FAST-AIC-algorithm micro-seismic signal collecting method

A FAST-AIC, microseismic technology, applied in seismic signal processing, seismology, geophysical measurement, etc., can solve the problems of false detection or missed detection, low calculation efficiency, ignoring correlation, etc. False detection, good anti-noise performance, improved first-arrival pickup accuracy and computational efficiency

Inactive Publication Date: 2017-05-10
JILIN UNIV
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Problems solved by technology

[0006] Although the above-mentioned existing technologies have achieved certain beneficial effects in picking up the first arrival of microseismic signals, the picking process is complicated and the calculation efficiency is low. The correlation between them is easy to cause the problem of false detection or missed detection in the identification

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Embodiment Construction

[0069] In order to enable those skilled in the art to better understand the technical solution in the present invention, the geophone array of the present invention adopts a "meter" shape, such as figure 1 As shown, and taking into account the factors such as the actual stratigraphic changes, each survey line is picked up separately, and the first arrival of multiple microseismic signals on one survey line is picked up at a time.

[0070] A kind of FAST-AIC method microseismic signal first-arrival automatic pick-up method that the present invention proposes is described in detail below in conjunction with accompanying drawing, as figure 2 shown, including the following steps:

[0071] (1) Microseismic data and perforation signal input;

[0072] (2) Using the first arrival time difference file Δt of known high SNR perforation signals i (the difference between the first arrival time of each channel signal and the first arrival time of the reference track) to statically correc...

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Abstract

The invention discloses a FAST-AIC-algorithm-based automatic first-arrival collecting method for micro-seismic signals. The method includes: providing a new identification method of micro-seismic events according to the fact that the propagation path and the travel time information of hydraulic fracturing perforation signals are similar to those of the micro-seismic signals; using a hydraulic fracturing wave detector arrangement manner and a single-channel signal local extreme value to design a precise time window near a micro-seismic triggering moment; using Curvelet conversion to filter data in the precise time window; performing first-arrival collecting in the precise time window through a FAST-AIC algorithm, wherein the FAST-AIC algorithm is obtained by optimizing and converting a traditional AIC algorithm, the linear combination manner of the arithmetic sum and the quadratic sum of a discrete real number sequence is obtained, repeated calculation is reduced, and calculation efficiency is increased greatly. The new method is used to perform first-arrival collecting on analog data and actual hydraulic fracturing micro-seismic monitoring data to verify the feasibility and correctness of the new method. Compared with the first-arrival collecting result of a conventional micro-seismic method, the new method has evident advantages.

Description

Technical field: [0001] The invention relates to a method for automatically picking up microseismic signals, in particular to a method for automatically picking up microseismic signals at first arrival based on the FAST-AIC method in hydraulic fracturing microseismic exploration. Background technique: [0002] Microseismic source location technology is the core of hydraulic fracturing technology, and accurate acquisition of the first arrival of microseismic signals is the key to improving the accuracy of microseismic source location. Usually, the microseismic data of ground observation have a large amount of data, low signal-to-noise ratio, or even completely submerged in noise, which largely restricts the first-arrival picking accuracy of microseismic signals. Accurate identification of microseismic events provides the basis for high-precision first-arrival picking, but it is also very difficult to accurately identify microseismic events due to the uncertainty of the time a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/36
CPCG01V1/288G01V1/30G01V1/362
Inventor 龙云王洪超赵发陈祖斌林君赵玉莹
Owner JILIN UNIV
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