The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1988
Filed:
Sep. 30, 1986
Carl H Sondergeld, Broken Arrow, OK (US);
Martin L Smith, Broken Arrow, OK (US);
Amoco Corporation, Chicago, IL (US);
Abstract
A borehole logging method and system are provided for obtaining a measure of formation anisotropy in formations adjacent the borehole. The system comprises an elongated housing for suspension within the borehole. First and second asymmetric pressure wave sources for generating shear waves directly within formations adjacent the borehole are mounted with the housing. Additionally, first and second sets of receivers are mounted with the housing for recording first and second signals representative of the earth's response to the first and second shear waves propagating in the formations adjacent the borehole, respectively. The first set of receivers have an orientation matching the first source, and the second set of receivers have an orientation matching the second source. The system further includes a processor for determining a measure of formation anisotropy from the first and second recorded signals. With a first set of source/receiver pairs having matched polarizations and azimuthal orientations, first signals, representative of the imparted acoustic shear wave energy after propagation through a portion of the formations adjacent the borehole, are recorded. With a second set of source/receiver pairs having matched polarizations and azimuthal orientations different from the first set of source/receiver pairs, second signals, representative of the imparted acoustic shear wave energy after propagation through a portion of the formations adjacent the borehole, are recorded. The first and second recorded signals can be processed for events representative of first and second shear wavefront arrivals of the imparted acoustic shear wave energy. Formation anisotropy can be characterized with measures of the events representative of the first and second shear wave arrivals in the first and second recorded signals.