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Ground microseism positioning method and system combining seismic source mechanism inversion

A technology of focal mechanism and positioning method, applied in seismology, seismic measurement, seismic signal processing, etc., can solve the problem of low positioning accuracy of micro-seismic events, achieve the effect of solving the radiation pattern problem, improving accuracy, and avoiding positioning accuracy

Active Publication Date: 2021-01-12
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a ground microseismic positioning method and system combined with focal mechanism inversion for the above-mentioned defects of the prior art, aiming at solving the problem of low positioning accuracy of microseismic events in the prior art

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  • Ground microseism positioning method and system combining seismic source mechanism inversion
  • Ground microseism positioning method and system combining seismic source mechanism inversion
  • Ground microseism positioning method and system combining seismic source mechanism inversion

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[0059] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0060] Please also see Figure 1-Figure 8 , the present invention provides some embodiments of a ground microseismic positioning method combined with focal mechanism inversion.

[0061] Such as figure 1Shown, a kind of ground microseismic localization method of joint source mechanism inversion of the present invention comprises the following steps:

[0062] S100. According to the observation system and the target area, the theoretical travel time table is determined by using the P-wave and S-wave velocity models.

[0063] Specifically, the observation system refers to the system for o...

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Abstract

The invention discloses a ground microseism positioning method and system combining seismic source mechanism inversion, and the method comprises the steps: determining a theoretical travel time tableby employing a P-wave and S-wave speed model according to an observation system and a target region; obtaining the amplitude of the microseism data channel according to the theoretical travel time table, and correcting the polarity of the corresponding amplitude according to the theoretical prediction polarity before superposition; and determining the position of the seismic source according to the amplitude superposition energy after polarity correction. According to the microseism positioning method combining seismic source mechanism rapid inversion, waveform information of P waves and S waves in data is utilized, seismic source mechanism solution inversion calculation is rapid and stable, the radiation pattern problem caused by a complex seismic source mechanism can be effectively solved, and the scanning superposition positioning precision is improved; and moreover, the method can automatically detect and position the microseism event without manually picking up the first arrival of the P wave and the S wave, thereby further avoiding the influence of a picking error on the positioning precision.

Description

technical field [0001] The invention relates to the technical field of microseismic monitoring, in particular to a ground microseismic location method and system combined with focal mechanism inversion. Background technique [0002] Microseismic monitoring can be applied to engineering technology fields such as hydraulic fracturing shale gas development, geothermal system development, and mining mining, among which microseismic positioning is the core technology. At present, the traditional method based on seismic phase arrival time picking is still one of the most widely used methods for microseismic location. The localization method is usually difficult to achieve satisfactory results even if it takes a lot of work to pick it up. In recent years, researchers have developed a positioning method and technology based on diffraction scanning stacking by referring to the principle of migration imaging in reflection seismic, and have begun to apply it to the field of ground mic...

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Application Information

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IPC IPC(8): G01V1/00G01V1/28G01V1/34G01V1/36
CPCG01V1/288G01V1/362G01V1/364G01V1/345G01V2210/21G01V2210/53G01V2210/63G01V2210/74G01V2210/65G01V1/01
Inventor 徐锦承张伟李俊伦
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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