A Method of Spatial Correlation Elastic Wave Reflection Waveform Inversion Based on Acoustic Operator

Abstract

The invention provides a spatial cross-correlation elastic wave reflection waveform inversion method based on an acoustic wave operator. Effective utilization of the kinematics information of the multi-wave multi-component reflection seismic data is realized by adopting a spatial correlation function, the height dependence on the complete seismic waveform in a data matching process is reduced, andthe nonlinear problem of inversion is relieved, so that a background model of longitudinal and transverse wave velocity is accurately and efficiently inverted. In the implementation process, the wavepaths of the reflection PP and PS are constructed by utilizing the acoustic wave operator to carry out fractional inversion of the longitudinal and transverse wave velocities; and the distribution inversion strategy can effectively press the coupling effect between the longitudinal and transverse wave velocities, the inversion precision of the two parameters is improved, and meanwhile, the demandof the calculation amount and the memory are remarkably reduced. The obtained longitudinal and transverse wave velocity inversion result can provide an accurate background model for high-resolution and high-precision seismic imaging, and therefore has important significance in solving the processing requirements of actual multi-component seismic data.

Description

technical field [0001] The invention relates to an elastic wave multi-parameter background modeling method, which belongs to the technical field of seismic wave imaging. Background technique [0002] Elastic Wave Full Waveform Inversion (EFWI) can use the observed multi-component seismic data to obtain subsurface elastic parameter models, such as longitudinal and shear wave velocities, density, elastic impedance, anisotropy parameters, etc. important means of exploration and development. However, due to the limited aperture of the actual observation, EFWI can usually only obtain the effective update of the shallow velocity model from the observed first arrival wave, while the information about the middle and deep layer model is reflected in the reflected wave, which is difficult to use. For this reason, some scholars have proposed the elastic wave reflection waveform inversion method (ERWI). This method can realize mid-to-deep update of multiple parameter models by extract...

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Problems solved by technology

[0005] Aiming at the problem of cycle skipping in the existing ERWI method and the dependence on true amplitude migration technology, the present invention introduces a spatial correlation function to make full use of the kinematic information of seismic reflection data, alleviate the problem of cycle skipping and true amplitude migration overdependence of the background model for obtaining P- and S-wave velocities

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