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Method for attenuation of multiple reflections in seismic data

A technology of multiple reflections and seismic signals, which is applied in the field of seismic exploration and can solve problems such as difficulty in inferring underground structure and composition

Inactive Publication Date: 2010-01-06
PGS GEOPHYSICAL AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This reverberation can be of considerable magnitude throughout the detected acoustic energy, masking acoustic energy reflected from subsurface formation boundaries and thus making it more difficult to use seismic data to infer subsurface structure and composition

Method used

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  • Method for attenuation of multiple reflections in seismic data
  • Method for attenuation of multiple reflections in seismic data
  • Method for attenuation of multiple reflections in seismic data

Examples

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Embodiment Construction

[0018] figure 1 An example of marine seismic data acquisition useful with the present invention is shown schematically. The seismic survey vessel 10 moves along a surface 18A of a body of water 18, such as a lake or ocean. The survey vessel 10 includes equipment shown at 12 and collectively referred to as a "recording system" which includes means (not shown separately) for activating a source of seismic energy 14 at selected times for determining the vessel 10, source 14 and the geodetic position of each of the plurality of seismic sensors 16, and for recording the signals generated by the seismic sensors 16. The various devices that recording system 12 may include are well known in the art and need not be described in detail.

[0019] Seismic sensors 16 are typically hydrophones or other pressure or pressure gradient responsive detectors. In other examples other types of seismic sensors may be used, such as particle motion response detectors. Seismic sensors 16 are arrang...

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Abstract

A method for attenuating multiple reflections in seismic signals includes coherency filtering the seismic signals. The seismic signals are low pass filtered and high pass filtered seismic signals at a frequency selected such that substantially only multiple reflections exist in the seismic signals above the frequency. A mask is generated having unity value where the high pass filtered signal amplitude exceeds a selected threshold. The mask has unity zero value for all other filtered signals. The mask value is multiplied by the low pass filtered signals. The multiplied signals are added to the high pass filtered signals and a coherency filter is applied to remove remaining primary energy to generate a model of the multiple reflections. The multiple reflection model is subtracted from the coherency filtered seismic signals.

Description

technical field [0001] The present invention relates generally to the field of seismic exploration. More specifically, the present invention relates to methods for processing seismic data to attenuate the effects of multiple reflections. Background technique [0002] In seismic exploration, seismic data is obtained by injecting acoustic energy near the Earth's surface and detecting the acoustic energy reflected from the boundaries between different layers of the subsurface stratigraphic structure. Acoustic energy is reflected when the acoustic impedance to the boundary between adjacent layers is different. Signals representing the detected acoustic energy are interpreted to infer the structure and composition of subsurface Earth structures. [0003] In marine seismic surveys, acoustic energy is typically injected into the earth using a seismic energy source such as an air gun or an array of air guns. The air gun or array is typically activated at a selected depth in the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/364G01V1/3808G01V2210/21G01V2210/56
Inventor E·J·费里斯
Owner PGS GEOPHYSICAL AS
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