Imaging system and imaging method for well earthquake using hammer head of down-hole hammer as focus

Abstract

The invention discloses an imaging system and an imaging method for a well earthquake using a hammer head of a down-hole hammer as a focus, and belongs to the technical field of engineering seismic exploration. A low-energy focus such as an electric spark is replaced by high-energy excitation of the hammer head of the down-hole hammer, and distant earthquake signals can be received; in the imaging method for the well earthquake, the accuracy on reflection of an object is increased along with reduction of the distance between the focus and the object, the down-hole hammer drills the ground downwards gradually, and the distance between the hammer head and the object is shorter than the distance between the ground and the object, so that the resolution ratio of the earthquake method of exciting the focus in a hole is high; and more importantly, along with drilling of the down-hole hammer, the velocity distribution condition of elastic waves of media surrounding a drilling hole is obtained, a detector can be optionally arranged according to conditions of the ground, the coverage area surrounding the drilling hole is large, a three-dimensional image can be formed, and visual expression can be realized.

Description

technical field [0001] The invention belongs to the technical field of engineering seismic exploration, and relates to a well ground seismic tomographic imaging method, in particular to a well ground seismic imaging system and a tomographic imaging method using a down-the-hole hammer head as a seismic source. Background technique [0002] At present, the division of strata and the identification of rock mass weakness in engineering surveys mostly use seismic exploration methods. However, there are two problems in practical application: ①Engineering seismic survey is subject to cost and safety considerations, dynamite sources are rarely used, and sledgehammers or electric sparks are mostly used, so the energy is relatively weak , so the detection distance is small; ②The seismic source of the surface seismic imaging method is far away from the target body, and the resolution of this method is lower than that of the borehole seismic source method. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0002] At present, the division of strata and the identification of rock mass weakness in engineering surveys mostly use seismic exploration methods. However, there are two problems in practical application: ①Engineering seismic survey is subject to cost and safety considerations, dynamite sources are rarely used, and sledgehammers or electric sparks are mostly used, so the energy is relatively weak , so the detection distance is small; ②The seismic source of the surface seismic imaging method is far away from the target body, and the resolution of this method is lower than that of the borehole seismic source method

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