Methods for determining formation and borehole parameters using fresnel volume tomography

Patent 7027927 Issued on April 11, 2006. Estimated Expiration Date:

December 23, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Calculation of raypaths and wavepaths from traveltime tables for the tomographic estimation of transmission velocities
Patent #: 5062086
Issued on: 10/29/1991
Inventor: Harlan, et al.

Methods for determining formation and borehole parameters via two-dimensional tomographic reconstruction of formation slowness Patent #: 5081611
Issued on: 01/14/1992
Inventor: Hornby

Inventors

Application

No. 10328309 filed on 12/23/2002

US Classes:

702/11Formation characteristic

Examiners

Primary: McElheny, Donald Jr.

Attorney, Agent or Firm

International Class

G01V 1/48

Abstract

A method and apparatus for determining formation slowness around a borehole are provided. The Fresnel volume concept is applied for traveltime tomography. The Fresnel volume represents a sonic wave propagation path about the borehole. The application of Fresnel volume to sonic data provides for a stable inversion and makes practical 3-D tomography. Inversion is accomplished by an iterative back-projection method.

Other References

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