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Title: System and method for investigating sub-surface features of a rock formation using compressional acoustic sources

Abstract

A system and method for investigating rock formations outside a borehole are provided. The method includes generating a first compressional acoustic wave at a first frequency by a first acoustic source; and generating a second compressional acoustic wave at a second frequency by a second acoustic source. The first and the second acoustic sources are arranged within a localized area of the borehole. The first and the second acoustic waves intersect in an intersection volume outside the borehole. The method further includes receiving a third shear acoustic wave at a third frequency, the third shear acoustic wave returning to the borehole due to a non-linear mixing process in a non-linear mixing zone within the intersection volume at a receiver arranged in the borehole. The third frequency is equal to a difference between the first frequency and the second frequency.

Inventors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1326806
Patent Number(s):
9,453,926
Application Number:
13/292,908
Assignee:
Los Alamos National Security LLC (Los Alamos, NM) LANL
DOE Contract Number:
AC52-06NA25396
Resource Type:
Patent
Resource Relation:
Patent File Date: 2011 Nov 09
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Vu, Cung Khac, Skelt, Christopher, Nihei, Kurt, Johnson, Paul A., Guyer, Robert, Ten Cate, James A., Le Bas, Pierre-Yves, and Larmat, Carene S. System and method for investigating sub-surface features of a rock formation using compressional acoustic sources. United States: N. p., 2016. Web.
Vu, Cung Khac, Skelt, Christopher, Nihei, Kurt, Johnson, Paul A., Guyer, Robert, Ten Cate, James A., Le Bas, Pierre-Yves, & Larmat, Carene S. System and method for investigating sub-surface features of a rock formation using compressional acoustic sources. United States.
Vu, Cung Khac, Skelt, Christopher, Nihei, Kurt, Johnson, Paul A., Guyer, Robert, Ten Cate, James A., Le Bas, Pierre-Yves, and Larmat, Carene S. Tue . "System and method for investigating sub-surface features of a rock formation using compressional acoustic sources". United States. doi:. https://www.osti.gov/servlets/purl/1326806.
@article{osti_1326806,
title = {System and method for investigating sub-surface features of a rock formation using compressional acoustic sources},
author = {Vu, Cung Khac and Skelt, Christopher and Nihei, Kurt and Johnson, Paul A. and Guyer, Robert and Ten Cate, James A. and Le Bas, Pierre-Yves and Larmat, Carene S.},
abstractNote = {A system and method for investigating rock formations outside a borehole are provided. The method includes generating a first compressional acoustic wave at a first frequency by a first acoustic source; and generating a second compressional acoustic wave at a second frequency by a second acoustic source. The first and the second acoustic sources are arranged within a localized area of the borehole. The first and the second acoustic waves intersect in an intersection volume outside the borehole. The method further includes receiving a third shear acoustic wave at a third frequency, the third shear acoustic wave returning to the borehole due to a non-linear mixing process in a non-linear mixing zone within the intersection volume at a receiver arranged in the borehole. The third frequency is equal to a difference between the first frequency and the second frequency.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 27 00:00:00 EDT 2016},
month = {Tue Sep 27 00:00:00 EDT 2016}
}

Patent:

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  • A system and a method for investigating rock formations includes generating, by a first acoustic source, a first acoustic signal comprising a first plurality of pulses, each pulse including a first modulated signal at a central frequency; and generating, by a second acoustic source, a second acoustic signal comprising a second plurality of pulses. A receiver arranged within the borehole receives a detected signal including a signal being generated by a non-linear mixing process from the first-and-second acoustic signal in a non-linear mixing zone within the intersection volume. The method also includes-processing the received signal to extract the signal generatedmore » by the non-linear mixing process over noise or over signals generated by a linear interaction process, or both.« less
  • A method of interrogating a formation includes generating a conical acoustic signal, at a first frequency--a second conical acoustic signal at a second frequency each in the between approximately 500 Hz and 500 kHz such that the signals intersect in a desired intersection volume outside the borehole. The method further includes receiving, a difference signal returning to the borehole resulting from a non-linear mixing of the signals in a mixing zone within the intersection volume.
  • A system and a method for generating a three-dimensional image of a rock formation, compressional velocity VP, shear velocity VS and velocity ratio VP/VS of a rock formation are provided. A first acoustic signal includes a first plurality of pulses. A second acoustic signal from a second source includes a second plurality of pulses. A detected signal returning to the borehole includes a signal generated by a non-linear mixing process from the first and second acoustic signals in a non-linear mixing zone within an intersection volume. The received signal is processed to extract the signal over noise and/or signals resultingmore » from linear interaction and the three dimensional image of is generated.« less
  • A system and a method includes generating a first signal at a first frequency; and a second signal at a second frequency. Respective sources are positioned within the borehole and controllable such that the signals intersect in an intersection volume outside the borehole. A receiver detects a difference signal returning to the borehole generated by a non-linear mixing process within the intersection volume, and records the detected signal and stores the detected signal in a storage device and records measurement parameters including a position of the first acoustic source, a position of the second acoustic source, a position of themore » receiver, elevation angle and azimuth angle of the first acoustic signal and elevation angle and azimuth angle of the second acoustic signal.« less
  • A system for investigating non-linear properties of a rock formation around a borehole is provided. The system includes a first sub-system configured to perform data acquisition, control and recording of data; a second subsystem in communication with the first sub-system and configured to perform non-linearity and velocity preliminary imaging; a third subsystem in communication with the first subsystem and configured to emit controlled acoustic broadcasts and receive acoustic energy; a fourth subsystem in communication with the first subsystem and the third subsystem and configured to generate a source signal directed towards the rock formation; and a fifth subsystem in communicationmore » with the third subsystem and the fourth subsystem and configured to perform detection of signals representative of the non-linear properties of the rock formation.« less