Detection method and system for first arrival of seismic waves

Abstract

The invention discloses a detection method and system for first arrival of seismic waves. The method comprises the steps that a determined first-arrival seismographic record sequence is trained by using a first-order linear regression function and a Kriging interpolation method to obtain the optimal length of a time window; a to-be-detected seismographic record sequence collected by a radiodetector is obtained; a first time window and a second time window following the first time window are established, wherein the lengths of the first and second time windows are the optimal length of the timewindow; data filling is conducted on the left and right sides of the seismographic record sequence; the two time windows are slid from a first piece of data aligned with the seismographic record sequence until the center of the first time window is aligned with the last piece of data of the seismographic record sequence, chi-square test is conducted on data in the first and second time windows every time when the sliding covering a step length of a piece of data, and therefore whether or not there is seismic wave arrived is determined at the position of each piece of data in the seismographicrecord sequence. By means of the system and the method, the influence on detection accuracy caused by noise can be effectively avoided to improve detection accuracy.

Description

technical field [0001] The invention relates to the technical field of first-arrival detection of seismic waves, in particular to a method and system for first-arrival detection of seismic waves. Background technique [0002] Seismic first arrival plays a key role in mineral resource development, earthquake location, and seismic tomography. In oil exploration technology, seismic wave signals can be used to understand geological structures. For example, oil exploration requires the use of artificial seismic signals, and it is particularly important to accurately detect the first arrival moment of seismic waves arriving at the receiver point. [0003] Fundamentally speaking, the first arrival wave of seismic signal contains both seismic signal and noise signal, which is the superposition of the two. The accuracy of first arrival picking is the basic and important link in seismic data processing. Traditional first-arrival picking mainly relies on manual work, but manual pickin...

AI Technical Summary

Problems solved by technology

However, the oil exploration environment in my country is not always ideal, and the noise interference is very serious in areas with complex surfaces, which leads to the fact that the existing methods are not ideal for picking up the first arrival in the case of low signal-to-noise ratio, and the accuracy is not high

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