Vrms & Vnmo
11
1 Multiple Layers: Green’s Method Multiple Layers: Dix Equation Dix Equation: Velocities
description
Vrms and Vnmo
Transcript of Vrms & Vnmo
1
Multiple Layers: Green’s Method
Multiple Layers: Dix Equation
Dix Equation: Velocities
2
Multiple Layers: Dix Equation
Example
3
Determine Thickness
More Dix Method
More Dix MethodMore Dix Method
4
30 m array
60 m array
120 m array
5
Errors in Green & Dix Solutions
30 and 60 m Spreads
Errors at larger X valuesfor deeper interfaces
120 m SpreadMore weight on valuesat smaller values of X
6
Field Seismogram
X2-t2 plot of field seismogram
Dipping Layer: Travel-time Eqn.
7
Split Spread Array –Asymmetric
Horizontal versus Dipping
Dip, Thickness, Velocity
8
Dip, Thickness, Velocity
Dip, Thickness, Velocity
Dip, Thickness, Velocity
9
Plot of Table 4.6 Data
Return to NMO
Return to NMO
10
Return to NMO
NMO Approx: 30-240 m Spread
Dip Normal Moveout (DMO)
11
DMO
DMO
