US4939649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of correcting nonunimodality of dipmeter traces by uniquely transforming individual traces or intervals
Assignee: BP Corp North America Inc
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Filing: 1988-07-29
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Granted: 1990-07-03
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Expires: 2008-07-29
Abstract
Abstract A set of dipmeter data comprising monunimodal-symmetric datasets is processed prior to correlation and dip computation and display by transforming the nonunimodal-symmetric datasets into unimodal-symmetric datasets while maintaining the subsets which are already unimodal-symmetric.
Inventors
- 👤 John A. Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:18
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
A method for preprocessing dipmeter traces for subsequent correlation, dip computation, and display of dip angle and direction of structural features intersecting a borehole, the method comprising: transforming data in a first trace using transformation(s) selected for the first trace; transforming data in a second trace using transformation(s) selected for the second trace; wherein the first trace and the second trace are traces in a set of dipmeter traces obtained during one traverse of a dipmeter along a borehole; wherein the transformation(s) selected for the first trace differ from transformation(s) selected for the second trace; and wherein the thus transformed first trace and second trace are characterized by data distribution(s) having symmetry and optionally modality more closely approximating a normal data distribution relative respectively to the first and second traces prior to transformation.
Claim 2
Independent Claim
133 words
A method for preprocessing dipmeter traces for subsequent correlation, dip computation, and display of dip angle and direction of structural features intersecting a borehole, the method comprising: transforming data in a first trace using transformation(s) selected for the first trace; transforming data in a second trace using transformation(s) selected for the second trace; wherein the first trace and the second trace are traces in a set of dipmeter traces obtained during one traverse of a dipmeter along a borehole; wherein the transformation(s) selected for the first trace differ from transformation(s) selected for the second trace; and wherein the thus transformed first trace and second trace are characterized by data distribution(s) having symmetry and optionally modality more closely approximating a normal data distribution relative respectively to the first and second traces prior to transformation.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the thus transformed first trace and second trace are characterized by data distributions having a modality more closely approximating a normal data distribution.
Claim 4
Dependent Claim
107 words
The method of claim 1 wherein the step of transforming data in a first trace comprises scanning the first trace for intervals having data distributions not having generally unimodal-symmetric characteristics of a normal data distribution and transforming said intervals to provide data distributions therein which have symmetry and unimodality more closely approximating a normal data distribution; and wherein the step of transforming data in a second trace comprises scanning the second trace for intervals having data distributions not having generally unimodal-symmetric characteristics of a normal data distribution and transforming said intervals to provide data distributions therein which have symmetry and unimodality more closely approximating a normal distribution.
Claim 5
Dependent Claim
16 words
The method of claim 1 further comprising removing structural disinformation from trace(s) prior to such transforming.
Claim 6
Independent Claim
121 words
The method of claim I wherein the step of transforming data in a first trace comprises: scanning the first trace for interval(s) having a data distribution not having generally unimodal-symmetric characteristics of a normal data distribution; resolving such intervals into further subpopulations; and transforming such further subpopulations to provide resulting data distribution(s) having symmetry and unimodality more closely approximating a normal data distribution; and wherein the step of transforming data in a second trace comprises scanning the second trace for interval(s) having data distribution(s) not having generally unimodal-symmetric characteristics of a normal data distribution; resolving such intervals into further subpopulations; and transforming such further subpopulations to provide resulting data distribution(s) having symmetry and unimodality more closely approximating a normal data distribution.
Claim 7
Dependent Claim
33 words
The method of claim 1 further comprising: generating significantly correlated displacement for pairs of traces; and computing and displaying dip angle and direction of formations adjacent the borehole from the significantly correlated displacements.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |