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 13 - Seismic Attributes