Geophysical Surveys Flashcards
1
Q
What are the three main geophysical methods?
A
- Seismic reflection
- Gravity
- Magnetic
2
Q
What is acoustic impedance - Z?
A
The product of the acoustic velocity (v) in the rock and the density of the rock (p)
3
Q
What is the seismic reflection coefficient defined by?
A
R = ( p2v2 - p1v1 ) / ( p2v2 + p1v1 )
4
Q
What is a common depth point? ( or common mid point )
A
Common reflecting point at depth on a reflector or the halfway point when a wave travels from a source via a reflector to a receiver
5
Q
What is two way time ? (TWT)
A
TWT indicates the time required for the seismic wave to travel from a source to some point below the surface and back up to the receiver
