SYSTÈME ET PROCÉDÉ PERMETTANT DE PRODUIRE DES ÉVÉNEMENTS MICROSISMIQUES ET DE CARACTÉRISER LES PROPRIÉTÉS D'UN MILIEU AVEC DES INTERACTIONS ACOUSTIQUES NON LINÉAIRES
LARMAT, Carene S.;JOHNSON, Paul A.;GUYER, Robert A.;NIHEI, Kurt T.;CHEVRON U.S.A. INC.;TEN CATE, James A.;LE BAS, Pierre-Yves;LOS ALAMOS NATIONAL SECURITY LLC;VU, Cung Khac
发明人:
VU, Cung Khac,NIHEI, Kurt T.,JOHNSON, Paul A.,GUYER, Robert A.,TEN CATE, James A.,LE BAS, Pierre-Yves,LARMAT, Carene S.
申请号：
USUS2011/059973
公开号：
WO2012/064842A2
申请日:
2011.11.09
申请国别(地区):
US
年份:
2012
代理人:
摘要：
A method and system for generating a micro-seismic event in a medium from a non-linear interaction to characterize the medium is provided. The method includes generating, by a first acoustic source, a first coded acoustic signal comprising a first plurality of pulses arranged as a time sequence, each pulse comprising a modulated signal at a central frequency； and generating, by a second acoustic source, a second coded acoustic signal comprising a second plurality of pulses arranged as a time sequence, wherein each pulse comprises a modulated signal and a central frequency of the modulated signal within each pulse in the second plurality of pulses is a selected fraction d of the central frequency of the modulated signal for the corresponding pulse in the first plurality of pulses. The method further includes receiving, by a receiver, a detected signal including a third signal being generated by a non-linear mixing process from the first acoustic signal and the second acoustic signal in the mixing zone； performing, by a processor, data processing on the received signal, or correlating with a coded signal template, or both, to extract the third signal generated by the non-linear mixing process over noise or over signals generated by a linear interaction process, or both, to obtain an emulated micro-seismic event signal occurring at the mixing zone； and characterizing properties of the medium or creating a 3D image of the properties of the medium, or both, based on the emulated micro-seismic event signal.La présente invention concerne un procédé et un système permettant de produire un événement microsismique dans un milieu à partir d'une interaction non linéaire afin de caractériser le milieu. Le procédé consiste à produire, par une première source acoustique, un premier signal acoustique comprenant une première pluralité d'impulsions disposées en tant que séquence temporelle, chaque impulsion comprenant un signal modulé à une fréquence centrale ； et à produire, par une
