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  • {{#category_index:D|density contrast}} The difference in density between two formations or rock units. Lateral density contrasts are responsible for lateral changes in the Earth’s gravity
    282 bytes (37 words) - 19:45, 31 August 2018
  • {{#category_index:D|density contrast}} The difference in density between two formations or rock units. Lateral density contrasts are responsible for lateral changes in the Earth’s gravity
    223 bytes (31 words) - 20:46, 31 August 2018
  • 203 bytes (29 words) - 15:27, 27 November 2018

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  • ...of incidence or source-geophone distance. Depends on changes in velocity, density, and Poisson's ratio. Often used as a hydrocarbon gas indicator because gas ...ss 2</b> are those with very small, either positive or negative, impedance contrast, and <b>class 3</b> are low-impedance reservoirs. In Tertiary clastic secti
    3 KB (408 words) - 16:24, 8 September 2020
  • ...<b>6. Gravity</b> or <b>density basement</b> is where a very large density contrast exists so that anomalies resulting from deeper contrasts are lost in the no
    1 KB (210 words) - 12:55, 30 October 2017
  • {{#category_index:D|density basement}} Where a very large density contrast exists so that anomalies resulting from deeper contrasts are lost in the no
    241 bytes (32 words) - 15:16, 21 November 2018
  • {{#category_index:D|density contrast}} The difference in density between two formations or rock units. Lateral density contrasts are responsible for lateral changes in the Earth&#x2019;s gravity
    282 bytes (37 words) - 19:45, 31 August 2018
  • Where a very large density contrast exists so that anomalies resulting from deeper contrasts are lost in the no
    307 bytes (39 words) - 05:58, 22 February 2017
  • ...se mass per unit of length is &#x03C1;''A'', where &#x03C1; is the density contrast and ''A'' is the cross-sectional area of the cylinder.
    471 bytes (71 words) - 14:03, 25 July 2017
  • For bodies having both uniform susceptibility and density contrast, the magnetic potential is directly proportional to the derivative of the g
    315 bytes (41 words) - 13:34, 11 June 2020
  • ...cial:MyLanguage/Dictionary:reflection|''reflection'']] (q.v.). <b>2</b>. A contrast in electrical properties that gives rise to an electromagnetic reflection.
    383 bytes (50 words) - 01:15, 11 June 2017
  • ...s nonlinearly with charging current, probably due to exceeding the current-density limit of the polarizable body. <b>5</b>. The extent to which ''hue'' (q.v.)
    1 KB (172 words) - 00:58, 15 March 2017
  • ...he partition of energy when a plane wave impinges on an acoustic-impedance contrast. In the general case for an interface between two solids when the incident ...for how the reflection amplitudes vary with the rock properties involved (density, velocity etc.), so approximations are useful.
    9 KB (1,422 words) - 20:35, 19 September 2020
  • ...C1;''n'', where ''k'' is a scale constant, &#x0394;&#x03C1; is the density contrast, ''n'' is the number of dots lying in the anomalous mass when superimposed
    337 bytes (61 words) - 16:29, 20 December 2011
  • ...ions for reflected P-waves as a function of density ratio; P-wave velocity contrast 1.5, Poisson's ratio 0.25. (From Tooley et al., 1965.)
    864 bytes (126 words) - 11:13, 2 March 2020
  • answers: "(1) How thick does a bed providing a given velocity contrast have to be to give a reflection? (2) How important are density contrasts in
    4 KB (568 words) - 12:21, 18 October 2016
  • ...he recorded seismic trace provided by seismic impedance — the product of density and velocity. The first set of assumptions that is used to build the forwar ...s the seismic impedance associated with each layer given by the product of density ''ρ'' and compressional velocity ''v''.
    11 KB (1,590 words) - 08:01, 18 September 2014
  • ...uct of density and velocity is called ''seismic impedance''. The impedance contrast between adjacent rock layers causes the reflections that are recorded along
    7 KB (1,000 words) - 15:32, 4 August 2014
  • ...[[Dictionary:Acoustic_impedance|acoustic impedance]] [[Dictionary:Contrast|contrast]] varies for different source wavelets. ...re is a well-known and consistent acoustic impedance [[Dictionary:Contrast|contrast]]. Equally important is to ensure that this boundary is sharp (step-like)
    10 KB (1,354 words) - 15:12, 8 December 2014
  • ...nges in velocity gradient and refraction at layer boundaries with velocity contrast. Reflection points along each of the raypaths are identified as the interse ...ace do not coincide with the salt sill boundary where the largest velocity contrast exists. Problems with ray tracing through a complex model as outlined above
    5 KB (717 words) - 08:01, 2 October 2014
  • ...orehole. Logs that are most relevant to seismic data are sonic, shear, and density. Another category of well data is a vertical seismic profile (VSP) ([[verti ...eservoir boundary may be too small to detect, whereas shear-wave impedance contrast may be sufficiently large to detect. By recording multicomponent data at th
    6 KB (828 words) - 10:31, 22 September 2014
  • ...ary:Velocity_contrast|velocity]] and [[Dictionary:Density_contrast|density contrast]], the energy of the incident wave is partitioned at each boundary. Specifi
    4 KB (585 words) - 16:50, 6 October 2014
  • where ''ρ'' is density of the medium, and ''λ'' and ''μ'' are Lamé’s constants (equations [[M Define the product of density and velocity as the seismic impedance, ''I'' = ''ρα''. If there is a diff
    19 KB (2,801 words) - 16:57, 6 October 2014

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