Combination coding control method and system for air gun

Abstract

The system discloses an air gun array coding control method and system. The air gun excitation fixed delay reference time is set; the signal sampling frequency and the sampling length are set at the same time, and according to the signal sampling frequency and the sampling length, complete air gun array data are acquired; according to the mechanical friction delay time of each air gun, corresponding air gun array valid data in a fixed reference time range when an air gun solenoid valve opens are intercepted from the complete air gun array data; according to the air gun excitation fixed delay reference time, standard Gaussian pulse signals are simulated and generated; a sliding window cross-correlation technology is used to carry out cross-correlation on the air gun array valid data of eachair gun and the standard Gaussian pulse signals respectively, and the solenoid valve opening delay errors corresponding to each air gun in the air gun array are calculated and obtained; and finally,according to the air gun solenoid valve opening delay errors, air gun signals of the corresponding air gun are corrected synchronously, and the coding time is more accurate.

Description

Technical field [0001] The invention relates to the technical field of seismic exploration, in particular to an air gun combination coding control method and system. Background technique [0002] As a green and environmentally friendly seismic source with low frequency, strong energy and good repeatability, air guns are widely used in the field of seismic exploration. In the field of earthquake prediction, the dynamic monitoring of deep-seated media is different from the high-resolution petroleum exploration, which requires the seismic source to have higher energy and lower frequency. In order to obtain better wavelet characteristics of the air gun, increase the energy output of the main pulse of the air gun source, and effectively suppress the vibration of the bubble, the researchers proposed the air gun array code based on the attenuation mode and vibration period of the bubble vibration, the bubble vibration model theory and the coding principle Control Method. Studies have ...

AI Technical Summary

Problems solved by technology

Although this method can solve the problems encountered before, how to define the main pulse width condition is a new problem, and the width can only be set according to experience; the other is to combine the data collected by each gun with The data of the first gun is cross-correlated to extract the time difference between each gun and the first gun. However, due to the different performances of different types of air guns, the signal forms recorded by the gun pressure sensor are different, and the coding time difference is extracted by using the cross-correlation method. time resolution is not enough

Images