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  • ...er knows when a research fact, outcrop observation, operational statement, well-log analysis, environment-of-deposition analysis or seismic section being s ...stop as fast as it starts. The professional, besides being scientifically well trained, needs to maintain a positive attitude and be adaptable in communic
    31 KB (5,164 words) - 13:55, 17 October 2016
  • ...he three primary processes. Deconvolution assumes a stationary, vertically incident, minimum-phase source wavelet and white reflectivity series that is free of * [[Quality control in processing]]
    6 KB (789 words) - 14:10, 17 September 2014
  • ...changes also can affect interval velocities within a rock layer. Note that well-log measurements have a limited accuracy; therefore, some of the high-frequ Well-log measurements of velocity and density provide a link between seismic dat
    247 KB (37,353 words) - 10:59, 30 July 2014
  • ...gically plausable velocity-depth models. Of course, if there is ample well control, we may be able to discard all but one of the few solutions and declare tha ...e. One set of constraints is the depth information at well locations. This well-top information can be used to calibrate results of inversion of surface se
    278 KB (43,816 words) - 14:40, 10 September 2014
  • ...th-model, and assign a velocity of 5400 m/s to the subsalt region based on well data to construct a final velocity-depth model (Figure 10.1-9). ...ve the same patterns as in the true subsurface situation. [[Calibration to well tops]] is also part of the model validation procedure ([[model building]]).
    190 KB (29,309 words) - 14:41, 10 September 2014
  • ...structural and stratigraphic inversion of seismic data with calibration to well data. ...elevant to seismic data are sonic, shear, and density. Another category of well data is a vertical seismic profile (VSP) ([[vertical seismic profiling]]).
    395 KB (60,721 words) - 14:42, 10 September 2014
  • ...'0'') arrives at ''t''<sub>0</sub> = 2''z''<sub>0</sub>/''v''. Now let the incident [[Dictionary:Wavefront|wavefront]] advance in depth by the amount ''λ''/4. ...er, 1953, Ricker, N., 1953, Wavelet contraction, wavelet expansion and the control of seismic resolution: Geophysics, 18, 769–792.</ref>. A short distance t
    15 KB (2,198 words) - 16:36, 6 October 2014
  • ...ion coefficient is defined as the ratio of the reflection amplitude to the incident wave amplitude. In terms of acoustic impedance ''I'' = ''ρα'', where ''ρ ...earby sonic logs. In many practical situations, there is insufficient well control and the bands of the low- and high-frequency information derived from the s
    6 KB (796 words) - 08:04, 7 October 2014
  • ...elative amplitude preserved” section plotted at reduced gain, and with a well log inserted. What conclusions can be drawn from Figure 10.1a that are less ...ft on an SP log (see Telford et al., 1990, chapter 11 for a description of well logs) often indicate sand; a gamma-ray log often appears much the same. Son
    78 KB (11,396 words) - 09:12, 21 June 2018
  • ...b|{{figure number|10.9b.}} Map of unmigrated seismic data showing lines of control by diagonal dashes (courtesy of Prakla-Seismos).]] Because source and geophone are coincident, reflection raypaths are incident on the beds at right angles; such raypaths are shown by short dashes on Fig
    7 KB (939 words) - 13:34, 30 July 2019
  • ...n, in Second International Mining Technology Symposium: Groundwater Hazard Control/Coal Bed Methane Development and Application Techniques, Xian, China (Octob In a [[C-wave]] survey, the P-wave incident upon a reflecting boundary excites a reflected shear wave, with an inline p
    8 KB (1,187 words) - 23:51, 22 September 2020