data were employed, including more than 20000 training examples. After training and validation of the network, seismic deblending can be performed in near real time. Experiments also show that the initial signal to noise ratio (SNR) is the major factor controlling the quality of the final deblended result. The network is also demonstrated to be robust and adaptive by using the trained model to firstly deblend a new data set from a different geological area with a slightly different delay time setting, and secondly deblend shots with blending noise in the top part of the data.
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