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Micro-seismic first arrival recognition method and device based on three-component polarization gradient

An identification method and three-component technology, which is applied in the directions of measuring devices, seismology, seismic signal processing, etc., can solve the problems of micro-seismic three-component data amplitude and polarity disorder and disorder

Active Publication Date: 2017-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The inventors found that because the amplitude and polarity of the microseismic three-component data are chaotic and disorderly, in the prior art, only on the basis of a large amount of early processing of the microseismic three-component data can the ability to identify the first arrival of microseismic events be improved

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  • Micro-seismic first arrival recognition method and device based on three-component polarization gradient
  • Micro-seismic first arrival recognition method and device based on three-component polarization gradient
  • Micro-seismic first arrival recognition method and device based on three-component polarization gradient

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Embodiment 1

[0020] figure 1 A flow chart of a microseismic first arrival identification method based on three-component polarization gradients according to an embodiment of the present invention is shown, the method comprising:

[0021] Step 101, based on the original three-component data X 0 (t), Y 0 (t), Z 0 (t) Construct the instantaneous three-component covariance matrix C XYZ (t);

[0022] Step 102, based on the instantaneous three-component covariance matrix C XYZ (t) constructing the instantaneous polarization function PF(t);

[0023] Step 103, constructing a target gradient function Δ(t) based on the instantaneous polarization function PF(t); and

[0024] Step 104, by comparing the target gradient function Δ(t) with a given threshold K to identify the first arrival time of the microseismic.

[0025] Microseismic signals have pairwise coupling relationship, that is, polarization relationship, on the three-component X, Y, and Z vector data, but random signals other than effec...

Embodiment 2

[0057] The invention also discloses a microseismic first arrival identification device based on the three-component polarization gradient. In this embodiment, the device includes: a covariance matrix construction unit, used to base on the original three-component data X 0 (t), Y 0 (t), Z 0 (t) Construct the instantaneous three-component covariance matrix C XYZ (t); Polarization function construction unit, for based on the instantaneous three-component covariance matrix C XYZ (t) constructing an instantaneous polarization function PF (t); a target gradient function calculation unit for constructing a target gradient function Δ (t) based on the instantaneous polarization function PF (t); and a microseismic initial arrival time identification unit, It is used to identify the first arrival time of the microseismic by comparing the target gradient function Δ(t) with a given threshold K.

[0058] In one example, based on the original three-component data X 0 (t), Y 0 (t), Z 0...

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Abstract

A micro-seismic first arrival recognition method and device based on the three-component polarization gradient are disclosed. The method may include the steps of constructing an instantaneous three-component covariance matrix CXYZ(t) based on original three-component data; constructing an instantaneous degree of polarization function PF(t) based on the instantaneous three-component covariance matrix CXYZ(t); constructing a target gradient function [delta](t) based on the instantaneous degree of polarization function PF(t); and recognizing the micro-seismic first arrival time by comparing the target gradient function [delta](t) with a given threshold value K. The method and device of the invention directly start with the original micro-seismic three-component data and realize the quick and automatic recognition of the micro-seismic first arrival by constructing the target gradient function of the instantaneous polarization function.

Description

technical field [0001] The invention relates to the field of microseismic three-component signal processing, and more specifically, to a microseismic first arrival identification method based on a three-component polarization gradient and a microseismic first arrival identification device based on a three-component polarization gradient. Background technique [0002] Accurately picking the effective first arrival time of an event is of great significance for the localization of the source of microseismic events and the interpretation of the source mechanism. It is very time-consuming to manually check the seismogram to pick up the first arrival, and because of the subjectivity of manual operation, even professionals will pick up different first arrivals at different times. Therefore, research on the automatic identification of three-component microseismic first arrivals and improve the accuracy of picking time has become one of the key technologies in microseismic processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/288
Inventor 余波
Owner CHINA PETROLEUM & CHEM CORP
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