A multi-scale ground microseismic reverse time interferometric positioning method

A positioning method and micro-seismic technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as strong imaging noise, interference source location determination, etc., and achieve the effect of improving focus and resolution

Inactive Publication Date: 2021-04-02
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0020] It can be seen from Fig. 3(a) and Fig. 3(b) that the sparse observation system leads to strong imaging noise in reverse time interferometric positioning imaging, and there are obvious imaging artifacts in shallow areas, which are more serious in three-dimensional complex media , which interferes with the determination of the true source location

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  • A multi-scale ground microseismic reverse time interferometric positioning method
  • A multi-scale ground microseismic reverse time interferometric positioning method
  • A multi-scale ground microseismic reverse time interferometric positioning method

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Embodiment Construction

[0066] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0067] refer to Figure 4 , the multi-scale ground microseismic reverse-time interferometric positioning method provided by the present invention comprises the following steps:

[0068] Step 1: Read in the ground microseismic wave field records, observation system files, velocity model files and related parameter files. The related parameter files include: the number of grid points involved in the calculation of the seismic work area, grid spacing, sampling frequency, and source wavelet reference frequency and earthquake recording time.

[0069] Step 2: Taking advantage of the characteristic that the random noise energy gradually diverges after multi-scale decomposition, while the effective signal energy is gradually prominent, time-frequency analysis techniques such as Variational Mode Decomposition (VMD) (or Empirical Mode Decomposition, S-t...

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Abstract

The invention discloses a multi-scale ground microseism inverse time interference positioning method. The inverse time positioning and multi-scale variational mode decomposition are combined, the original microseism data is decomposed into multiple scale domains with different vibration characteristics through the multi-scale decomposition technology, the noise amplitude is gradually reduced alongthe increasing of the decomposition scale, the amplitude of the effective signal is gradually increased, the proportion of the background noise can be reduced, and then the precision of the seismic source positioning is improved; furthermore, the original microseism data is decomposition into multiple scale domains through the multi-scale variational mode decomposition, the characteristics of theeffective signals extracted from multiple scales are enhanced, the disadvantage of the sampling information caused by a sparse observation system can be remedied; the product of the effective scale inverse time interference positioning can improve the focusing and resolution of an inverse time interference positioning imaging ellipse, and then an imaging illusion is suppressed.

Description

technical field [0001] The invention relates to a ground microseismic positioning method, in particular to a multi-scale ground microseismic reverse-time interference positioning method, which belongs to the technical field of microseismic monitoring. Background technique [0002] In recent years, microseismic monitoring technology has been widely used in hydraulic fracturing monitoring of tight oil and gas reservoirs, mine rock burst monitoring, carbon dioxide geological storage monitoring and conventional oil and gas field injection-production induced seismic monitoring. Especially in the development of tight oil and gas reservoirs, microseismic hydraulic fracturing monitoring is the only far-field technique capable of imaging the geometry of induced fractures. Through real-time microseismic monitoring of the temporal and spatial distribution of the source, the geometric occurrence of induced fractures, the change of in-situ stress and the connectivity of fracture grids ca...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/30G01V2210/1234G01V2210/6161G01V2210/65
Inventor 李萌李辉峰杨飞龙李欣欣
Owner XI'AN PETROLEUM UNIVERSITY
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