Skip Nav Destination
Close Modal
Search Results for
DMO (dip moveout) processing
Update search
Filter
- Title
- Author
- Author Affiliations
- Full Text
- Abstract
- Keyword
- DOI
- ISBN
- EISBN
- ISSN
- EISSN
- Issue
- Volume
- References
- Paper Number
Filter
- Title
- Author
- Author Affiliations
- Full Text
- Abstract
- Keyword
- DOI
- ISBN
- EISBN
- ISSN
- EISSN
- Issue
- Volume
- References
- Paper Number
Filter
- Title
- Author
- Author Affiliations
- Full Text
- Abstract
- Keyword
- DOI
- ISBN
- EISBN
- ISSN
- EISSN
- Issue
- Volume
- References
- Paper Number
Filter
- Title
- Author
- Author Affiliations
- Full Text
- Abstract
- Keyword
- DOI
- ISBN
- EISBN
- ISSN
- EISSN
- Issue
- Volume
- References
- Paper Number
Filter
- Title
- Author
- Author Affiliations
- Full Text
- Abstract
- Keyword
- DOI
- ISBN
- EISBN
- ISSN
- EISSN
- Issue
- Volume
- References
- Paper Number
Filter
- Title
- Author
- Author Affiliations
- Full Text
- Abstract
- Keyword
- DOI
- ISBN
- EISBN
- ISSN
- EISSN
- Issue
- Volume
- References
- Paper Number
NARROW
Format
Subjects
Journal
Publisher
Conference Series
Date
Availability
1-20 of 426 Search Results for
DMO (dip moveout) processing
Follow your search
Access your saved searches in your account
Would you like to receive an alert when new items match your search?
Sort by
Proceedings Papers
Publisher: Offshore Technology Conference
Paper presented at the Offshore Technology Conference, May 5–8, 1986
Paper Number: OTC-5158-MS
... time To, and the stacked traces are fully migrated. Both DMO and PSI are independent of velocity. The processes do not have to be repeated if the velocity is 2 DIP MOVEOUT AND PRESTACK IMAGING 5158 changed. The selection of velocity is made at the last step when the migrated traces are being stacked...
Abstract
ABSTRACT Dip moveout is presented as a data conditioning process in which a diffraction surface in midpoint-offset-time space is transformed into a surface of revolution. Pre-stack imaging operates on constant-time slices of the data, after dip moveout has been applied, in which diffractions appear as circles, adds data along these circles, and plots the sum at the largest offset point of each circle. After both operations, a standard velocity analysis and stacking algorithm produces a migrated section. Both operations are independent of velocity. INTRODUCTION Two problems commonly associated with CDP stacking are (1) a loss of resolution because the reflection point moves updip as the offset increases and (2) the stacking velocity depends on the dip angle of the reflector. The first problem is particularly severe if the reflection point moves across a fault as it moves updip, as indicated in Figure 1. The second problem means that stacking velocities are not appropriate for migration after stack. Dip moveout (DMO) helps with both problems, as first explained by Judson et al. (1976). There is less loss of resolution because the gathers, after DMO, have events with common reflection points. Also, the stacking velocity is not so dependent on the angle of dip and is more useful for selecting velocities to migrate the data after stack. However, the stacking velocity is estimated at the slant travel time T2 and not at the vertical travel time To, as one would wish. DMO can be followed by another processing step called pre-stack imaging (PSI). After PSI, the data are migrated but not yet stacked. In other words, gathers formed after DMO and PSI have been applied can be stacked using a standard velocity analysis and stack program. In this case, there is no loss of resolution, the stacking velocity gives the root-mean-square velocity at time To, and the stacked traces are fully migrated. Both DMO and PSI are independent of velocity. The processes do not have to be repeated if the velocity is changed. The selection of velocity is made at the last step when the migrated traces are being stacked. Thus the velocity analysis may be more robust because the traces used in the analysis have a better signal to noise ratio. This paper gives an overview of both processes and illustrates the algorithms by showing how a diffraction in multi-fold data is summed and plotted at a point. THREE-STEP PRE-STACK MIGRATION The first step is DMO. Viewing a 2D multi-fold line as a three-dimensional space with axes m (the midpoint coordinate), h (half the offset), and t (time), as shown in Figure 2, we can see that DMO operates on vertical sections with constant h. The original data cube is transformed into a new cube by processing the constant-offset sections one by one.
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-1851
... of converted P-SV data from a real OBC survey: SEG Int'l Exposition and Annual Meeting * San Antonio, Texas * September 9-14, 2001 Summary Converted wave (C-wave) dip moveout (DMO) is one of the main procedures for multi-component seismic data processing. In this work, we derive a C-wave DMO...
Abstract
Summary Converted wave (C-wave) dip moveout (DMO) is one of the main procedures for multi-component seismic data processing. In this work, we derive a C-wave DMO formula based upon a second-order approximate trajectory equation of conversion-points, and further propose a fast algorithm in frequency-wavenumber ( f-k ) domain. With Cwave DMO process, the common-conversion-point (CCP) migrates to the common-middle-point (CMP). Impuse responses and a real OBC data example are presented. Introduction Compared with traditional single-component seismic data, multi-component data, in which both P- and S-waves may exist, can provide much more valuable information of subsurface structure and lithology. Processing of multicomponent data is substantially more complex than P-wave processing (Tatham,1993).
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-0248
... approximately equivalent isotropic data set. azimuthal direction velocity structure velocity anisotropy hti media operator reservoir characterization dmo operator imaging dip moveout anisotropy approximation moveout annual international meeting intrinsic anisotropy emo seismic data...
Abstract
ABSTRACT Seismic reflection data exhibiting the effects of azimuthal velocity variation can be generated by waves propagating through geologic layers containing intrinsic horizontal transverse isotropic (HTI) velocity anisotropy, or through isotropic layers deformed into complex 3D velocity structures, or through both. Most current approaches to processing such data attempt to compensate separately for one physical mechanism or the other, but not both simultaneously. Many azimuthal anisotropy (AA) processing flows initially assume zero structural dip to calculate an azimuthal residual moveout (RMO) correction that flattens CMP gathers after standard isotropic normal moveout. Other approaches initially assume no intrinsic HTI velocity anisotropy in order to generate isotropic migration image gathers, which subsequently are flattened through an azimuthal RMO operator. Both approaches address intrinsic anisotropy and complex 3D structure separately, where in fact both effects may be coupled in the data. This leads to velocity estimation errors and degraded image quality, especially for large offsets, strong velocity anisotropy, and steep geologic dips. The most accurate solution to this problem is to perform iterative full anisotropic prestack depth migration velocity analysis, but this is impractical with current computational resources. For elliptical HTI media and complex 3D structure, we develop a computationally efficient anisotropic elliptical moveout (EMO) operator to precondition and regularize seismic wavefields by incorporating azimuthal velocity profile ellipticity. Forward and adjoint elliptical DMO operators are cascaded together to form a single EMO operation,which has a skewed saddle-like impulse response resembling that of the isotropic azimuthal moveout (AMO) operator, and can correct structural dip image errors commonly 10–20° or more for typical far offset and ellipticity values. EMO can be used to improve imaging results by data regularization to interpolate the azimuthally anisotropic seismic wavefield, and/or by applying data preconditioning to create an approximately equivalent isotropic data set.
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-1213
...(Thomsen, 1986). Here we show that that the traditional Conventional dip-moveout (DMO) processing is designed processing sequence of NM0 followed by isotropic DMO is for isotropic media and cannot handle angle-dependent ve- also valid for elliptically anisotropic data. However, Paper I locity. We show that...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1204
... correction constant velocity dmo depth-variable velocity craig ly artiey dmo reflection point mapping dmo mapping Dip-Moveout Processing for Depth-Variable Velocity SM4.5 Craig lY Artiey, Center for Wave Phenomena, Colorado School of Mines SUMMARY Dip moveout processing (DMO) attempts to transform...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-1221
... dmo houston alfonso gonzales coherency maximum coherency algorithm transverse isotropy Effect of transverse isotropy on dip-moveout processing Kathy K. Roldan*, AGL,University of Houston; Alfonso Gonzales, Western Geophysical; and Dan A. Ebrom, AGL, University of Houston SM2.5 SUMMARY The...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-0769
... the shot to the receiver in such a way that migration of the replacement traces produces the same result as prestack migration of the original trace. This result can be used as the basis for dip moveout (DMO) processing (Fore1 and Gardner, J988). The replacement procedure can be quantified as a...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1740
... fault-plane reflection dip moveout geophy upstream oil & gas Azimuth moveout vs. dip moveout in inhomogeneous media Biondo Biondi, Stanford University SUMMARY Dip moveout (DMO) is often applied to prestack data to better pre- serve dipping events when performing partial stacks over ranges of...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1984 SEG Annual Meeting, December 2–6, 1984
Paper Number: SEG-1984-0796
... dip-indepen- dent rms velocities by performing conventional velocity analysis on PSPM-processed CDP gathers. Together with NM0 the PSPM process might be considered as a dip- corrected normal moveout, which is the reason for naming the process dip moveout (DMO). An intuitive good under- standing of the...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1987 SEG Annual Meeting, October 11–15, 1987
Paper Number: SEG-1987-0726
... correction process cmp interval interpolation implementation jakubowicz Dealiasing the Dip Moveout Correction Process Mark S. Egan, Kenneth L. Craft, and David D. Nguyen, Geophysical Service Inc. s 14.4 SUMMARY to simply as "DMO") has added a twist to some of these interpolation issues. A The need for...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1744
... formulation migration moveout zero-offset image input data A comparative overview of dip moveout methods Paul J. Fowler, Western Geophysical, Denver, Colorado Summary Dip moveout (DMO) is useful both for imaging and for velocity analysis. It is often derived and implemented as a process acting on...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-1529
... ABSTRACT No preview is available for this paper. operator amplitude correction reflector seimsic processing 4 dmo method weighting scheme depth-variable velocity spherical divergence expl dmo operator dmo process correction factor dip moveout reservoir characterization...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1992 SEG Annual Meeting, October 25–29, 1992
Paper Number: SEG-1992-0979
... suncorrected for dip (gray), after DMO cor- rection with a ~(2) DMO process (black), and after DMO correction with a constant-velocity DMO process (dotted). (b) Residual moveout At at offset X = 3000 m as a function of reflector dip for the same shale-limestone data uncorrected (gray), DMO corrected with W(Z...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1181
... oil field research dmo moveout velocity reservoir characterization dmo algorithm Dip Moveout in Vertically Varying Media Dean Witte, Chevron Oil Field Research Summary Conventional constant velocity dip moveout is inadequate for processing reflections from steeply dipping and overtumed...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1191
... ABSTRACT No preview is available for this paper. correction knowledge mode-converted wave dip moveout gardner constant-velocity medium true zero-offset reflection time seismic migration 4 reflection point dmo normal wave equation upstream oil & gas transformation...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1301
... near-surface condition reservoir characterization fdp reflector horizontal reflector Dip Moveout in Cases of Irregular Surfaces S. Rodriguez*, .l f? Diet, and D. Paturet, CGG, France SM7.7 SUMMARY Conventional DMO algorithms assume that recording surfaces can be considered as being horizontal...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-1362
... d and incident angle i, the value of this second-order derivative at the peak is Fore], D., and Gardner, G.H.F., 1988, A three-dimensional perspective on two-dimensional dip moveout: Gee- physics, 53, 604-610. Gardner, G.H.F., and Forel, D., 1988, Amplitude preser- vation equations for DMO: 58th Ann...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1736
... to determining the velocity, or deriv e the v elocity estimates from some non-seismic source. What would be required is a rev ersal of the conventional processing sequence: V elocity Analysis (VA), Normal Moveout (NMO) Correction, Dip Moveout (DMO), Stack, (S) and P ost-Stac k Migration (PsSM) to...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1989 SEG Annual Meeting, October 29–November 2, 1989
Paper Number: SEG-1989-1133
... salthn model amplitude reflection coefficient dip moveout velocity scan dmo Seismic Processing 2: Dip Moveout/Offset-Dependent Processing Monday Afternoon Dip Moveout as a Point-Scattering Phenomenon Michael G. Gibbins, Western Atlas International SUMMARY Dip Moveout (DMO) is a time contrac- tion...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 1988 SEG Annual Meeting, October 30–November 3, 1988
Paper Number: SEG-1988-1101
... characterization formulation Seismic 17 - Dip-Moveout (DMO) Processing Comparative Anatomy of Common Offser Dip Moveout Christopher L. Liner and Norman Bleistein, Center for Wave Phenomena, Colorado School of Mines s 17.1 SUMMARY The methods and implications of fast log-stretch Dip Moveout (DMO) formulations...
Advertisement