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Reverse travel time imaging of microseismic location

机译:微震定位的反向行进时间成像

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摘要

The data sources used in microseismic locating include mainly the arrival time or waveform (wavefield value) in the microseismic record, and the algorithms used are mainly inversion or reverse time imaging. In terms of data source and algorithm, previously available methods generally fall into three categories: travel time inversion, waveform inversion, and reverse time imaging based on the wavefield. In this study, we propose a new reverse imaging method based on travel time. Starting with time invariance, we use the travel time of the back-propagated wavefield as a data source for imaging source location. We calculate the travel times from one receiver to all grid points directly rather than pick arrival times, and refer to this as the reverse travel time field (RTTF). The method of using the RTTFs of all receivers for imaging is called reverse travel time imaging (RTTI). RTTI images the whole research area and so overcomes the problem of a local minimum in travel time inversion. RTTI pre-prepares RTTF and there is no need to calculate travel time during imaging, which helps maintain the high computational efficiency as travel time inversion. The effectiveness, adaptability and resistance to some interfering factors in RTTI are tested using 2D acoustic numerical experiments.
机译:微地震定位中使用的数据源主要包括微地震记录中的到达时间或波形(波场值),而使用的算法主要是反演或逆时成像。在数据源和算法方面,以前可用的方法通常分为三类:传播时间反演,波形反演和基于波场的逆时成像。在这项研究中,我们提出了一种新的基于行程时间的反向成像方法。从时间不变性开始,我们将反向传播波场的传播时间用作成像源位置的数据源。我们直接计算从一个接收器到所有网格点的旅行时间,而不是选择到达时间,并将其称为反向旅行时间字段(RTTF)。使用所有接收器的RTTF进行成像的方法称为反向行进时间成像(RTTI)。 RTTI对整个研究区域进行成像,从而克服了旅行时间反演中局部最小值的问题。 RTTI预先准备了RTTF,因此无需在成像期间计算旅行时间,这有助于在旅行时间倒置时保持较高的计算效率。使用二维声学数值实验测试了RTTI的有效性,适应性和对某些干扰因素的抵抗力。

著录项

  • 来源
    《Exploration Geophysics》 |2019年第3期|281-296|共16页
  • 作者单位

    Jilin Univ, Coll GeoExplorat Sci & Technol, 938 Ximinzhu St, Changchun 130026, Jilin, Peoples R China;

    Jilin Univ, Coll GeoExplorat Sci & Technol, 938 Ximinzhu St, Changchun 130026, Jilin, Peoples R China;

    Jilin Univ, Coll GeoExplorat Sci & Technol, 938 Ximinzhu St, Changchun 130026, Jilin, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Microseismic; travel time; imaging;

    机译:微震;旅行时间;成像;

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