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1. WO2000042448 - METHOD OF ATTENUATING NOISE IN THREE DIMENSIONAL SEISMIC DATA USING A PROJECTION FILTER

Publication Number WO/2000/042448
Publication Date 20.07.2000
International Application No. PCT/GB2000/000058
International Filing Date 12.01.2000
Chapter 2 Demand Filed 03.06.2000
IPC
G01V 1/36 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
1Seismology; Seismic or acoustic prospecting or detecting
28Processing seismic data, e.g. analysis, for interpretation, for correction
36Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
CPC
G01V 1/364
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
1Seismology; Seismic or acoustic prospecting or detecting
28Processing seismic data, e.g. analysis, for interpretation, for correction
36Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
364Seismic filtering
G01V 2210/32
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
2210Details of seismic processing or analysis
30Noise handling
32Noise reduction
G01V 2210/3246
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
2210Details of seismic processing or analysis
30Noise handling
32Noise reduction
324Filtering
3246Coherent noise, e.g. spatially coherent or predictable
Applicants
  • SCHLUMBERGER HOLDINGS LIMITED; P.O. Box 71 Craigmuir Chambers Road Town Tortola, VG (AE, AL, AM, AT, AU, AZ, BA, BB, BE, BF, BG, BJ, BR, BY, CF, CG, CH, CI, CM, CN, CU, CY, CZ, DE, DK, EE, ES, FI, GA, GB, GD, GE, GH, GM, GN, GR, GW, HR, HU, ID, IE, IL, IN, IS, IT, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MC, MD, MG, MK, ML, MN, MR, MW, MX, NE, NL, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, SN, SZ, TD, TG, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW)
  • SCHLUMBERGER CANADA LIMITED [CA/CA]; 24th floor 801 6th Avenue, S.W. Monenco Place Calgary, Alberta T2P 3W2, CA (CA)
  • SERVICES PETROLIERS SCHLUMBERGER [FR/FR]; 42, rue Saint Dominique F-75007 Paris, FR (FR)
  • ÖZBEK, Ali [TR/GB]; GB (UsOnly)
  • ÖZDEMIR, Ahmet, Kemal [TR/TR]; TR (UsOnly)
  • FERBER, Ralf [DE/GB]; GB (UsOnly)
  • ZEROUK, Kamil [GB/GB]; GB (UsOnly)
Inventors
  • ÖZBEK, Ali; GB
  • ÖZDEMIR, Ahmet, Kemal; TR
  • FERBER, Ralf; GB
  • ZEROUK, Kamil; GB
Agents
  • MIRZA, Akram, Karim; Schlumberger Cambridge Research Limited High Cross Madingley Road Cambridge CB3 0EL, GB
Priority Data
9900723.914.01.1999GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD OF ATTENUATING NOISE IN THREE DIMENSIONAL SEISMIC DATA USING A PROJECTION FILTER
(FR) PROCEDE POUR ATTENUER LE BRUIT DANS DES DONNEES SISMIQUES TRIDIMENSIONNELLES A L'AIDE D'UN FILTRE DE PROJECTION
Abstract
(EN)
A method of attenuating noise in three dimensional seismic data using a projection algorithm is disclosed. A frequency-space-space ('f-xy') projection algorithm is used which is a generalization of the f-x projection algorithm. The predictability of the seismic signals in the f-xy domain constitutes the basis of the algorithm. Specifically it is demonstrated that if the seismic events are planar in the t-xy domain, then in the f-xy domain they consist of predictable signals in the xy-plane for each frequency f. A crucial step of the 2-D spectral factorization is achieved through the helical coordinate transformation. In addition to the disclosed general algorithm for arbitrary coherent noise, a specialized algorithm for random noise is disclosed. It has been found that the disclosed projection algorithm is effective even in extreme cases of poor signal to noise ratio. The algorithm is also signal preserving when the predictability assumptions hold.
(FR)
L'invention concerne un procédé permettant d'atténuer le bruit dans des données sismiques tridimensionnelles à l'aide d'un algorithme de projection. Ce procédé consiste tout d'abord à utiliser un algorithme de projection fréquence-espace-espace («$i(f-xy)») qui est une généralisation de l'algorithme de projection $i(f-x), la prévisibilité des signaux sismiques dans le domaine $i( f-xy) constituant la base de cet algorithme. Il est en particulier prouvé que si les événements sismiques sont planaires dans le domaine $i(t-xy), ils sont composés, dans ledit domaine $i( f-xy), par des signaux prévisibles dans le plan $i(xy )pour chaque fréquence $i(f), la transformation des données hélicoïdale constituant une étape cruciale de la factorisation spectrale bidimensionnelle. Outre cet algorithme général permettant d'atténuer le bruit cohérent arbitraire, cette invention concerne également un algorithme destiné particulièrement au bruit aléatoire, l'algorithme de projection susmentionné étant efficace même dans des cas extrêmes de faible rapport signal-bruit et permettant de conserver le signal lorsque les prévisions se vérifient.
Also published as
NO20013501
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