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Marine streamer dual-sensor acquisition deghosting method and system

A streamer and marine technology, applied in the field of ghost wave suppression based on the least squares algorithm for dual detection and acquisition of marine streamers, it can solve the problems of ghost wave influence, low frequency loss, notch wave, etc., and achieve good stability.

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The present invention is aimed at the original data collected by dual-detection of marine streamers, and based on the least square algorithm, combined processing of land and water and detection signals, and suppression of ghost waves, so as to obtain raw data of marine broadband seismic, which is used to solve the serious influence of ghost waves and low-frequency missing in marine seismic acquisition , notch phenomenon and other issues

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  • Marine streamer dual-sensor acquisition deghosting method and system
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  • Marine streamer dual-sensor acquisition deghosting method and system

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[0047] 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.

[0048] In the dual-detection acquisition of marine streamers, ghost waves have a great impact on the waveform and frequency bandwidth of the primary wave. Ghost wave suppression is an important factor to improve the resolution, fidelity and broadband acquisition effect of marine seismic data.

[0049] The core part of the ocean streamer dual-detection acquisition technology is the acquisition of broadband raw data and the combined processing...

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Abstract

The invention provides a marine streamer dual-sensor acquisition deghosting method and system. The method includes the following steps that: pressure wave field signals and vertical velocity wave field signals are acquired; a relationship between ghost-free up-going wave field signals and the pressure wave field signals is built; a relationship between the pressure wave field signals and the vertical velocity wave field signals is established according to Newton's second law; and a pressure wave field and a vertical velocity wave field are combined based on the least squares algorithm, so thatghost wave signals are eliminated. According to the marine streamer dual-sensor acquisition deghosting method and system of the invention, water detection data and land detection data combination canbe realized with a least squares-based dual-sensor data combination method; the method does not rely underground hypothesis information, and therefore, the method has good stability, is less restricted by acquisition environments, and can adapt to complex marine terrain and geological conditions.

Description

technical field [0001] The invention belongs to the field of marine seismic broadband acquisition, and in particular relates to a method for suppressing ghost waves in double-detection acquisition of ocean streamers based on the least square algorithm. Background technique [0002] Different from the conventional marine acquisition, the towline dual-detection acquisition technology is at the same position of the cable, and simultaneously tows two sets of geophones, the water detector and the land detector, which are used to receive the pressure field and vertical velocity field signals respectively. The dual-detection acquisition is the only one The acquisition method of receiving pressure wave field and vertical velocity wave field at the same time, the data is very convincing. [0003] Due to the different filtering of seismic signals by water and land geophones, the signals are different in amplitude, phase, and frequency. The main part of the data merging algorithm is am...

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Application Information

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IPC IPC(8): G01V1/36G01V1/38
CPCG01V1/36G01V1/38G01V2210/32
Inventor 李洪建刘定进杨金龙
Owner CHINA PETROLEUM & CHEM CORP
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