Static correction method and static correction device for converted wave

Abstract

The invention relates to a static correction method and a static correction device for a converted wave. The method comprises the following steps: carrying out pretreatment on multi-wave seismic data; obtaining the correcting value of field shot points and the correcting value of geophone; correcting the seismic data; carrying out separation and speed analysis on the seismic data after correction to generate the propagation speed of the seismic data; carrying out correction and excision operation on a trace gather to generate dynamic correction trace gather data; converting the CMP trace gather data of PP wave into PS domain, overlapping the CMP trace gather data of PP wave converted into the PS domain; selecting a goal layer on the overlapped seismic data, and carrying out position pickup on the goal layer to obtain position time; presetting a reference plane, and calculating the time difference of the position time and the preset horizontal reference plane time; correcting the dynamic correction trace gather data onto the preset reference plane, and generating the PP wave dynamic correction trace gather data after construction leveling; carrying out geophone trace gather separation and trace gather overlapping on the dynamic correction trace gather data after construction leveling, and generating geophone trace gather overlapped data after construction leveling.

Description

technical field [0001] The invention relates to the technical field of geophysical multi-wave seismic exploration, in particular to a converted wave static correction method and device. Background technique [0002] Multi-wave seismic exploration is an exploration technology that uses multiple information such as compressional waves, shear waves, and converted waves to carry out fine exploration of oil and gas reservoirs. This technology can identify thin interbeds, small faults, and low-amplitude structures, accurately predict reservoir boundaries and reservoir properties, monitor fluids, and even be directly used for oil and gas prediction. Since the signal-to-noise of converted wave seismic data is lower than that of longitudinal waves, the amount of static correction is larger than that of longitudinal waves. Especially in mountainous areas, converted wave static correction has become one of the key technologies that affect the effect of converted wave seismic exploratio...

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Problems solved by technology

The second prerequisite is that for converted wave exploration areas with large structural fluctuations, the static correction effect of this method is not ideal, mainly because the CRP gathers are not horizontal in geological conditions with large structural fluctuations, and cannot be accurately The in-phase superposition of CRP, the signal-to-noise ratio of the effective signal after CRP superposition is low, it is impossible to pick up the horizon or the accuracy of picking the horizon is not high

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