Staggered mesh forward modeling method based on time-space domain optimization

A technique of staggered grid and forward modeling, applied in seismic signal processing, etc., can solve the problems of less research on the first-order variable density acoustic wave equation, achieve the effect of suppressing numerical dispersion and improving calculation accuracy

Inactive Publication Date: 2017-06-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] In addition, most of the current research on finite difference forward optimization is based on the second-order acoustic wave equation, and there are few studies on the first-order variable density acoustic wave equation.

Method used

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  • Staggered mesh forward modeling method based on time-space domain optimization
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  • Staggered mesh forward modeling method based on time-space domain optimization

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Embodiment 1

[0033] For numerical frequencies, we can start with optimizing the differential coefficients, and we can make improvements in the following three aspects: (1) Based on the principle of plane waves, deduce the differential operator and the filter response of the differential operator in the wavenumber domain; and use the function fitting algorithm to make The difference operator is close to the differential operator; (2) The space difference and spectral decomposition are combined in the wavenumber domain, and the difference operator is improved to reduce the calculation error. (3) Improve the calculation accuracy of finite difference from the aspect of grid nodes.

[0034] The staggered grid forward modeling method based on time-space domain optimization can be realized through the following technical measures: Step 1, the plane wave solution of the velocity-pressure equation set, the result will be used to obtain the precise staggered time recursive format coefficients; 2. Th...

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Abstract

The invention discloses a staggered mesh forward modeling method based on time-space domain optimization. According to the method, a plane wave general solution of a first order pressure intensity-speed partial differential equation set is solved, a pressure intensity field and polarization speed field analysis expression of a first order sound wave equation is acquired, a traditional space staggering grid difference format is combined with a precise time recursion format to acquire a precise staggering time recursion format, and least square iteration solution is lastly employed to acquire a high precision staggering grid difference operator for forward modeling. The method is advantaged in that value frequency dispersion is improved to a certain degree, phase velocity precision is improved, and the substantial effect can be realized under high-order conditions.

Description

technical field [0001] The invention belongs to geophysics processing technology, and is an interlaced grid forward simulation method based on time-space domain optimization. Background technique [0002] With the deepening of seismic exploration and development, the requirements for the accuracy of seismic wavefield forward modeling and the resolution of underground imaging results are getting higher and higher. Reverse time migration imaging, least squares reverse time migration and full waveform Inversion imaging has become a research hotspot, and the efficiency and accuracy of wavefield continuation directly affect the efficiency and accuracy of subsequent imaging and inversion. The finite difference method takes into account both computational efficiency and simulation accuracy, and has been widely used in the wavefield continuation of seismic exploration. The finite difference method uses a discrete difference operator to approximate a continuous partial derivative op...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 赵胜天李继光冷天柳光华滕厚华陈新荣黄建平李晓峰刘培君
Owner CHINA PETROLEUM & CHEM CORP
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