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The use of low frequencies in a full-waveform inversion and impedance inversion land seismic case study

机译:低频在全波形反演和阻抗反演陆地地震中的应用案例研究

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摘要

Velocity model building and impedance inversion generally suffer from a lack of intermediate wavenumber content in seismic data. Intermediate wavenumbers may be retrieved directly from seismic data sets if enough low frequencies are recorded. Over the past years, improvements in acquisition have allowed us to obtain seismic data with a broader frequency spectrum. To illustrate the benefits of broadband acquisition, notably the recording of low frequencies, we discuss the inversion of land seismic data acquired in Inner Mongolia, China. This data set contains frequencies from 1.5-80 Hz. We show that the velocity estimate based on an acoustic full-waveform inversion approach is superior to one obtained from reflection traveltime inversion because after full-waveform inversion the background velocity conforms to geology. We also illustrate the added value of low frequencies in an impedance estimate.
机译:速度模型的建立和阻抗反演通常会受到地震数据中缺乏中间波数含量的困扰。如果记录了足够的低频,则可以直接从地震数据集中检索中间波数。在过去的几年中,采集方面的改进使我们能够获得具有更宽频谱范围的地震数据。为了说明宽带采集的好处,特别是低频记录,我们讨论了在中国内蒙古采集的陆地地震数据的反演。该数据集包含1.5-80 Hz的频率。我们表明,基于声学全波形反演方法的速度估计要优于从反射传播时间反演获得的速度估计,因为经过全波形反演后,背景速度符合地质条件。我们还说明了阻抗估计中低频的附加值。

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