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Reverse travel time imaging of microseismic location

机译:微震位置的反向行程时间成像

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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:微震定位中使用的数据源主要包括微震记录中的到达时间或波形(波场值),并且所使用的算法主要是反转或反向时间成像。在数据源和算法方面,先前可用的方法通常分为三类:行进时间反转,波形反转和基于波场的反向时间成像。在这项研究中,我们提出了一种基于行程时间的新的反向成像方法。从时间不变性开始,我们使用背传播的波场的旅行时间作为成像源位置的数据源。我们直接从一个接收器计算到所有网格点的旅行时间,而不是拾取到达时间,并将其称为反向行程时间字段(RTTF)。使用用于成像的所有接收器的RTTF的方法称为反向行程时间成像(RTTI)。 RTTI图像整个研究区域,因此克服了旅行时间反转中局部最小值的问题。 RTTI预准备RTTF并且不需要在成像期间计算行程时间,这有助于将高计算效率保持为行程时间反转。使用2D声学数值实验测试RTTI中一些干扰因子的有效性,适应性和抗性。

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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