Tau-P filters for removal of noise from seismic data
US007366054B1
(12) United States Patent
(10) Patent N0.2
Wood (54)
US 7,366,054 B1
(45) Date of Patent:
TAU-P FILTERS FOR REMOVAL OF NOISE
*Apr. 29, 2008
OTHER PUBLICATIONS
FROM SEISMIC DATA
_
_
Moon, Woolr, et al. “Radon Transform wave ?eld separation for
(75)
Inventor:
Lawrence C. Wood, Houston, TX (US)
vertical seismic pro?ling data.” Geophysics, vol. 51, No. 4 (Apr.
(73) Assignee: John M. Robinson, Houston, TX (US) (*)
Notice:
l986)'*
(Continued)
Subject to any disclaimer, the term of this patent is extended or adjusted under 35
Primary Examinerilack Keith Assistant ExamineriScott A Hughes
U'S'C' 154(b) by 0 days' This patent is subject to a terminal disclaimer.
(74) Attorney, Agent, or FirmiKeith B. Willhelm 57
(21) Appl. No.: 11/647,935 (22)
Filed:
Dec. 29, 2006
Methods of processing seismic data to remove unwanted
(Under 37 CFR 1.47)
noise from meaningful re?ection signals are provided for. The methods comprise the steps of assembling seismic data
Related U-s- Application Data
(63)
(52)
into common geometry gathers in an o?‘set-time domain
Continuation of application NO 11/075,326’ ?led on
without correcting the data for normal moveout. The ampli
Mar' 8 2005 which is a Continuation of application NO 10/238 366 ?led on Sep 10 2002 HOW Pat NO
tude data are then transformed from the o?‘set-time domain to the time-slowness domain using a Radon transformation.
6,987,706’ which is a continuation_in_pan of app1i_
A corrective ?lter is then applied to enhance the primary
Cation NO 10/232 118 ?led on Aug' 30 2002 HOW Pat NO_ 6 691 039_
re?ection signal content of the data and to eliminate unwanted noise events. The corrective ?lter has a pass
’
(51)
ABSTRACT
( )
’
region with a lower pass limit and a higher pass limit. The
Int; CL
higher pass limit is set within 15% above the slowness of the
G01 V 1/30
(200601)
G01V1/32
(200601)
primary re?ection signals and, preferably, it is more closely set to the slowness of the primary re?ection signals. The
us. Cl. .......................... .. 367/43; 367/47; 367/49;
lower Pass 11mins also Preferably Set Within 15% below the
702/16. 702/17 ,3 67 /2 4
slowness of the primary re?ection signals. The tau-P ?lter preferably is de?ned by reference to the velocity function of
/16i17’
the primary re?ection signals, and preferably is expressed
(58) Field of Classi?cation Search
367/38
See application ?le for complete search history.
(56)
as:
References Cited l
U.S. PATENT DOCUMENTS 4,594,693 A *
6/1986
Pann et al.
(12) United States Patent
(10) Patent N0.2
Wood (54)
US 7,366,054 B1
(45) Date of Patent:
TAU-P FILTERS FOR REMOVAL OF NOISE
*Apr. 29, 2008
OTHER PUBLICATIONS
FROM SEISMIC DATA
_
_
Moon, Woolr, et al. “Radon Transform wave ?eld separation for
(75)
Inventor:
Lawrence C. Wood, Houston, TX (US)
vertical seismic pro?ling data.” Geophysics, vol. 51, No. 4 (Apr.
(73) Assignee: John M. Robinson, Houston, TX (US) (*)
Notice:
l986)'*
(Continued)
Subject to any disclaimer, the term of this patent is extended or adjusted under 35
Primary Examinerilack Keith Assistant ExamineriScott A Hughes
U'S'C' 154(b) by 0 days' This patent is subject to a terminal disclaimer.
(74) Attorney, Agent, or FirmiKeith B. Willhelm 57
(21) Appl. No.: 11/647,935 (22)
Filed:
Dec. 29, 2006
Methods of processing seismic data to remove unwanted
(Under 37 CFR 1.47)
noise from meaningful re?ection signals are provided for. The methods comprise the steps of assembling seismic data
Related U-s- Application Data
(63)
(52)
into common geometry gathers in an o?‘set-time domain
Continuation of application NO 11/075,326’ ?led on
without correcting the data for normal moveout. The ampli
Mar' 8 2005 which is a Continuation of application NO 10/238 366 ?led on Sep 10 2002 HOW Pat NO
tude data are then transformed from the o?‘set-time domain to the time-slowness domain using a Radon transformation.
6,987,706’ which is a continuation_in_pan of app1i_
A corrective ?lter is then applied to enhance the primary
Cation NO 10/232 118 ?led on Aug' 30 2002 HOW Pat NO_ 6 691 039_
re?ection signal content of the data and to eliminate unwanted noise events. The corrective ?lter has a pass
’
(51)
ABSTRACT
( )
’
region with a lower pass limit and a higher pass limit. The
Int; CL
higher pass limit is set within 15% above the slowness of the
G01 V 1/30
(200601)
G01V1/32
(200601)
primary re?ection signals and, preferably, it is more closely set to the slowness of the primary re?ection signals. The
us. Cl. .......................... .. 367/43; 367/47; 367/49;
lower Pass 11mins also Preferably Set Within 15% below the
702/16. 702/17 ,3 67 /2 4
slowness of the primary re?ection signals. The tau-P ?lter preferably is de?ned by reference to the velocity function of
/16i17’
the primary re?ection signals, and preferably is expressed
(58) Field of Classi?cation Search
367/38
See application ?le for complete search history.
(56)
as:
References Cited l
U.S. PATENT DOCUMENTS 4,594,693 A *
6/1986
Pann et al.
