Geophysical modeling method and device for underground complex structure

Abstract

The invention discloses a geophysical modeling method and device for an underground complex structure, and the method comprises the steps: building a near-surface resistivity model of a research work area; converting the near-surface resistivity model into a near-surface velocity model according to the relationship between the velocity and the resistance; generating an initial velocity model for migration imaging according to the near-surface velocity model and the tectonic geologic model of the research work area; and performing pre-stack depth migration processing on the initial velocity model to obtain a migration imaging result of the research work area. According to the method, the shallow surface structure and the macrostructure model are determined based on the gravity-magnetic-electric-seismic joint and constrained inversion method, and a reasonable speed model can be provided for migration imaging, so that the seismic imaging precision is improved, and the exploration risk is reduced.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a geophysical modeling method and device for complex underground structures. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] In the imaging of complex thrust structural belts, two key problems are usually faced: one is the large-scale pushover movement, which causes a large area of ​​old strata to be exposed to the surface, and the high-speed old strata make it difficult to transmit seismic rays. Difficulty; secondly, multi-stage complex structural movement reformation has formed a very complex underground structure, and deep strata modeling is difficult. In conclusion, how to establish an accurate velocity model is the key to accurate imaging of subsurface struct...

AI Technical Summary

Problems solved by technology

[0006] An embodiment of the present invention provides a geophysical modeling method for underground complex structures, which is used to solve the problem of establishing an initial velocity model for migration imaging from a structural geological model obtained by artificial seismic interpretation in the prior art. Due to large errors, it is difficult to obtain high-quality migration imaging results. The method includes: establishing a near-surface resistivity model in the research area; converting the near-surface resistivity model into a near-surface velocity model based on the The surface velocity model and the structural geological model of the research work area generate an initial velocity model for migration imaging; pre-stack depth migration processing is performed on the initial velocity model to obtain the migration imaging results of the research work area

Images