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Elastic reverse time migration method and system based on lowrank finite difference

A finite-difference and reverse-time migration technology, applied to measuring devices, instruments, scientific instruments, etc., can solve problems such as difficult to meet high-precision elastic reverse-time migration

Active Publication Date: 2020-03-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Conventional finite-difference methods are difficult to meet the requirements of high-precision elastic reverse-time migration. Therefore, it is necessary to develop a low-rank finite-difference-based elastic reverse-time migration method and system

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  • Elastic reverse time migration method and system based on lowrank finite difference
  • Elastic reverse time migration method and system based on lowrank finite difference
  • Elastic reverse time migration method and system based on lowrank finite difference

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Embodiment Construction

[0086] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0087] figure 1 A flow chart showing the steps of a lowrank finite difference based elastic reverse time migration method according to the present invention.

[0088] In this embodiment, an elastic reverse time migration method based on lowrank finite difference according to the present invention may include:

[0089] Step 101, construct lowrank finite difference coefficients

[0090] Among them, i=1,3, j=1,3, p, s represents P wave, S wave, x=(x,z) represents space coordinate vec...

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Abstract

The invention discloses an elastic reverse time migration method and system based on lowrank finite difference. The method comprises the following steps that: a lowrank finite difference coefficient is constructed; forward and reverse elastic wave field continuation is achieved on the basis of the discretization wave equation of the constructed lowrank finite difference coefficient; and PP and PSimaging profiles are obtained through the obtained forward and reverse elastic wave fields and scalar product imaging conditions. According to the method and system of the invention, the finite difference operator considering time and space is constructed by using a plane wave theory and a lowrank decomposition method and can meet the requirements of high-precision elastic wave field continuationin time and space directions; multi-component seismic data are fully utilized, longitudinal waves and transverse waves of vectors can be obtained in a continuation process, and therefore, the vector characteristics of an underground wave field are kept; the problems of the crosstalk of different wave modes and the polarity correction of converted waves in conventional elastic reverse time migration are avoided in an imaging process; and the imaging precision of elastic reverse time migration is improved.

Description

technical field [0001] The present invention relates to the technical field of seismic data pre-stack depth migration imaging, and more specifically, relates to an elastic reverse time migration method and system based on lowrank finite difference. Background technique [0002] Elastic reverse time migration is a migration imaging technology developed for multi-component seismic data. It makes full use of the vector characteristics of the elastic wave field and can provide imaging results of longitudinal waves (P waves) and converted shear waves (S waves). In the process of elastic reverse time migration, elastic wave field continuation is one of the key technologies, and its accuracy is directly related to the imaging quality. The conventional finite difference method is a commonly used wavefield continuation method. In order to meet the high-precision wavefield continuation, when the finite difference method discretizes the grid space, the sampling interval selected is us...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/28G01V1/362G01V2210/512G01V2210/74
Inventor 韩冬李博许璐
Owner CHINA PETROLEUM & CHEM CORP
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