adapted to detailed subsurface studies of localized areas where well control is 

 abundant. The principal objection to peg models is that they are bulky, occupy 

 much floor space, and cannot be moved readily. 



Figure 24-46 shows a peg model of a simple dome. The base into which 

 the pegs are inserted should be made of wood not less than 1 inch thick. This 

 base is painted, usually white or buff, and section and township lines and other 

 desirable surface-map features are drawn on it to the scale selected for the 

 model. At the location of each well, a 14 -inch hole is drilled almost but not 

 entirely through the base. Ordinarily, a 14 -inch iron rod is used for the pegs, 

 which, in turn, are to represent the wells. 



The plane of the board is the elevation datum for the model. This assumed 

 elevation should be somewhat below that of the lowest bottom-hole elevation in 

 the field. Thus, if the lowest bottom-hole elevation is 2300 feet above sea level, 

 then the model might be constructed with the base elevation at 2000 feet. 



\ \ \ 



„\__j2icJk_ 



^p:''r'%s ;■;■;' 



Figure 24-45. Palinspastic map showing thicknesses restored by means 

 lithofacies and isopach maps. 



505 



