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Preserved-amplitude reverse-time migration low frequency noises suppression method and system

A technology of low-frequency noise and reverse time migration, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of insufficient amplitude preservation, achieve the effects of no residual artifacts, accurate calculation results, and guaranteed reliability

Active Publication Date: 2019-01-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0011] The present invention is aimed at the problem of insufficient amplitude preservation after imaging in the conventional RTM low-frequency noise suppression method. Using the amplitude-preserving low-frequency filtering technology, first estimate the low-frequency noise, and then subtract the low-frequency noise from the original signal to obtain the filtering result to achieve amplitude preservation. The purpose of suppressing low frequency noise

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  • Preserved-amplitude reverse-time migration low frequency noises suppression method and system

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[0056] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure 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 disclosure to those skilled in the art.

[0057] The reverse time migration (RTM) algorithm is the most accurate reflection wave imaging algorithm, which can be applied to resource fields such as oil exploration, gas field development, and mineral resource detection. The RTM algorithm inevitably produces low-frequency noise. Conventional noise suppression methods cannot meet the requirements of amplitude preservation, and there may be problems with low-frequency noise suppression, whi...

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Abstract

The present invention discloses an preserved-amplitude reverse-time migration low frequency noises suppression method and system, the method comprises: inputting seismic data; performing conventionalreverse-time migration; using a preserved-amplitude low-frequency filtering algorithm to perform low-frequency noises suppression; and obtaining a filtering result. The preserved-amplitude low-frequency filtering algorithm firstly performs slide fitting on noises to estimate the low-frequency noises from a seismic signal, and then subtracts the low-frequency noises from an original signal to obtain the filtering result. The method can realise preserved-amplitude suppression of the low-frequency noises generated by the reverse-time migration RTM. The method is more accurate in comparison with conventional methods, and has no residual artifact, and obtains suppressed noises through subtracting data before and after the suppression, indicating that the method achieves effective suppression ofthe low frequency noises without losing the amplitude characteristic of an effective signal.

Description

technical field [0001] The invention is a new technology for suppressing reverse-time migration noise by artificial seismic waves, which can be applied to geological survey fields such as petroleum exploration and mineral exploration, and specifically relates to a method and system for suppressing amplitude-preserving reverse-time migration low-frequency noise. Background technique [0002] my country's oil exploration is faced with many problems such as complex surface, complex structure, and complex genesis. Among them, reverse time migration imaging (RTM) is an effective method to solve these problems. This method directly solves the wave equation, has no propagation angle limitation, and can image folded waves and multiple waves. This method can still image accurately when the speed changes drastically, but there are inevitably artifacts in various types of wave field imaging. Especially in the position where the reflective interface exists, it is easy to generate stron...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00
CPCG01V1/005G01V1/01
Inventor 李博许璐
Owner CHINA PETROLEUM & CHEM CORP
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