High-resolution underground structure amplitude-preserving imaging method

Abstract

The invention discloses a high-resolution underground structure amplitude-preserving imaging method, and the method comprises the steps: obtaining an initial imaging result through reverse time migration, carrying out the Born forward modeling on the basis of the initial imaging result to obtain simulation seismic data, and carrying out the reverse time migration on the simulation data to obtain asecondary migration imaging result; then carrying out curvelet transformation on the two imaging results, and carrying out point-by-point estimation in a curvelet domain, wherein Wiener solutions matched with the two groups of curvelet coefficients serve as solutions of a matched filter; and finally, acting the estimated matching filter on the initial imaging result to obtain a high-resolution amplitude-preserving imaging result. The method aims at solving the problems that imaging results are fuzzy and amplitude is unbalanced due to the fact that a reverse time migration imaging operator isan accompanying operator of a forward operator. And migration imaging is performed again on the initial migration imaging result, a matched filter of two migration imaging results in a transform domain is searched by utilizing curvelet transform to serve as approximation of an inverse Hessian operator, and the matched filter acts on the initial imaging result so as to achieve the effect of improving the imaging quality.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to an imaging method for underground structures, in particular to a high-resolution imaging method for amplitude-preserving underground structures. Background technique [0002] In the field of seismic exploration technology, reverse time migration (RTM) is currently the most advanced subsurface structure imaging technology. Reverse time migration uses the two-way wave wave equation to describe the propagation law of seismic waves in the ground, and can use various types of waves for imaging, such as prismatic waves, rotary waves, etc., and can image any structure without limitation of dip angle, such as the upside-down body imaging. However, reverse time migration is still an adjoint operator to the forward operator, which can only produce an approximation of the subsurface reflectivity model. As a result, seismic imaging sections generated by RTM are blurred and have u...

AI Technical Summary

Problems solved by technology

[0004] However, the scale of the Hessian operator is huge, and it is difficult to obtain it in practical applications, let alone the inverse operator of the Hessian operator

How to estimate the inverse operator of the Hessian operator is a hot topic and has not been properly solved

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