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Acoustic wave equation reverse time migration imaging method based on pseudospectral time-domain algorithm

A technology of reverse time migration imaging and acoustic wave equation, which is applied in the field of geophysical exploration to achieve the effect of reducing storage space, ensuring accuracy and saving storage space

Inactive Publication Date: 2017-07-07
XIAMEN UNIV
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Problems solved by technology

Traditional reverse time migration imaging needs to save snapshots of one of the wave fields at all times to the disk, and then read them out during the imaging process, which largely becomes the bottleneck of the entire imaging process

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Embodiment Construction

[0031] The technical solution, imaging effect and efficiency of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] 1) According to the specific situation of the initial model and the existing computing resources, reasonably divide the shot aperture and shot spacing. It is necessary to consider the full use of computing resources, but also consider the computing time and accuracy. Therefore, the gun spacing cannot be too large, and the necessary multiple coverage can be satisfied. For the sake of simplicity, we set the spacing of each shot to be the same, the shot hole diameter to be the same, and the source position and depth to be the same.

[0033] 2) Perform the following processing steps for each shot:

[0034] (1) Obtain geophone data in field experiments or use real model simulation to generate geophone data. For the first-order acoustic wave equation, it is necessary to obtain the acoustic pressure signal.

...

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Abstract

The invention provides an acoustic wave equation reverse time migration imaging method based on a pseudospectral time-domain algorithm and relates to geophysical exploration. The method is characterized by, according to specific situations of an initial model and with existing computing resource states being combined, reasonably dividing shot aperture and shot interval, and by utilizing calculation resources, calculation time and precision, setting each shot interval, shot aperture, source position and depth of each shot to be same; carrying out processing on each shot; after all shots are processed independently, superposing imaging results of all shots in sequence according to specific division situations to form an overall imaging result; and for the imaging result, carrying out filtering on low-frequency noise through a high-pass filter, thereby improving imaging resolution. Numerical simulation is the most important component of reverse time migration imaging; in the reverse time migration imaging, a two-way wave equation needs to be subjected to wavefield continuation; and in the solving process, numerical iteration and cross correlation of a source wavefield and a detector wavefield need to be realized simultaneously, which need to be realized concretely through a certain numerical method.

Description

technical field [0001] The invention relates to geophysical exploration, in particular to an acoustic wave equation reverse time migration imaging method based on a time-domain pseudo-spectrum method. Background technique [0002] Reverse time migration (RTM) method is one of the research hotspots in the field of oil and gas exploration in recent years, and it is also one of the seismic prestack depth migration methods with the highest imaging accuracy. The basic idea of ​​reverse time migration was first proposed by Hemon in 1978 [1]. Subsequently, Baysal[2], Whitmore[3] and McMECHAN[4] proposed the specific application of the idea of ​​reverse time migration respectively. Compared with other imaging methods, the reverse time migration imaging method has the characteristics of high imaging accuracy and wide adaptability, especially in the imaging of complex geological structures with high dip angles and large horizontal velocity changes, and can be used for conventional se...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28G01V2210/512
Inventor 柳清伙谢剑刚庄明伟刘海郭子超梁冰洋
Owner XIAMEN UNIV
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