Elastic medium wave equation return wave travel time retrieval method

A technology of elastic media and wave equations, applied in seismic signal processing and other fields

Active Publication Date: 2018-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] Most of the existing reflected wave waveform inversion methods are designed based on the acoustic wave equation, and can only obtain the low-frequency model of the longitudinal wave velocity

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  • Elastic medium wave equation return wave travel time retrieval method
  • Elastic medium wave equation return wave travel time retrieval method
  • Elastic medium wave equation return wave travel time retrieval method

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Embodiment Construction

[0115] The present invention will be described in detail below in combination with specific embodiments.

[0116] Such as figure 1 As shown, it is a flow chart of the present invention to implement elastic medium wave equation reflection wave traveltime inversion, specifically including:

[0117] (1) Design a new travel time residual objective function;

[0118] The objective function is constructed by using the PP reflected wave travel time residual;

[0119] (2) Deduce the adjoint equation and background parameter gradient formula under the new objective function;

[0120] Based on the adjoint method (Adjoint method), the adjoint equation and the gradient formula of the objective function to the background parameter are derived;

[0121] (3) Calculate the gradient of the background parameter;

[0122] Specifically include: forward propagation of the background wave field; forward propagation of the disturbed wave field; reverse propagation of the reflected wave travel ti...

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Abstract

The invention provides an elastic medium wave equation return wave travel time retrieval method. The method comprises the steps of designing a new travel time residual target function; deducing an adjoint equation and a background parameter gradient formula under the new target function; calculating the gradient of background parameters; processing the gradient by using the quasi-Newton method retrieval algorithm; calculating the iteration step size by using the parabola fitting method; updating a background parameter model until the convergence condition is met. The method has the advantage that the precision of elastic medium return waveform retrieval is improved by using the new travel-time target function, so that reliable longitudinal wave velocity and transverse wave velocity initialmodels can be obtained.

Description

technical field [0001] The invention belongs to the technical field of seismic wave inversion, and relates to establishment of an initial model of elastic parameters (longitudinal and shear wave velocities and densities) in exploration earthquakes and natural earthquakes to improve the accuracy of multi-component elastic seismic data inversion and imaging. Background technique [0002] The basic problem of geophysics is to obtain the structure and structure information of the earth's interior by studying the characteristics of various geophysical fields. Seismic inversion estimates the corresponding geophysical parameters through the seismic data observed on the surface or in the well, and then reverses the structure and material composition of the underground, which can effectively identify geological structures, predict natural disasters, and explore oil and gas reservoirs. With the deepening of exploration, the target of oil and gas exploration has changed from large-scal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 任志明李振春黄少华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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