System and method to estimate compressional to shear velocity (vp/vs) ratio in a region remote from a borehole

A technology of compressional-to-short-wave velocity ratio and borehole, applied in seismology, seismology, instruments, etc. for logging records
CN102395903AInactive Publication Date: 2012-03-28CHEVROU USA INC +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHEVROU USA INC
Publication Date
2012-03-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region (130) remote from a borehole using a conveyed logging tool (140) is disclosed. In some aspects, the method includes arranging a first source (105) in the borehole (110) and generating a steered beam of elastic energy at a first frequency; arranging a second source (115) in the borehole (110) and generating a steerable beam of elastic energy at a second frequency, such that the steerable beam at the first frequency and the steerable beam at the second frequency intercept at a location (130) away from the borehole (110); receiving at the borehole (110) by a sensor (135) a third elastic wave, created by a three wave mixing process, with a frequency equal to a difference between the first and second frequencies and a direction of propagation towards the borehole (110).
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Description

[0001] Cross references to related applications

[0002] This application claims the benefit of U.S. Patent Application Serial No. 12 / 463,796 filed on May 11, 2010. This U.S. patent application claims priority for U.S. Provisional Patent Application No. 61 / 170,070 filed on April 16, 2009. The entire content is hereby quoted as a reference, according to 35U.SC§119(e).

[0003] Government rights

[0004] The present invention was carried out under the support of the government under the cooperative research and development agreement (CRADA) contract number DE-AC52-06NA25396 signed by the US Department of Energy. The government may have certain rights in this invention. Technical field

[0005] Generally speaking, the present invention relates to seismic exploration of rock formations. More specifically, it relates to the use of a combination of seismic sources in a borehole configured to provide elastic energy to generate a three-dimensional image of the non-linear nature and the P / P w...

Claims

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