Method of analyzing a subterranean formation and method of producing a mineral hydrocarbon fluid from the formation

a technology of subterranean formations and mineral hydrocarbon fluids, which is applied in the direction of fluid removal, survey, borehole/well accessories, etc., can solve the problems of difficult analysis of thinly laminated sand/shale sequences, and more complicated analysis

Inactive Publication Date: 2007-11-08
SHELL OIL CO
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Benefits of technology

[0013]The electromagnetic properties of a formation layer comprising a number of thin layers may be approximated by one formation layer comprising an electromagnetic anisotropy. It is thereby avoided to have to take into account each thin layer individually when inverting the response...

Problems solved by technology

However, the larger the number of layers, and particularly when the layers are thin, the more complicated the analysis is.
For in...

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  • Method of analyzing a subterranean formation and method of producing a mineral hydrocarbon fluid from the formation
  • Method of analyzing a subterranean formation and method of producing a mineral hydrocarbon fluid from the formation
  • Method of analyzing a subterranean formation and method of producing a mineral hydrocarbon fluid from the formation

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Embodiment Construction

[0085]The present invention will now be described in relation to particular embodiments, which are intended in all respects to be illustrative rather than restrictive. Alternative embodiments will become apparent to those skilled in the art to which the present invention pertains without departing from its scope.

[0086]It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and sub-combinations specifically set forth. This is contemplated and within the scope of the claims.

[0087]Embodiments of the invention relate to analysis of electromagnetic (EM) induction signals and to a system and method for determining distance and / or direction to an anomaly in a formation from a location within a wellbore. The analysis is sensitive to electromagnetic anomalies, in particular electromagnetic induction anomalies.

[0088]Both frequency domain excitation and time domain excitation have been used to excite electromagneti...

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Abstract

Method of analyzing a subterranean formation traversed by a wellbore. The method uses a tool comprising a transmitter antenna and a receiver antenna, the subterranean formation comprising one or more formation layers. The tool is suspended inside the wellbore, and one or more electromagnetic fields are induced in the formation. One or more time-dependent transient response signals are detected and analyzed. Electromagnetic anisotropy of at least one of the formation layers is detectable. Geosteering cues may be derived from the time-dependent transient response signals, for continued drilling of the well bore until a hydrocarbon reservoir is reached. The hydrocarbon may then be produced.

Description

CROSS REFERENCE TO EARLIER APPLICATION[0001]The present application claims benefit under 35 USC § 119(e) of U.S. Provisional application No. 60 / 797,556 filed 4 May 2006.FIELD OF THE INVENTION[0002]In one aspect, the present invention relates to a method of analyzing a subterranean formation traversed by a wellbore. In another aspect the invention relates to a method of producing a mineral hydrocarbon fluid from an earth formation. In still another aspect, the invention relates to a computer readable medium storing computer readable instructions that analyze one or more electromagnetic response signals.BACKGROUND OF THE INVENTION[0003]In logging while drilling (LWD) geo-steering applications, it is advantageous to detect the presence of a formation anomaly ahead of or around a bit or bottom hole assembly. There are many instances where “Look-Ahead” capability is desired in LWD logging environments. Look-ahead logging comprises detecting an anomaly at a distance ahead of a drill bit. ...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
CPCG01V3/28
Inventor HAGIWARA, TERUHIKOBANNING-GEERTSMA, ERIK JANOSTERMEIER, RICHARD MARTIN
Owner SHELL OIL CO
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