AGM 2
lecture 1
lecture 1
Set of flashcards Details
| Flashcards | 16 |
|---|---|
| Language | English |
| Category | Nature Studies |
| Level | University |
| Created / Updated | 08.01.2013 / 09.01.2013 |
| Weblink |
https://card2brain.ch/box/agm_2
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using multi offset data permits
velocity analysis
horizontal stacking
(multi offset=multiple recievers)
CMP
common midpoint
NMO
Normal move out
The procedure that compensates for the effects of the separation between seismic sources and receivers
order of processing
(3 things)
each CMP in NMO corrected an stacked
seismic source characteristics
repeatability
minimum phase (1st peak dominant)
inexpensive
environmental
dynomite source pros
perfect source
high energy
low ground roll when buried
gets past weathered layer
dynomite source cons
expensive
ghosts from burial
explosive hazard
advantage of an up sweep chirp
gives better coupling
typical array length
and why
20m, wavelength of ground roll
problem with airgun
surface ghost, interferance
sideswipe
out of plane energy
MAZ
multi azimuth surveying
SNR
signal to noise ratio
guidline signal to noise ratio improvement
6 times
what does before stack deconvolution achieve?
removes short path multiples
what does after stack deconvolution achieve?
removes long path multiples
