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Wraparound

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Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-388
.... From 45 total strain readings, 38 were less than 50% error, and 27 were less than 25% error. All four methods of attaching the cable were equally successful: epoxy entire length, grout entire length, epoxy ends, and wraparound ends. Further testing should be done outdoors and/or underground...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2944
... to their dips. However, wraparound effects due to spatial aliasing lead to systematic errors in the separation as aliased events map to dips lower than the true ones. This is a major problem of frequency-wavenumber domain implementations especially for 3-D acquisition geometries with large streamer separation...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2132
... that for a single reflecting horizon, or a set of nearby horizons, the effects of temporal wraparound can be neglected. The output of this process is a migrated image of the target structure showing illumination effects due to overburden velocity structure and acquisition sampling. Introduction It is often...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2512
... wraparound artifacts and (2) Fourier spatial interpolation does nothing whatsoever to reduce aliasing artifacts. Introduction The fundamental principle of surface-related multiple prediction is that the upcoming energy recorded at any given trace location in a shot produces a downgoing reflected...
Proceedings Papers

Paper presented at the CORROSION 2006, March 12–16, 2006
Paper Number: NACE-06263
... ultrasonic guided waves on pipe or tubes, a wraparound transducer typical of that illustrated in Figure 2 can be used. A variety of different sensor types could be considered for a particular tube diameter including for example piezoelectrics, electromagnetic acoustic transducers, magnetostrictive sensors...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1925
... ABSTRACT No preview is available for this paper. seg 3D Spectral reverse time migration with no-wraparound absorbing conditions Ernesto Bonomi, Leesa Brieger, Carlo Nardone, and Enrico Pieroni, Geophysics Area, CRS4 Summary Comparative studies of methods of reverse time migra- tion...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, March 15–18, 1987
Paper Number: SPE-16122-MS
... operations. The design features of the new ISWE which directly correspond to flanged equipment are: The tubing load is transferred to the casing head body. The production casing is enclosed with an externally testable O-Ring seal. The internal components such as the stripper rubber, wraparound...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 5–8, 1980
Paper Number: OTC-3809-MS
... produces a "wide band" stationary phase record in time, which shows the correct move out and amplitude variation of the reflections with offset. This time domain method allows arbitrary offset distances and there is no wraparound in time and distance on the final profile, two common problems in frequency...
Proceedings Papers

Paper presented at the 1988 SEG Annual Meeting, October 30–November 3, 1988
Paper Number: SEG-1988-1258
... Wang, Univ. of Calgary, Canada SUMMARY The method works in the time domain. In this way, all the artifacts associated Image processing techniques have with frequency domain methods, like ringing wraparound effects as in F-K filtering are recently been applied to seismic data for not present...
Proceedings Papers

Paper presented at the 1984 SEG Annual Meeting, December 2–6, 1984
Paper Number: SEG-1984-0786
... ABSTRACT No preview is available for this paper. frequency interpolation interface continuation reflector model wedge wraparound ray reference velocity reservoir characterization source position forward modeling fourier transform depth migration propagation inverse...
Proceedings Papers

Paper presented at the 1985 SEG Annual Meeting, October 6–10, 1985
Paper Number: SEG-1985-0526
... ABSTRACT No preview is available for this paper. time-domain correlation time domain wraparound correlator sequence relative computational speed fourier transform accuracy frequency-domain correlation reservoir characterization correlation cyclic convolution data quality...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-0192
...) recursive algorithm for time migration. We use Levin s wraparound filter (Claerbout, 1985) in order to parallelize over temporal frequencies. We have applied a variety of optimizations including emphasizing scalar (rather than vector) temporaries in loops, converting to 32-bit data types, and using...
Proceedings Papers

Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-0684
... root (DSR) equation in common midpoint and offset coordinates for prestack migration produces notable artifacts that are routinely attributed to Fourier domain wraparound in the offset wavenumber space. These artifacts usually pre- clude the use of DSR for separate common-offset sections. I show...
Journal Articles
SPE Prod & Oper 13 (02): 109–117.
Paper Number: SPE-37436-PA
Published: 01 May 1998
... to 24°API oil production. An Accuflow System was selected in place of another conventional test separator. The multiphase-metering system has a wraparound design, as shown schematically in Fig. 4, and uses a 1-in. Rosemount vortex meter to measure the gas flow and a 1-in. Micro Motion meter (Model...
Proceedings Papers

Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-1343
... as a standard slant stack except that some p traces have a high cut filter applied. The advantage for inversion of the modified slant stack is that each point in the (K, F) diagram is picked out by only one radial line. The confusion in the standard slant stack is caused by the wraparound which means that each...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2344
... of 3D Kirchhoff migration Figure 7: Kirchhoff migration impulse response using the three-filter cascade approach (displayed with a huge gain 200 db) show the pres- ence of the beams of noise associated with frequency domain artifacts of the cascaded filters (wraparound). in a better frequency response...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1295
... to a factor of two, corresponding to a 60° maximum propagation angle. To implement the phase-shift with few artifacts, we used the operator dip control of Levin (1983) to suppress wraparound. For constant velocity, the relevant limits for p = |k and aperture radius r are (3) = " 1 and (4) = 4 , where...
Proceedings Papers

Paper presented at the 1984 SEG Annual Meeting, December 2–6, 1984
Paper Number: SEG-1984-0627
... in the applica- tion of discrete solution methods to wave propagation prob- lems is the presence of reflections or wraparound from the boundaries of the numerical mesh. In this paper we describe a scheme for the elimination of these unwanted events which can be applied to a wide class of wave equations...
Proceedings Papers

Paper presented at the 1984 SEG Annual Meeting, December 2–6, 1984
Paper Number: SEG-1984-0784
... Gazdag s phase-shift-plus-interpolation (PSPI) method is modified to compute stacked profiles based on the exploding reflector model. A point scatterer model is used to illustrate the wraparound problem caused by the use of Fourier transforms and how the effect can be suppressed by absorb- ing energy...
Proceedings Papers

Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-1578
.... Hence an expression for the filter is ~-2niIhl PlP)/10~ (10) Figure 2 shows the result of applying this filter to a wavelet in a single column in a 48 x 48 m versus s sectfon. Note that a wavelet is spread along a parabola but the wraparound creates a noisy 3ackground. This noise can be attenuated...

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