Seismic Reflections Lecture 6 - + Shot Receiver Seismic Record Layer 1 Layer 2 Layer 3 Layer 4 Impedance = Velocity * Density Seismic Record - Trough + Peak Layer 1 Impedance Increase Layer 2 Travel Time (2 way) in msec SLIDE 1 This unit goes into some more detail on what causes a seismic reflection and the characteristics of the seismic response In other words, what do the “peaks” and “troughs” on a seismic section mean No need to explain this figure – will be covered in the lecture Layer 2 Impedance Decrease Layer 3 Layer 3 Impedance Increase Layer 4 Peak over Trough is an Increase in Impedance Courtesy of ExxonMobil L 6 – Seismic Reflections