Pre-stack time migration method based on split-step Fourier algorithm

A pre-stack time migration and fractional-step Fourier technology, applied in the field of migration imaging, can solve the problems of high imaging angle, poor adaptability to lateral changes in velocity, and inability to adapt to large changes in lateral velocity.

Active Publication Date: 2017-01-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This method has a high imaging angle, but the amount of calculation is large. The wave field is calculated by linear interpolation, which cannot adapt to large changes in lateral velocity.
[0008] Sergey fomel (2013) proposed a method to solve the wave equation from the Cartesian coordinate system to the imaging ray coordinate system. This method avoids the approximate solution of the Green's function calculation in the conventional time migration and improves the time migration. Calcul

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  • Pre-stack time migration method based on split-step Fourier algorithm
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  • Pre-stack time migration method based on split-step Fourier algorithm

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[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0036] Such as figure 1 as shown, figure 1 It is a flow chart of the pre-stack time migration method based on the split-step Fourier algorithm of the present invention.

[0037] In step 101, seismic data is input, and the seismic data is a common shot point gather that has undergone preprocessing such as conventional denoising and static correction. In one embodiment, for figure 2 The common shot set p obtained by the forward modeling of the marmousi depth domain layer velocity model u (t, x, y) for routine preprocessing such as denoising and static correction. The process goes to step 102.

[0038] In step 102, pick the root mean sq...

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Abstract

The invention provides a Pre-stack time migration method based on a split-step Fourier algorithm. The method comprises the steps of inputting pre-processed seismic data; picking up the root mean square speed in an interactive mode; calculating the ray propagation time from an imaging point to a focus point; converting seismic data of a time-space domain into frequency-wave number; acquiring a continuation value of a background wave field; transforming the continued wave field into the frequency-space domain through Fourier transform, and performing a time shift operation through a split-step Fourier time shift operator of the time domain so as to realize continuation for a disturbance wave field; and performing phase shift on a frequency-space domain seismic wave field and carrying out integration on the effective frequency band by using a excitation time imaging condition so as to acquire a seismic imaging result of a shot record. The pre-stack time migration method based on the split-step Fourier algorithm can carry out migration by applying the root mean square speed, and improves the adaptive capacity for speed vertical and longitudinal variations and the amplitude preserving capacity for migration imaging of pre-stack time migration under the condition of not increasing the speed modeling difficulty.

Description

technical field [0001] The invention relates to the field of migration imaging in seismic data processing, in particular to a pre-stack time migration method based on a sub-step Fourier algorithm. Background technique [0002] Seismic migration is an inversion operation that rearranges seismic information in order to return the energy of seismic waves to its real position in space and obtain the real structure of the underground. Wave equation prestack migration imaging is mainly divided into two types: prestack time migration imaging and prestack depth migration imaging. Prestack depth migration is highly adaptable to lateral changes in subsurface velocity and can provide high-quality imaging results in the depth domain. However, it requires high accuracy of the velocity model and requires a large amount of calculation. Therefore, it is a high-input and high-return solution. Pre-stack time migration imaging has high computational efficiency, and at the same time, it has lo...

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Application Information

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IPC IPC(8): G01V1/30G01V1/34
Inventor 王有新葛大明王常波孙朋朋张达孙瑞艳王磊汪浩
Owner CHINA PETROLEUM & CHEM CORP
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