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Deep Mine Wavefront Reconstruction Using True 3D Sparse Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2016 - First Conference on Geophysics for Mineral Exploration and Mining, Sep 2016, Volume 2016, p.1 - 5
Abstract
Summary
Extrapolation of seismic wavefields is useful for determining the location of the seismic source, as well as analysing how the wavefront propagates given different local conditions. One type of such extrapolation is known as reverse-time migration, which is used successfully for various modelling tasks. In a typical mine setting reverse-time migration struggles due to microseismic monitoring arrays being sparse. Sparsity of data makes it difficult to achieve accurate results from extrapolation, so a way of overcoming this is explored. Given the true 3-dimensional geometry within a microseismic array, a method of reconstructing a wavefront using sparse data is introduced. The radial component of each seismic trace is time-shifted to a reference radius, followed by an interpolation on the sphere with this reference radius. This densely sampled wavefront is then used as a starting point for reverse-time migration, and can thus be used to analyse wave characteristics of interest such as peak particle velocities and accelerations. This can lead to a better assessment of hazard, and ultimately a safer working environment.
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