Abstract:The deep-hole dynamite source is usually adopted for seismic exploration in mountain areas due to the undulating terrain. In the process of drilling shot holes, the connector comprised of the diesel (gas) engine, drilling bit, and support equipment forms a noise source that continuously vibrates on the surface. The near-surface vibration generated radiates to the surroundings with the derrick at its center, and the law of this vibration closely correlates with the near-surface velocity structure. Therefore, this paper proposes a me-thod of utilizing this type of vibration signal while drilling to acquire the near-surface structure through inversion. Specifically, geophones are arranged on a radiation line centering around the connector to continuously record the vibration signals, and then each signal is processed through mean removal, detrending, time-domain normalization, and spectral whitening. Finally, the one closest to the connector of the drilling rig is cross-correlated with the rest of the signals. The time derivative of the correlation result is the empirical Green's function of the seismic wave field generated by the drilling rig vibration. The multichannel analysis is employed to extract the surface wave dispersion curve to obtain the near-surface velocity structure through inversion. The analysis of the pilot field experiment shows that the extracted pseudo surface wave by the proposed method is highly close to the surface wave acquired by the multichannel transient method, and the near-surface velocity structure obtained through inversion is also consistent with the uphole survey measurement.
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