Method for improving precision and efficiency of first-arrival wave pickup

Abstract

The invention relates to a method for improving the precision and the efficiency of first-arrival wave pickup in oil seismic exploration. The method comprises the following steps: selecting the first-arrival time of a seed gun line and a seed shot; dividing an observation region covered by the seed shot into small sub-regions; carrying out elevation correction on the first-arrival time of each track; obtaining a beeline slope through fitting; using the reciprocal of the slope as the visual speed of a section first-arrival curve; establishing a visual speed field; carrying out first-arrival pickup through the non-seed shot first-arrival time calculated by the seed shot; and gradually completing the first-arrival pickup of the whole shot line to further complete the first-arrival time pickup of the whole working region. The method adopts batch pickup, reduces the workload of manual intervention and improves the efficiency and the accuracy of the first-arrival time pickup.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration, which is a seismic data processing technology, in particular a method for improving the accuracy and efficiency of first-arrival wave picking. Background technique [0002] First arrival is an important attribute of seismic data, which is often used in data processing to solve the static correction problem of seismic data. At present, there are many methods for calculating field statics by using first arrival time, and the accuracy of statics calculated by these methods depends on the accuracy of first arrival picking. The current first-arrival picking method usually uses one shot as a unit, manual picking, because each shot needs to be manually picked up, the picking workload is heavy, and the efficiency and accuracy of first-arrival picking are very low; With one detection line as the unit, manually pick up, for a data of 6 lines and 4 shots, it is equivalent to picking up 20 two-d...

AI Technical Summary

Problems solved by technology

The current first-arrival picking method usually uses one shot as a unit, manual picking, because each shot needs to be manually picked up, the picking workload is heavy, and the efficiency and accuracy of first-arrival picking are very low; With one detection line as the unit, manually pick up, for a data of 6 lines and 4 shots, it is equivalent to picking up 20 two-dimensional survey lines, and the workload is huge; pick up in batches, and then manually modify the data of each shot, This method is not accurate enough for slightly complex data. If you want to achieve high-precision picking, you need to make multiple modifications for each shot, and the workload of picking is huge.

These conventional first-arrival picking methods do not use constrained picking, that is, the first-arrival time picked up by the last shot is not used, so the amount of seismic data involved in the calculation is large, the picking speed is slow, and the first-arrival picking accuracy is not high

[0003] With the development of 3D continuous slices and high-density acquisition technology, the amount of data to be processed increases, and the current first-arrival time picking method has the disadvantages of low picking efficiency and low picking accuracy

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