Changes in Amplitude Indicate Fluid Gas Sand Water Sand Inline 840 Slide 34 You will be looking at the magnitude of the trough – its largest negative amplitude The blow-up on the left shows extremely negative numbers where the trough is vertical, it has been clipped for display purposes Compare this response to the blow-up on the right On the right, where water is the pore fluid, the response is weaker (less negative numbers) Traces are ‘clipped’ Figure 1 Courtesy of ExxonMobil L12 – Data Analysis