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Speed model evaluation method based on microseism imaging characteristics

An evaluation method, microseismic technology, applied in seismology, seismic signal processing, geophysical measurement, etc.

Active Publication Date: 2020-04-24
OCEAN UNIV OF CHINA
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Problems solved by technology

[0005] In order to understand the accuracy of the velocity model used in microseismic positioning, the present invention proposes an evaluation method for the velocity model based on the focal position and focus characteristics of microseismic reverse time imaging to solve the evaluation problem of the velocity model used in microseismic monitoring source positioning

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  • Speed model evaluation method based on microseism imaging characteristics
  • Speed model evaluation method based on microseism imaging characteristics
  • Speed model evaluation method based on microseism imaging characteristics

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Embodiment 1

[0074] In the following, the theoretical model test of the present invention will be explained and described in conjunction with specific implementation methods.

[0075] In order to further illustrate the realization idea and process of this method and the effectiveness of the method, a layered velocity model is used to test and explain the results.

[0076] S1: Build a theoretical velocity model, such as figure 2 As shown, the model width is 5000m, the depth is 3000m, and the discrete grid size is 10m 10m.

[0077] S2: Observation system: The microseismic ground observation system is adopted, and 500 geophones are evenly distributed every 10m according to the grid points in the horizontal direction, and the seismic source is located at (2500, 1500) m. The microseismic recording time length is 3s, and the time sampling interval is 0.001s.

[0078] S3: From the theoretical velocity model (see figure 2 ) and the Reich wavelet with a source function of 15 Hz, the acoustic...

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Abstract

The invention relates to a speed evaluation method based on a microseism reverse-time imaging focusing position and focusing characteristics, which belongs to the technical field of microseism monitoring. The method comprises the following steps of: acquiring a microseism observation record, utilizing a given longitudinal wave and transverse wave speed model, adopting finite difference to performreverse time back propagation on the seismic record and obtaining reverse time imaging results of longitudinal wave autocorrelation, transverse wave autocorrelation, longitudinal and transverse wave cross correlation and space-time delay domain and two-dimensional space delay domain longitudinal and transverse wave cross correlation of a zero delay domain, and evaluating the accuracy of a speed model used for reverse time imaging according to the difference of focusing positions of autocorrelation and cross-correlation imaging of the zero delay domains and the change of longitudinal and transverse wave cross-correlation imaging positions and focusing degrees of the space-time delay domain and the two-dimensional space delay domain so as to solve the evaluation problem of the speed model used for microseism monitoring seismic source positioning.

Description

technical field [0001] The invention relates to a speed evaluation method based on the focus position and focus characteristics of microseismic reverse time imaging, and belongs to the technical field of microseismic time reverse imaging. Background technique [0002] Seismic source location is the most important feature and core technology of microseismic monitoring. According to the different properties of microseismic data, the existing microseismic location methods can be basically divided into two categories—location methods based on travel time and location methods based on wavefield imaging. Due to the low signal-to-noise ratio of ground monitoring data, even though there are many methods for noise suppression, effective weak signal extraction and signal-to-noise ratio improvement, it is still difficult to pick up travel time, and a series of human errors will be generated during travel time picking, which will reduce the positioning accuracy. the accuracy. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/34
CPCG01V1/288G01V1/303G01V1/345
Inventor 柳智萱张建中
Owner OCEAN UNIV OF CHINA
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