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Assistant Geophysicist Solutions

 96. The foldage of a 2D common depth point (CDP) reflection profiling conducted using a 72-channel digital recording unit with a geophone interval of 50 m and shot interval of 100 m is

a) 18          b) 36          c) 72          d) 144

(Thanks to Pragnath, AU)

Solution:

Foldage:- A measure of the redundancy of common midpoint per bin in seismic data.

Foldage=\frac{1}{2}*[Total~receivers~*\frac{Receiver~interval}{Shot~interval}]

 

Given that Total~receivers= 72   Receiver~interval= 50 m

Shot~interval= 100 m.

 

Foldage=\frac{1}{2}[72~*\frac{50}{100}]

 

Foldage=\frac{1}{2}[72~*\frac{1}{2}]

 

Foldage=\frac{1}{2}[36]

 

Foldage=18

 

Therefore, the answer is (a) 18

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