通过多参数FWI成像获得卓越分辨率:地震处理和成像的新理念

Q2 Earth and Planetary Sciences
Leading Edge Pub Date : 2023-01-01 DOI:10.1190/tle42010034.1
J. McLeman, T. Rayment, T. Burgess, K. Dancer, G. Hampson, A. Pauli
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引用次数: 0

摘要

几十年来,地震处理和成像工作流程已经得到了改进,以衰减记录波场的某些方面,这些方面可能会被传统的偏移算法(如Kirchhoff叠前深度偏移)不当地映射到图像域中。这些工作流程包括去宿主、指定、多路分解和正则化等技术,由于必须按顺序进行测试和应用,因此变得越来越复杂和耗时。然后,对单散射(仅初级)预处理数据进行迁移,并将其用于广泛的模型构建工作流程,包括反射残差时差层析成像,以细化低频地下模型。在每个阶段获得最佳结果需要对广泛的参数测试进行主观评估。结果可能是高度可变的,不同的决策会导致非常不同的结果。这样的工作流程意味着项目可能需要数月甚至数年的时间。全波形反转(FWI)成像为这种传统方法提供了一种替代理念。FWI成像是一种最小二乘多散射算法,它使用原始场数据(透射和反射到达以及它们的倍数和重影)来确定许多不同的地下参数,包括反射率。因为这种方法使用全波场,所以在反演过程中对地下进行了更完整的采样。在这里,我们演示了一种新的多参数FWI成像技术的应用,该技术可以直接从原始场数据中产生具有角反射率的高分辨率振幅变化,同时产生其他模型参数,如速度和各向异性。鉴于这些结果比传统工作流程更快地获得,具有更高的分辨率、改进的照明和降低的噪声,我们强调了多参数FWI成像取代传统工作流程的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Superior resolution through multiparameter FWI imaging: A new philosophy in seismic processing and imaging
Seismic processing and imaging workflows have been refined over many decades to attenuate aspects of the recorded wavefield which would be improperly mapped into the image domain by legacy migration algorithms such as Kirchhoff prestack depth migration. These workflows, which include techniques such as deghosting, designature, demultiple, and regularization, have become increasingly complex and time-consuming due to the sequential fashion in which they must be tested and applied. The single-scattering (primary-only) preprocessed data are then migrated and used in extensive model building workflows, including reflection residual moveout tomography, to refine low-frequency subsurface models. Obtaining optimal results at each stage requires subjective assessment of a wide range of parameter tests. Results can be highly variable, with different decisions resulting in very different outcomes. Such workflows mean that projects may take many months or even years. Full-waveform inversion (FWI) imaging offers an alternative philosophy to this conventional approach. FWI imaging is a least-squares multiscattering algorithm that uses the raw field data (transmitted and reflected arrivals as well as their multiples and ghosts) to determine many different subsurface parameters, including reflectivity. Because this approach uses the full wavefield, the subsurface is sampled more completely during the inversion. Here, we demonstrate the application of a novel multiparameter FWI imaging technique to generate high-resolution amplitude variation with angle reflectivity simultaneously with other model parameters, such as velocity and anisotropy, directly from the raw field data. Given that these results are obtained faster than the conventional workflow with a higher resolution, improved illumination, and reduced noise, we highlight the potential of multiparameter FWI imaging to supersede the conventional workflow.
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来源期刊
Leading Edge
Leading Edge Earth and Planetary Sciences-Geology
CiteScore
3.10
自引率
0.00%
发文量
180
期刊介绍: THE LEADING EDGE complements GEOPHYSICS, SEG"s peer-reviewed publication long unrivalled as the world"s most respected vehicle for dissemination of developments in exploration and development geophysics. TLE is a gateway publication, introducing new geophysical theory, instrumentation, and established practices to scientists in a wide range of geoscience disciplines. Most material is presented in a semitechnical manner that minimizes mathematical theory and emphasizes practical applications. TLE also serves as SEG"s publication venue for official society business.
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