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A first-arrival automatic picking method

An automatic picking and seed point technology, applied in seismology, instruments, measuring devices, etc., can solve the problem of first-arrival wave energy characteristics, waveform characteristics, large changes in phase characteristics, affected by noise, first-arrival wave automatic picking method accuracy and efficiency Unable to meet requirements, etc.

Active Publication Date: 2020-06-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, under complex near-surface conditions, due to the large changes in the energy characteristics, waveform characteristics, and phase characteristics of the first arrival wave, and are often affected by noise, the accuracy and efficiency of the first arrival automatic picking method still cannot meet the requirements.

Method used

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  • A first-arrival automatic picking method

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Embodiment Construction

[0032] The present invention will be described in more detail below with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0033] The following references figure 1 The method for automatically picking up first arrivals according to an exemplary embodiment of the present invention will be described in detail.

[0034] The method mainly includes:

[0035] Step 1: Identify a seed point in the first area of ​​the seismic record as the starting point for growth.

[0036] The first step is to find a seed point as the starting point of growth for each region that needs to be divided. For seismic ...

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Abstract

The invention discloses an automatic first break picking method. The method comprises steps: 1) a seed point is determined in a first area of a seismic record as a starting point of growth; 2) sequential scanning is carried out on seismic traces, and points with the same or similar properties in a neighborhood around the seed point are merged to the first area; and 3) the boundary of the first area is searched and is determined as a first break time point. A new seismic attribute trace is formed based on the local similarity of the seismic traces, the new seismic attribute trace and the seismic traces are merged to form a merged trace, the merged trace is then used as input, the area before the first seismic break is determined by using an area growth method, the first break is further determined, and the method has the characteristics of strong anti-noise ability and high picking accuracy.

Description

technical field [0001] The invention relates to the field of seismic exploration and development of oil and gas and coalbed methane, and more particularly, to a method for automatically picking up first arrival waves. Background technique [0002] Static correction is a key technology to improve the signal-to-noise ratio and vertical resolution of stacking profiles. The conventional refracted wave static correction is based on the assumption of a horizontally uniform layered medium. When the surface fluctuation of the exploration area is large, and the near-surface thickness and velocity change are complex, the refraction static correction cannot be applied. The tomographic static correction can invert the near-surface velocity model of any medium. It is the most ideal static correction method for solving complex surface static correction, and it is also the most commonly used method. The first pick is the first step in the tomographic static correction process, and its ac...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/362G01V2210/53
Inventor 刘百红郑四连宋志翔
Owner CHINA PETROLEUM & CHEM CORP
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