1. There is a linear relationship between the apparent (measured) two-way time thickness of a bed and its actual two-way time thickness when the bed thickness is more than tuning thickness, which in this model is 16 ms. This relationship is shown by the quasi-linear, heavier dashed line that slopes up to the right from a thickness value of 16 ms. In this thickness range above one-half the dominant wavelength (in two-way time), a bed is said to be time resolved, and its actual thickness can be determined from its apparent (measured) two-way time thickness.

2. There is a quasi-linear relationship between the peak-to-trough amplitude curve and the actual bed thickness when the two-way bed thickness is less than tuning thickness. Beds in this thickness range exhibit the same apparent (measured) time thickness, regardless of their actual thickness. This effect is shown by the flat, horizontal portion of the measured time-thickness curve. If reflection events from such beds can be seen in seismic data, the beds are said to be detected not resolved, and their actual thicknesses must be estimated from the linear relationship between the actual bed thickness and the peak-to-trough amplitude of the reflection composite.

Figure 5.