1. Discussion of problems & Common midpoint gathers
Environmental and Exploration Geophysics II
Discussion of problems &
Common midpoint gathers
tom.h.wilson
Department of Geology and Geography
West Virginia University
Morgantown, WV
Tom Wilson, Department of Geology and Geography

2. Tom Wilson, Department of Geology and Geography

3. Tom Wilson, Department of Geology and Geography

4. Tom Wilson, Department of Geology and Geography

5. Tom Wilson, Department of Geology and Geography

6. Tom Wilson, Department of Geology and Geography

7. Tom Wilson, Department of Geology and Geography

8. The effect of the moveout correction on the traces in the common midpoint (CMP) gather is to create a composite normal incidence trace that effectively shares a coincident source and receiver at the midpoint shared by all the traces in the gather. We’ll discuss CMP data in more detail in a couple lectures.
Tom Wilson, Department of Geology and Geography

9. Homework
Construct a stacking chart for a symmetrical split spread consisting of 12 geophones arranged 6 on each side of the source (see handout).
Bring questions to class next Monday. Chart is due this Wednesday.
Complete your reading of Chapter 4. Dipping layer reflection events are covered on pages , with additional discussion on pages The idea of common depth point sorting is discussed on pages We’ve talked tangentially about resolution ( ) and velocity analysis ( ). We will be talking about stacking of CDP gathers ( ) and migration ( ). Discussions of migration will come later but it is helpful to be aware of the issues early on.
We have to lay some more groundwork before tackling problems in Chapter 4, but continue your reading and give some thought to the following problems. We will try to wrap up background discussions on these problems next week. Consider problems 4.1, 4.4 and 4.8.
Tom Wilson, Department of Geology and Geography

10. Continue working on Parts 3 and 4 of Gulf Coast Seismic Interpretation Exercises
Tom Wilson, Department of Geology and Geography