Changes

==3-D advantages==

==3-D advantages==

What is the attraction of 3-D? Why do you want a 3-D survey rather than a (less expensive) grid of 2-D seismic lines? A 3-D seismic survey has many advantages over a 2-D line or a grid of 2-D lines—even a dense one. (A2-D grid is considered dense if the line spacing is less than about 1/4 mile [1,320 ft; 400 m].) The advantages of 3-D include the following:

What is the attraction of 3-D? Why do you want a 3-D survey rather than a (less expensive) grid of 2-D seismic lines? A 3-D seismic survey has many advantages over a 2-D line or a grid of 2-D lines—even a dense one. (A 2-D grid is considered dense if the line spacing is less than about 1/4 mile [1,320 ft; 400 m].) The advantages of 3-D include the following:

* True structural [[dip]] (2-D may give apparent dip)

* True structural [[dip]] (2-D may give apparent dip)

* More and better stratigraphic information

* More and better stratigraphic information

* Map view of [[Reservoir quality|reservoir properties]]

* Map view of [[Reservoir quality|reservoir properties]]

* Much better areal mapping of fault patterns and connections and delineation of reservoir blocks

* Much better areal mapping of [[fault]] patterns and connections and delineation of [[reservoir]] blocks

* Better lateral resolution (2-D suffers from a cross-line smearing, or [[Fresnel zone]], problem)

* Better lateral resolution (2-D suffers from a [[cross-line]] smearing, or [[Fresnel zone]], problem)

==Data sets==

==Data sets==