GB1208424A - Optimum seismic velocity filters - Google Patents
Optimum seismic velocity filtersInfo
- Publication number
- GB1208424A GB1208424A GB4788567A GB4788567A GB1208424A GB 1208424 A GB1208424 A GB 1208424A GB 4788567 A GB4788567 A GB 4788567A GB 4788567 A GB4788567 A GB 4788567A GB 1208424 A GB1208424 A GB 1208424A
- Authority
- GB
- United Kingdom
- Prior art keywords
- trace
- moveout
- filtering
- filters
- coherent noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001427 coherent effect Effects 0.000 abstract 4
- 238000001914 filtration Methods 0.000 abstract 4
- 239000002131 composite material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
1,208,424. Seismic prospecting. MOBIL OIL CORP. 20 Oct., 1967, No. 47885/67. Heading H4D. A method of filtering coherent noise from n seismic data traces derived from n spaced detectors in response to generation of a seismic disturbance comprises applying each of the traces to a different one of n filters each having an amplitude spectrum G j (#) given by the equation: where i is #-1, e is the base of Naperian logarithms, j represents successive integers between - n/2 and +n/2 (excluding zero), m represents successive integers betweenn/2 and +n/2 (excluding zero), # is the frequency of the seismic disturbance, T is the primary reflection moveout per trace, #T is the coherent noise moveout per trace, a j is a number equal to the distance from a reference point to the detector producing the jth trace divided by the spacing between successive detectors, am is a similar number for the mth trace, # mj is equal to 1 for m=j but is otherwise zero, R N (#) is the coherent noise-to-signal ratio, R U (#) is the random noise-to-signal ratio, p(#) is an assumed probability density function for primary reflection moveout, and #p(##) is an assumed probability density function for coherent noise moveout and summing the outputs of the filters to form a composite trace. Details are given of a FORTRAN programme for computing filter coefficients; the actual filtering may be done by digital computer or by analogue timedomain filters. The filtering separates primary and multiple reflections on the basis of their difference in apparent horizontal propagation velocities, permits upper and lower limits to be set on the velocities suppressed by the filtering, and permits account to be taken of the dependence of R N and R U on frequency for obtaining optimum suppression of multiple reflections.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4788567A GB1208424A (en) | 1967-10-20 | 1967-10-20 | Optimum seismic velocity filters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4788567A GB1208424A (en) | 1967-10-20 | 1967-10-20 | Optimum seismic velocity filters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1208424A true GB1208424A (en) | 1970-10-14 |
Family
ID=10446602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4788567A Expired GB1208424A (en) | 1967-10-20 | 1967-10-20 | Optimum seismic velocity filters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1208424A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0201643A1 (en) * | 1985-05-06 | 1986-11-20 | Western Atlas International, Inc. | Seismic noise suppression |
WO2013163131A1 (en) | 2012-04-23 | 2013-10-31 | Westerngeco Llc | Attenuating noise acquired in an energy measurement |
-
1967
- 1967-10-20 GB GB4788567A patent/GB1208424A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0201643A1 (en) * | 1985-05-06 | 1986-11-20 | Western Atlas International, Inc. | Seismic noise suppression |
WO2013163131A1 (en) | 2012-04-23 | 2013-10-31 | Westerngeco Llc | Attenuating noise acquired in an energy measurement |
EP2841966A4 (en) * | 2012-04-23 | 2016-06-22 | Westerngeco Llc | Attenuating noise acquired in an energy measurement |
US9638816B2 (en) | 2012-04-23 | 2017-05-02 | Westerngeco L.L.C. | Attenuating noise acquired in an energy measurement |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |