Method for positioning ground micro-seismic based on four-dimensional energy focusing

Abstract

The invention discloses a method for positioning a ground micro-seismic based on four-dimensional energy focusing. The method comprises the following steps of: (a) meshing an underground model by utilizing a mesh of an appointed size according to a working condition; (b) aiming at one appointed mesh, calculating the reaching time that a micro-seismic signal reaches each wave detector in the mesh; (c) adding the amplitudes of effective waves corresponding to the reaching time that the micro-seismic signal reaches each wave detector so as to obtain overlapped energy; (d) obtaining overlapped energy at different reaching time points, and homing maximum values in the overlapped energy into the appointed mesh; (e) repeating the steps (b), (c) and (d) aiming at each mesh so as to obtain a final energy spectrum of the mesh; and (f) filtering an energy value of the final energy spectrum based on a preset threshold so as to position the mesh of which the energy value is larger than the threshold as a micro-seismic effective event point.

Description

technical field [0001] The invention relates to geophysical prospecting microseismic positioning technology, more specifically, relates to a ground microseismic positioning method based on four-dimensional energy focusing. Background technique [0002] In the processing of microseismic data, the key step is to accurately pick up effective microseismic events, and the ultimate goal is to accurately locate the position of effective microseismic events, so as to perform fracture prediction. The microseismic positioning in the well is mainly to determine the hypocenter location by picking up the first arrival waves of effective events and using the first arrival time to perform inversion. However, for the microseismic data received on the ground, the energy of the effective signal is weak and completely submerged in the noise. The signal-to-noise ratio of the microseismic section is extremely low, and it is impossible to pick up the first arrival of the microseismic data. This ...

AI Technical Summary

Problems solved by technology

However, for the microseismic data received on the ground, the energy of the effective signal is weak and completely submerged in the noise. The signal-to-noise ratio of the microseismic section is extremely low, and it is impossible to pick up the first arrival of the microseismic data.

This makes the traditional positioning method not suitable for the positioning of microseismic data

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