A Polar Direct Envelope Inversion Method Based on Seismic Trace Attribute Analysis

Abstract

The invention discloses a direct envelope inversion method with polarity based on seismic trace attribute analysis, specifically: step 1, setting shot points and receiver points, and collecting and obtaining observation data u obs (t,x r ; x s ); Step 2, constructing a rectangular grid geological model; Step 3, the initial velocity model v of a given velocity model v(x) 0 (x), get the calculated data u cal (t,x r ; x s ); Step 4, obtain the envelope e of the observed data obs (t,x r ; x s ) and the envelope e of the calculated data cal (t,x r ; x s ); Step 5, obtain phase and instantaneous frequency of observation data and calculated data; Step 6, obtain observation data u obs (t,x r ; x s ) with polarized envelope and calculated data u cal (t,x r ; x s ) with a polar envelope given the objective function J e (v(x)); Step 7, through direct envelope inversion and iterative optimization algorithm for the objective function J e (v(x)) is optimized to obtain the long wavelength component v of the velocity model l (x); step 8, given a new objective function J(v(x)) to be optimized in the next stage; step 9, by optimizing the objective function J(v(x)), obtain a fine velocity structure v f (x). This method can obtain more accurate polarized envelopes and be used for the inversion of strong scattering velocity models.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a polarized direct envelope inversion method based on seismic trace attribute analysis. Background technique [0002] Oil and natural gas are important strategic resources related to national economic development and national security. With the development of the petroleum industry and the deepening of exploration and development, the exploration difficulty gradually increases from the stage of structural exploration to the stage of lithology exploration. In order to meet this requirement, full waveform inversion has developed rapidly and has become a research hotspot in the field of geophysics today. Full waveform inversion is an effective method to estimate formation parameters. It can not only provide high-resolution and high-precision velocity models for seismic imaging, but also has the ability to invert various parameters simultaneously. [0003...

AI Technical Summary

Problems solved by technology

However, the direct envelope inversion only depends on the instantaneous amplitude information of the seismic signal and lacks the polarity information of the signal. In order to further improve the inversion effect, it is necessary to use the direct envelope inversion method with polarity, and the accurate polarity information Acquisition is the key to the correct implementation of inversion

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