Communications: electrical – Selective – Having electron beam device
Patent
1976-10-27
1978-08-29
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340 155DP, 364421, G01V 128
Patent
active
041107292
ABSTRACT:
A reflection seismic exploration system is disclosed which effectively reduces the influence of near surface irregularities, without actually knowing or measuring these irregularities, and accurately determines the velocity of a seismic signal between two reflectors, the normal travel time in the layer between the reflectors, and the thickness of the layer. Two consecutive shots, spaced apart along the surface, are fired into the same spread of detectors. Three different time-distance relationships are recorded: (a) the relative arrival times of the reflections from each of the two reflectors at each of an array of detectors for one of the shots, and the shot-detector distances along the surface; (b) the difference between the relative arrival times of the reflections of the two shots from the shallower reflector at each detector and the distances between each detector and the midpoint between the shots; and (c) the difference between the relative arrival times of the reflections of the two shots from the deeper reflector at each detector and the distances between each detector and the midpoint between the shots.
The first, second and third time-distance relationship are curve-fitted to defined expressions to find the values of selected coefficients of these expressions. These coefficient values are combined to find the normal interval time and the interval velocity in the layer between the two reflectors, which are indicative of the nature of the layer, and to find the thickness of the layer.
REFERENCES:
patent: 3280936 (1966-10-01), Mayne
patent: 3611278 (1971-10-01), Guinzy
patent: 3794827 (1974-02-01), Widess
"Velocity Spectra-Digital Computer Derivation . . . . Velocity Functions", Taner et al., Geophysics, vol. 34, No. 6, Dec. 1969, pp. 859-881.
"Velocity Determination by Means of Reflection Profiles", Green, Geophysics, vol. 3, Oct. 1938, pp. 295-305.
Birmiel Howard A.
Gillespie Ronald G.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
LandOfFree
Reflection seismic exploration: determining interval velocity in does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reflection seismic exploration: determining interval velocity in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reflection seismic exploration: determining interval velocity in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1636225