SEISMIC METHODS 



735 



I 



The radius of curvature of the reflected wave when it arrives back at the 



origin is p, where p = — + p^ 



or 



P — 



1 + f 



(90) 



The effect of curvature of the reflecting surface amounts to changing the 

 curvature of the arriving wave front according to this equation. Because 

 the effect of the p term on computation equations is small, the change 

 due to curvature of the reflecting horizon will, in general, be even smaller, 

 provided that the spread is not excessive and that the condition of multi- 

 ple reflections does not obtain. 



Variations in Dip Shooting. — Dip shooting is flexible and permits 

 of a multitude of variations depending upon geologic section, operating 

 conditions, and economic considerations. 



An excellent reference in which several standard reflection computing 

 techniques are applied to steep-dip seismic data has been prepared by Rice.f 

 The velocity was assumed to be a parabolic function of depth. A study is 

 made of the overall effect of applying these methods to the computation of 

 a specific steep-dip asymmetric structural profile. 



T^J^ 9^ \'^-\ ^'^h "^ ?i?,'^i'^^'°" °^ Steep-dip Seismic Computing Methods," Geophysics, Vol. XIV, 

 J.NO. i, April, 1949, pp. 109-122. r ^ , , 



