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...

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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

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