Evaluation method and device for seismic exploration data acquisition and observation system in complex structural areas

Abstract

The invention provides an evaluation method and an evaluation device for a seismic exploration data acquisition and observation system in a complex structure area. The method comprises the following steps: establishing a geological model, multiple sets of observation systems and a full waveform inversion initial model; obtaining observation data according to the observation systems and the geological model, obtaining a seismic wave field and simulation data according to the observation systems, forward modeling parameters and the initial model and calculating observation data residual errors between the observation data and analog data; obtaining an inverse-time propagation wave field according to the initial model and inverse-time observation data residual errors; obtaining the velocity update amount and updating the initial model by using the seismic wave field and the inverse-time propagation wave field; obtaining a final inversion velocity model when the velocity update amount meets the requirements; calculating multiple variances of the velocity approximation degree of the final inversion velocity model and the geological model, corresponding to the multiple sets of observation systems, wherein the observation system corresponding to the minimum variance is optimal. According to the scheme, full waveform inversion is applied to the evaluation of an observation system in acomplex high steep structural area, and the advantages and disadvantages of different observation systems can be effectively evaluated.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to an evaluation method and device for seismic exploration data collection and observation systems in complex structural areas. Background technique [0002] The design and optimization of seismic exploration data acquisition and observation systems in complex structural areas, especially overthrust nappe areas or salt-bearing dome structural areas, has been a key research issue for many experts and scholars in recent years. On the one hand, the complex seismic wave field generated by complex geological structures makes it difficult for existing velocity analysis methods to adapt; on the other hand, high-speed geological bodies or salt mounds hinder the penetration of seismic waves, forming a shadow area for seismic wave illumination. This will inevitably lead to poor imaging of some parts of the complex geological structure when the same seismic exploration data acq...

AI Technical Summary

Problems solved by technology

However, when the migration velocity model is accurate, the sensitivity of pre-stack depth migration imaging to seismic exploration data acquisition and observation system parameters such as maximum offset, track spacing, and shot density is poor, and it is also difficult to accurately evaluate the seismic exploration data acquisition and observation system. pros and cons

With the continuous improvement of computer technology, the full waveform inversion method has attracted more and more attention, and the technology has gradually matured. However, everyone focuses on the full waveform inversion method itself, and rarely considers the quality of data acquisition and full The relationship between waveform inversion

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