Earthquake post-stack forward method of undulating surface

Abstract

The invention discloses a post-stack forward modeling method of fluctuating ground, which comprises the following steps: proceeding rectangular packing for geological mould of the fluctuating ground; filling the fluctuating ground at random speed value or density value; adopting Snail elementary to calculate the reflective factor model; eliminating the reflective influence of fluctuating ground to transform to frerquency area as original wave field; utilizing Fuliye limit differential continuation operator of single-pass fluctuating equation to continue the wave field along depth axle from upwards to downwards; keeping the wave field between input datum face (fluctuating ground) and output datum surface at zero; transforming the wave field of frequency area after continuing to the time domain to image; processing the imaging result into earthquake section image through normal display software; possessing good earthquake wave field analoging effect for geological model of the fluctuating ground.

Description

technical field [0001] The invention relates to the technical category of seismic post-stack forward modeling in the process of numerical simulation of reflected wave seismic wave fields, and is a post-stack forward modeling method for numerical simulation of seismic wave fields on undulating surfaces. Background technique [0002] The numerical simulation of seismic wave field is to simulate the propagation law of seismic waves in various underground media under the assumption that the structural model of the underground medium and the corresponding physical parameters are known, and calculate the values ​​that should be observed at each observation point on the ground or underground. A seismic simulation method for seismic records. On the one hand, it can provide a theoretical basis for seismic data acquisition, processing, and interpretation, and evaluate the scientificity, feasibility, and advancement of the method; on the other hand, it can be used to test the credibili...

AI Technical Summary

Problems solved by technology

The ray tracing method can flexibly deal with the undulating surface, but it is based on the kinematics of seismic waves, and simplifies the theory of seismic wave fluctuations into ray theory, mainly considering the kinematic characteristics of seismic wave propagation, lacking the dynamic information of seismic waves, and the calculation results are limited to a certain extent. The above is approximate, and the application has certain restrictions. The imaging accuracy of complex geological structures is low, and sometimes there will be blind spots.

The wave equation method solves the wave equation directly through numerical methods, which includes the dynamic characteristics of seismic wave propagation. The wave field information is rich and the simulation results are relatively accurate. horizontal interface

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