About the Course
Vertical incidence seismology
Seismic geophysics starts here, with the simplest, most fundamental model. We explore the propagation of a vertically traveling plane wave through layers of different rocks, and discover where reflections arise, and how to calculate their strength.
Convolutions and synthetic seismic
How do we build simple models of the subsurface so that we can understand?
1. We create impedance logs from sonic and density logs
2. We can then create a Reflection Coefficient log
3. Using convolution we can then create a synthetic seismic trace
The limitations and pitfalls will be discussed, and lead to later Knowledgettes on Rock Physics, Absorption, and AvO
Wavelets and Polarity
The three most common wavelet pitfalls are introduced in this lecture.
Ray theory and practice
At a large scale, we can use our Freshman physics ray theory to model how our seismic waves propagate, gaining some real insights. Snell's law applies here, telling us how rays curve and bend. We can get rays focussing to a small area, or diverging and forming shadow zones. Ray theory also helps us to understand migration and to develop a workable strategy for the very special case of interpreting grids of 2D lines.