Page 198 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

m/s
4000
=
Vp
m/s
*
2500
=
V,
gen-
upper
Profiles 181 Bibliography Selected and draw: below, calculate model two-dimensional the For 6-3 for several source/receiver positions reflectors) both (to Normal incidence raypaths a) surface. the on between unmigrated time section. of an appearance general The b) migrated time section. of a common appearance general The c) to ray- trace m 1000 the dipping 7 Surface W 0001 1 Reflector W000!
the
the
draw
Reflection velocities seismi iti several for A normal incidence raypath follows easiest it is the lower interface to into refracts and i caiman several vi in plot as m Ww oo0L i woooL
1000 m
Seismic seismic with reflectors) the ray compute of a migrated time section. | Ww OO0t W 000Z etl to model. the the same deeper. m 1000 m/s
Of structure, both (Hint: lower reflector, how then time, 6-1 (Refl i interfaces, 's from exactly 4000 =
Interpretation i (to surface. For the vertical line from calculate Then travel time section. appearance m/s m/s structu re th bo ‘or fi which results on reflector 3000 each m/s of Vz 6-2
Tectonic two-di imensional v raypaths the on upward as downward. drawing a reflector. Law). two-way to unmigrated the general 4000 2500 Modal for Exercise synformal of a -raypaths yp time section with 2500 = for Exercise

a incidence scale migrated time section, overlain (c), but V,
And shows Positions Start by upper vertical of an draw the migrated depth section. = V, = Vp model (Reflector 2): incid lence and Sem tay, Se “ Model
Structural below normal upward. the of according to Snell’s the appearance and Surface uw 000d 1 000k _ following norma Ll the unmigrated (a), (b) 1

model ’ eee Sketch an the same path paths segment layer, Change eral Compute Draw the t interface D Taw Draw Draw the Repeat Surface Reflector Het Reflector 2

Chapter 6 EXERCISES The 6-1 a) b) c) d) Given 6-2 zontal ) a b) c) d)

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