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• Seismic inversion
  ...in the low frequency component from the geological model. The result is a frequency band-limited version of the original sonic logs. This is shown in [[:file:s
  8 KB (1,196 words) - 18:48, 21 January 2022
• Synthetic seismogram
  ...ncy over the entire survey. Care should be taken to choose a wavelet whose frequency is similar to a key interval of the seismic data to which it will be compar
  8 KB (1,199 words) - 13:57, 24 January 2022
• Magnetotelluric data acquisition
  ...source<ref name=ch16r3>Goldstein, M. A., and D. W. Strangway, 1975, Audio-frequency magnetotellurics with a grounded electrical dipole source: Geophysics, vol. The predominant low-frequency ( 1.0 Hz) source is equatorial thunderstorm activity.
  5 KB (706 words) - 15:11, 31 January 2022
• Fracture trap regime
  ...on from these high-permeability fracture swarms to areas of lower fracture frequency or fracture permeability often provides local lateral trap boundaries withi
  7 KB (895 words) - 16:04, 13 April 2022
• Cross-borehole tomography
  ...aphy measures the velocity of sound at seismic frequencies, usually in the frequency range of 20 Hz to as high as several kilohertz. Sonic logs represent the me * Piezoelectric (pulsed or swept frequency)
  14 KB (2,060 words) - 20:51, 19 January 2022
• Statistics overview
  ...d by their number. The ''mode'' is the value that occurs with the greatest frequency, and the ''median'' is the value that has as many values above it as below ...of occurrence declines toward extreme values. There are several shapes of frequency distributions that commonly occur in nature. Data sets that are symmetrical
  16 KB (2,483 words) - 19:28, 19 January 2022
• Electrical methods
  ...thin the rock. The average resistivity can be considered constant over the frequency range of interest to most of the methods under consideration here. In the ''DC method'', a current (usually a very low frequency square wave and not actually direct current) is injected into the earth thr
  15 KB (2,130 words) - 21:19, 19 January 2022
• Early carbonate diagenesis
  * [[Sequences during low-amplitude, high-frequency cycles]] * [[Sequences during moderate-amplitude, high-frequency cycles]]
  10 KB (1,352 words) - 19:07, 6 April 2022
• Sequence stratigraphy: hierarchy of sequences
  ! Sequence order || Cycle frequency, m.y. || Thickness, m || Stratigraphic name
  3 KB (380 words) - 22:25, 3 February 2022
• Depositional sequence identification
  ...f><ref name=ch04r70>Mitchum, R. M., Jr., and J. C. Van Wagoner, 1990, High-frequency sequences and eustatic cycles in the Gulf of Mexico basin: Proceedings, Gul
  3 KB (409 words) - 21:47, 22 February 2022
• Sea level cycle order
  ...al.<ref name=ch04r70>Mitchum, R., M., Jr., Van Wagoner, J., C., 1990, High-frequency sequences and eustatic cycles in the Gulf of Mexico basin: Proceedings, Gul The seven fourth-order cycles occur at approximately the same frequency as the oxygen isotope warm and cold cycles. The oxygen isotope cycles are i
  7 KB (982 words) - 21:20, 23 February 2022
• Cross-well electromagnetic tomography monitoring of fluid distribution
  ...n the MHz, can only give information near the borehole. Therefore, a lower frequency system is used due to its high wavelength, which ultimately results in a hi | ω || Frequency || Radians/second || s^-1
  18 KB (2,715 words) - 18:29, 8 February 2024
• Magnetotellurics
  | Depth of investigation is a function of both frequency at which the measurement is taken and the average resistivity of the subsur
  3 KB (486 words) - 17:53, 25 January 2022
• Seismic data acquisition on land
  ...be placed below weathering layer. || Requires expensive shothole drilling. Frequency dependent on material in which explosion occurs. Dangerous to handle. ...mal cultural and environmental impact. Controlled frequency source. Narrow frequency band can increase signal to noise ratio. No shot holes required. || Shallow
  10 KB (1,389 words) - 16:20, 20 January 2022
• Amplitude (seismic)
  ...f wave are porosity, density, temperature, [[grain size]], gas saturation, frequency, external pressure, pore pressure and stress. The curve between P wave velo ...cpubs/seismic1/data/a165/a165/0001/0300/0301.htm Application of Amplitude, Frequency, and Other Attributes to Stratigraphic and Hydrocarbon Determination], in S
  8 KB (1,291 words) - 15:49, 18 January 2017
• Seismic processing basics
  ...so as to satisfy the individual tastes of the interpreter. Such things as frequency content, gain, trace spacing, and type of display are all up for grabs (see ...st. Antialias filters remove frequencies above the sampling limit (Nyquist frequency) of the new sampling time. The operation is performed before the sampling i
  19 KB (2,895 words) - 20:23, 21 January 2022
• Molyneux:sandbox
  * [[Frequency]] This is on the [[Seismic attributes]] page
  5 KB (543 words) - 23:45, 8 January 2015
• Full waveform acoustic logging
  ...ng tools. The main differences are that (1) the source is usually of lower frequency, centered at 5 to 10 kHz rather than at 20 kHZ; (2) the source-receiver spa ...s, v. 48. p. 1631–1644, DOI: 10.1190/1.1441444.</ref> Because of the lower frequency content, this method is not as accurate as that used with conventional soni
  10 KB (1,530 words) - 20:47, 19 January 2022
• Marine seismic data acquisition
  ...completely eliminated (notched) by ghosting are the even multiples of the frequency just calculated. The notch frequencies caused by a detector or source at [[
  13 KB (2,015 words) - 18:24, 21 January 2022
• Techniques for enhancing seismic facies analysis
  ...pinch-outs, and other features is greatly enhanced. Amplitude, phase, and frequency can be mapped aerially in considerable detail, resulting in striking visual
  5 KB (720 words) - 18:51, 4 February 2022

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