| The longitudinal wave data collected by conventional offshore streamers has been difficult to meet the needs of fine exploration.Therefore,in recent years,four-component submarine cable collection and submarine node collection have received more and more attention.The four-component seismic acquisition is more common in the submarine cable industry,including a waterfront longitudinal component and three terrestrial components.The collection efficiency of submarine cables is generally 5% to 10% of the number of streamers under the same conditions,and the price is expensive.This requires field quality control in the field to ensure that the collected data is normal.Therefore,it is necessary to develop a four-component data quality control and processing flow for submarine cables that is suitable for field implementation at the level of ship computer equipment.According to the characteristics of field quality control,this paper has formed a rapid on-site dual-inspection combined on-site processing flow and a simple conversion wave on-site processing rapid imaging process.Aiming at the ghost wave problem of the data cable of the submarine cable acquisition,a matching factor of double matching and de-ghost wave technology based on CGG processing software is formed.The implementation of this process can quickly evaluate the broadband effect of dual detection.In addition,for the problem of low frequency component after the combination of the conventional double check,the principle and formula of the signal received by the Z component of the land test are analyzed and deduced,and the problem that the accelerometer is inconsistent to different frequencies is determined from the theoretical level.An improved integration-based double check merge method can better compensate for the low frequency missing problem.For the processing of converted wave data,the conventional superposition needs to use the iterative method to realize the extraction of the common conversion point.In this paper,the method of asymptotic line gather extraction is adopted,which can generate the superposition profile at the first time in the field to achieve the purpose of quality control.For the problem of converted wave imaging,this paper also explores and studies,and finally forms a set of converted wave imaging technology flow based on multi-parameter model.The processing results of practical seismic data show that the method proposed in this thesis can be used to realize the separate imaging of P-wave and converted wave in the same area,and the converted wave imaging results have certain advantages over the P-wave imaging results of peg-leg multiple suppression,which partially solves the problem of multiplicity of solutions of conventional P-wave imaging. |
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