The only requirement is three elevation points in the form of a triangle on the 

 fault plane. 



In the drawing, well 5 is on the 3500-foot contour of the fault plane, and 

 the datum elevation is 4150 feet. Therefore, the fault will be encountered 

 650 feet below the datum at this location. 



In Figure 24-11, A shows an anticline cut by a high-angle reverse fault. 

 The productive area on the upthrown block is ruled. The seven wells that drilled 



Figure 24-10. Structural contour map showing a datum (fault) gap and the contoured 

 fault plane. 



462 



