Method for increasing automatic pickup efficiency of geological data first-motion waves

Abstract

The invention belongs to geological data processing and in particular relates to a method for increasing the automatic pickup efficiency of geological data first-motion waves. The method comprises the following steps of: selecting sampling points from geological data, wherein the lengths of the sampling points are time windows; calculating quadratic sums of the length geological data of the sampling point; according to a result, calculating specific values of the quadratic sums; searching a maximum value in the specific values, wherein the sampling point corresponding to the maximum value is a first-motion time of the first-motion waves; carrying out median filtering, and calculating the absolute value of two first-motion time before and after filtering; and mutually processing two parts of an error threshold value, and adding the specific values together, wherein the sampling point corresponding to the maximum value in the specific values is an accurate first-motion time sampling value. Compared with conventional automatic pickup, the method has the advantages of high precision and strong noise resisting capacity and can be used for meeting the requirement on the first-motion wave pickup precision in a seismic prospecting technology, reducing modifications to the first-motion wave pickup by manpower and increasing the automatic pickup efficiency of the first-motion waves.

Description

technical field [0001] The invention relates to seismic data processing of geophysical exploration, belongs to the field of seismic data processing using static correction technology to improve resolution, and is a method for improving the efficiency of automatic first-arrival wave picking of seismic data. Background technique [0002] In seismic data processing, many static correction techniques need to use first arrival information. The quality of first arrival wave picking directly restricts the application effect of these static correction techniques, and the application effect of static correction techniques directly affects the resolution of seismic data processing. How to pick up the first arrival wave more accurately is particularly important in seismic data processing. [0003] When collecting seismic data in the field of seismic exploration, due to the influence of surface conditions and different environments, the background noise of the first arrival wave of the ...

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Problems solved by technology

[0004] At present, the relatively mature first-arrival picking technologies are the energy ratio method and the maximum amplitude method. These two first-arrival picking methods are relatively weak to the first-arrival background noise, and the seismic data picking effect of relatively strong first-arrival energy is better. With the continuous development of seismic exploration technology, the exploration area gradually penetrates into mountainous areas, neighboring and hilly areas. In these areas, the formation rocks are often exposed, the energy of the first arrival wave is very weak, and the background noise is strong. The energy ratio method and the maximum amplitude method first arrival Wave picking technology is not efficient in picking up the first arrival of this kind of seismic data, and the labor cost is high

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