Co-attitude gather azimuth analysis and correction method and device

Abstract

A common-posture gather azimuthal angle analysis and correction method and device, the method comprising: identifying a posture of a detector in a common-detection-point gather, and extracting seismic data having the same posture therefrom to form a common-posture gather (102); performing azimuthal angle deviation value analysis on each common-posture gather and acquiring an azimuthal angle deviation value of the detector in a corresponding posture therefrom (103); performing azimuthal angle correction on three-component seismic data corresponding to the detector according to the azimuthal angle deviation value of the detector of each common-posture gather (104); and performing dip angle correction on the three-component seismic data subjected to the azimuthal angle correction according to a dip angle provided by a seismic acquisition system so as to obtain final three-component seismic data (105). Common-posture gathers are proposed, and azimuthal angle analysis and correction are carried out on different common-posture gathers independently; meanwhile, a theoretical error of dip angle correction and azimuthal angle correction corresponding to a matrix operation is overcome; therefore, by means of the method, high-fidelity transverse-wave seismic data and longitudinal-wave seismic data can be obtained.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a method and device for analyzing and correcting the azimuth angle of a common attitude gather in multi-wave seismic exploration. Background technique [0002] Multi-wave seismic exploration, also known as converted wave seismic exploration, or three-dimensional three-component (3D3C) seismic exploration, is one of the two main branches of seismic exploration in the field of applied geophysics; the other main branch technology is longitudinal wave seismic exploration, which It only receives single-component seismic exploration observation data, which belongs to scalar seismic exploration. Specifically, multi-wave seismic exploration uses a three-component geophone to simultaneously receive seismic exploration observation data of three components such as Z component, X component and Y component. The polarization directions of the widely used three-component geophones are mutual...

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Problems solved by technology

However, this is inconsistent with the matrix operation theory. Only when there is no azimuth angle deviation or the azimuth angle deviation is small, and the azimuth angle correction matrix can be approximated as a unit matrix, can the commutation law of matrix operation be satisfied, and the inclination angle correction can be performed first, and then the azimuth angle correction can be performed. Correction

[0007] The inventor found in the research that due to the above two factors in the prior art, the fidelity of vector seismic data in multi-wave seismic exploration is affected

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