Waveform inversion in laplace-fourier domain
AssigneeShin's Geophysics
InventorChangsoo Shin
Life of this patent
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Abstract
Disclosed are an apparatus and method for visualizing subsurface velocity structure by processing signals through waveform inversion in the Laplace-Fourier domain, and a recording medium storing a program for implementing the method. A receiver receives a seismic signal from a target region, and a signal processor processes the seismic signal to generate image data for visualizing the subsurface structure of the target region. The signal processor performs the waveform inversion in the Laplace-Fourier domain, thereby obtaining a velocity model similar to an true structure of the target region.
Claims17
An apparatus for visualizing subsurface structure using waveform inversion in the Laplace-Fourier domain, the apparatus comprising a receiver receiving a seismic signal from a target region that is to be measured, and a signal processor processing the seismic signal to generate image data for visualizing the subsurface velocity structure of the target region, wherein
- the signal processor comprises:
- an input unit receiving time-domain measured data from the receiver;
- a transformer transforming the time-domain measured data into Laplace-Fourier-domain measured data using a complex damping constant;
- a modeled data generator setting up an equation including parameters representing physical characteristics and solving the equation in the Laplace-Fourier domain to obtain modeled data;
- and
- a parameter update unit updating the parameters by comparing the Laplace-Fourier-domain measured data with the modeled data.
A method for processing seismic data received from a target region to visualize subsurface velocity structure of the target region, the method comprising:
- receiving time-domain measured data from the target region;
- transforming the time-domain measured data into Laplace-Fourier-domain measured data using a complex damping constant;
- setting up an equation including parameters representing physical characteristics of the target region and solving the equation in the Laplace-Fourier domain to obtain modeled data;
- and
- updating the parameter by comparing the Laplace-Fourier domain measured data with the modeled data.
A non-transitory recording medium storing a program, the program comprising:
- receiving time-domain measured data;
- transforming the time-domain measured data into Laplace-Fourier-domain measured data using a complex damping constant;
- setting up an equation including an initial parameter and solving the equation in the Laplace-Fourier domain to obtain modeled data;
- and
- defining an objective function representing a difference between the measured data and the modeled data and updating the parameter to minimize the objective function.
Dependencies are inferred from the claim text.