Uploaded by pritydss075

Seismic data provide a

Seismic data provide a “time picture” of subsurface structure. For accurate structural analysis, an effort should
be made to convert the time data to depth.
There are three types of seismic data:
Reflection (including 2-D and 3-D)
Shear wave
2-D reflection seismic data provide cross-sectional views in both the dip and strike directions. Data on the
lines are a mixture of both in-plane and out-of-plane reflectors. 2-D reflection seismic data are most important
in the earlier stages of an exploration program, especially in frontier basins.
3-D reflection seismic data provide resolved cross-sectional views along any azimuth within the survey area.
Time “slices” (maps) on any horizon can also be generated. The nature and location of out-of-plane features
can be more accurately determined. Because of the high acquisition costs, 3-D seismic techniques normally
are used only to more accurately define individual prospects.
Shear wave data, in combination with conventional compressional wave data, can provide information on
lithology, fractures, and the presence of hydrocarbons.
Refraction seismic data provide a deep crustal view of gross structure (basin scale to lithosphereupper mantle scale), which is useful when trying to understand regional tectonics.
How to use it