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  • ..., 2-D [[migration]] of this 2-D cross-section of a 3-D wavefield would not yield the correct subsurface image. ...imaging of the 3-D subsurface geology. In contrast, 2-D [[migration]] can yield inadequate results. The difference between 2-D seismic and 3-D seismic is t
    279 KB (43,590 words) - 08:31, 29 August 2014
  • ...tions by suppressing noise of various types. ''Processing, however, cannot yield signal from field data without signal''. At best, it suppresses whatever no ...nd eventually dominates. Unfortunately, gain corrections to restore signal strength at later times boost random noise in the process. Fortunately, CMP stack su
    6 KB (873 words) - 14:58, 28 August 2014
  • ...the synthetic traces were blended with a band-limited random noise, whose strength varied spatially. (The noise level was set to zero at both ends of the prof ...or data with a narrow bandwidth or high noise level, crosscorrelation can yield a multiple number of peaks and cause uncertainty in the estimated time shif
    10 KB (1,565 words) - 08:40, 19 September 2014
  • ...]] is applicable, and ray-paths associated with nonzero-offset traveltimes yield a moveout behavior that makes it possible to estimate layer velocities with ...esponds to the base-Zechstein boundary. It is not just flatness, but event strength and continuity across the offset axis of the image gather, that we take int
    190 KB (29,309 words) - 13:41, 10 September 2014
  • ...orizontal axis in both plots denotes induration which is a measure of rock strength. ...utes]] derived from the stacked section in Figure 11.3-1: (a) reflectivity strength, (b) phase, (c) frequency, and (d) smoothed frequency.
    395 KB (60,721 words) - 13:42, 10 September 2014
  • ...esponds to the base-Zechstein boundary. It is not just flatness, but event strength and continuity across the offset axis of the image gather, that we take int .... It is the substratum region where 3-D prestack depth [[migration]] would yield an improved image. The differences in amplitude characteristics and the ban
    17 KB (2,605 words) - 16:06, 2 October 2014
  • The line marking the limit of porosity is fixed by the strength of the rock matrix that is presumed to be carrying the major part of the we ...dip and strike seismic lines, will velocity analyses at line intersections yield the same values?'''
    68 KB (9,931 words) - 08:10, 21 June 2018
  • ...ngs of geophones, each having four equally spaced elements, be laid out to yield a triangular array?''' ...of interest might yield useful shallow information, for example, it might yield data less confused by source-generated wavetrains, such as ground roll.
    84 KB (12,965 words) - 13:30, 6 June 2018
  • Faults are breaks produced by stresses that exceeded the rock strength. The most important basic types are: (1) ''normal faults'' caused by extens ...the shale is deposited, cannot escape; as a result, the shale loses shear strength and becomes somewhat fluid (diapiric). Shale diapirs “freeze” into plac
    78 KB (11,396 words) - 08:12, 21 June 2018
  • ...hy does [[Special:MyLanguage/spiking deconvolution|spiking deconvolution]] yield a degraded output for case 2? Does this also happen for case 1, when the wa ...arrives first and determines the listener’s perception of the location, strength, and nature of the sound source. A few closely spaced echoes, called early
    22 KB (3,335 words) - 09:26, 6 May 2021
  • ...portrays information about reflection strength. In particular, reflection strength is a measure of the reflectivity and provides information about impedance c ...subtraction of arrival times or amplitudes of successive horizon slices to yield various kinds of difference displays, (4) effective illumination of a horiz
    19 KB (2,721 words) - 12:45, 6 May 2021
  • ...hy does [[Special:MyLanguage/spiking deconvolution|spiking deconvolution]] yield a degraded output for case 2? Does this also happen for case 1, when the wa ...arrives first and determines the listener’s perception of the location, strength, and nature of the sound source. A few closely spaced echoes, called early
    21 KB (3,215 words) - 09:28, 6 May 2021
  • ...hy does [[Special:MyLanguage/spiking deconvolution|spiking deconvolution]] yield a degraded output for case 2? Does this also happen for case 1, when the wa ...arrives first and determines the listener’s perception of the location, strength, and nature of the sound source. A few closely spaced echoes, called early
    21 KB (3,189 words) - 09:26, 6 May 2021
  • ...portrays information about reflection strength. In particular, reflection strength is a measure of the reflectivity and provides information about impedance c ...subtraction of arrival times or amplitudes of successive horizon slices to yield various kinds of difference displays, (4) effective illumination of a horiz
    18 KB (2,619 words) - 12:46, 6 May 2021
  • ...portrays information about reflection strength. In particular, reflection strength is a measure of the reflectivity and provides information about impedance c ...subtraction of arrival times or amplitudes of successive horizon slices to yield various kinds of difference displays, (4) effective illumination of a horiz
    18 KB (2,633 words) - 13:48, 6 May 2021