US4392109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static correction for magnetotelluric data
Assignee: Mobil Oil AS
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Filing: 1980-11-14
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Granted: 1983-07-05
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Expires: 2000-11-14
Abstract
Abstract A method for removing the effects of said subsurface anomalies in magnetotelluric survey data is disclosed wherein resistivity curves are compared and a correction factor is determined. Resistivity curves having a deviation from a mean are multiplied by this correction factor.
Inventors
- 👤 Barry N. Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:46
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/38; G01V3/08; G01V3/082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A method for correcting near surface resistive anomalies in magnetotelluric surveys comprising the steps of: receiving magnetotelluric survey data curves; selecting a portion of each curve; computing an average for said portion of each curve; determining a mean value and variance limit for said averages; selecting all curves having said average portion exceeding said variance limit; multiplying said selected curves by a ratio of said average of each curve and said mean value to correct said selected curves; and displaying said corrected curves and said curves having said average portion within said variance limit.
Claim 2
Independent Claim
94 words
A method for correcting near surface resistive anomalies in magnetotelluric surveys comprising the steps of: receiving magnetotelluric survey data curves; selecting a portion of each curve; computing an average for said portion of each curve; determining a mean value and variance limit for said averages; selecting all curves having said average portion exceeding said variance limit; multiplying said selected curves by a ratio of said average of each curve and said mean value to correct said selected curves; and displaying said corrected curves and said curves having said average portion within said variance limit.
Claim 3
Dependent Claim
95 words
Apparatus for correcting subsurface resistive anomalies in magnetotelluric surveys comprising: means for receiving magnetotelluric survey data for each of a plurality of sites; means for computing an average for preselected depth points for each of said sites; means for determining a mean value and variance limits for said averages of said sites; means for producing a ratio of said mean value and said average for each site; means for multiplying the value of every data point from each site by said ratio to produce corrected magnetotelluric data; and means for displaying said corrected magnetotelluric data.
Claim 4
Dependent Claim
95 words
Apparatus for correcting subsurface resistive anomalies in magnetotelluric surveys comprising: means for receiving magnetotelluric survey data for each of a plurality of sites; means for computing an average for preselected depth points for each of said sites; means for determining a mean value and variance limits for said averages of said sites; means for producing a ratio of said mean value and said average for each site; means for multiplying the value of every data point from each site by said ratio to produce corrected magnetotelluric data; and means for displaying said corrected magnetotelluric data.
References Cited (Backward Citations)
US3264555A
Cited
US4286218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |