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Combined ocean bottom seismograph azimuth angle automatic identification device and method

A technology of automatic identification and azimuth, applied in seismology, measuring devices, seismic signal recording, etc., to improve the efficiency of data preprocessing

Active Publication Date: 2020-06-09
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

But there is no automatic azimuth identification method for natural source seismic data of combined submarine seismographs

Method used

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  • Combined ocean bottom seismograph azimuth angle automatic identification device and method
  • Combined ocean bottom seismograph azimuth angle automatic identification device and method
  • Combined ocean bottom seismograph azimuth angle automatic identification device and method

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Embodiment Construction

[0037] The specific embodiment of the present invention is described below in conjunction with accompanying drawing:

[0038]This embodiment provides a method for self-identifying azimuth angles of natural source seismic data of a combined submarine seismograph. Azimuth refers to the angle between the second horizontal component of the combined ocean bottom seismograph seismometer and geographic east. The input data are natural source background noise sequences recorded by the original three-component seismometers of any two combined ocean bottom seismometers. Firstly, the three-component Green's function between the pair of instruments is obtained based on the noise cross-correlation algorithm. Then multiple initial azimuths are obtained by using multiple instruments to obtain the maximum value of the Green's function correlation coefficient of the horizontal component of the rotation in the range of 0° to 360°. Finally, multiple initial azimuths are screened using the data...

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Abstract

The invention discloses a combined ocean bottom seismograph azimuth angle automatic identification device and method, and belongs to the technical field of ocean seismic exploration. According to themethod, natural source background noise sequences recorded by original three-component seismometers of any two combined type ocean bottom seismometers are used as input data. Firstly, a three-component Green function between the pair of instruments is solved based on a noise cross-correlation algorithm. A plurality of initial azimuth angles are then obtained by using Green function correlation coefficient maxima of the rotating horizontal components of a plurality of instrument pairs in the range of 0 DEG to 360 DEG. And finally, the plurality of initial azimuth angles are screened by utilizing a data window and a statistical analysis result to confirm a final azimuth angle. Meanwhile, the invention discloses the device for automatically identifying the azimuth angle of the natural sourceseismic data of the combined type ocean bottom seismographs. According to the invention, the natural source earthquake observation data preprocessing rate of the combined type ocean bottom seismographs in ocean energy and resource development monitoring can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of marine seismic exploration, in particular to a device and method for automatically identifying the azimuth angle of natural source seismic data of a combined submarine seismograph. Background technique [0002] Marine seismology is the core technical means for on-site monitoring of marine energy and resource development. As a new type of marine seismic acquisition equipment, the combined seabed seismograph has the advantages of low cost, high efficiency, and dense deployment, especially the miniaturized integrated design of the instrument integrating data acquisition and seismometer, so it can be widely used in marine energy Seismic monitoring with resource development. [0003] In the development of marine energy, especially in the development of emerging seabed shale gas, high-pressure water injection is required to fracturing the shale gas reservoir to achieve exploitation. The fracturing process requ...

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Application Information

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IPC IPC(8): G01V1/38G01V1/24G01V1/36
CPCG01V1/247G01V1/362G01V1/3808
Inventor 王元游庆瑜郝天珧胡耀星赵春蕾张妍徐锡强
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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