1. The Convolution Method
Reflection
Coefficients
Lithology
Velocity
Density
Impedance
Wavelet
Model = x  *
Shale
Sand
Slide 8
This slide shows the basic steps in modeling the seismic response
We multiply the velocity and the density to get the impedance
Next we calculate the reflection coefficient at each significant rock boundary
an increase in impedance across a boundary gives a positive RC
a decrease in impedance across a boundary gives a negative RC
We extract or assume the pulse shape or wavelet
Each RC is convolved with the wavelet
The responses for each individual RC are summed to get a modeled trace
Courtesy of ExxonMobil
L Seismic Attributes