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System and method for investigating sub-surface features of a rock formation with acoustic sources generating coded signals

United States Patent

December 30, 2014
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
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 generated by the non-linear mixing process over noise or over signals generated by a linear interaction process, or both.
Vu; Cung Khac (Houston, TX), Nihei; Kurt (Oakland, CA), Johnson; Paul A. (Santa Fe, NM), Guyer; Robert (Reno, NV), Ten Cate; James A. (Los Alamos, NM), Le Bas; Pierre-Yves (Los Alamos, NM), Larmat; Carene S. (Los Alamos, NM)
Chevron U.S.A. Inc. (San Ramon, CA), Los Alamos National Security LLC (Los Alamos, NM)
13/ 292,915
November 9, 2011
GOVERNMENT RIGHTS This invention was made with Government support under Cooperative Research and Development Agreement (CRADA) Contract Number DE-AC52-06NA25396 awarded by the United States Department of Energy. The Government may have certain rights in this invention.