USE OF EXISTING WELLS IN SEISMOGRAPH WORK 1413 
SHOT WELL 
WN GARR -W[WU7]_{_T-,-U RK i={Z_”WWElJIIMCIJ@RO0O(UQJRCRF>"D HAS 
esc eres ae gel ea ee = 


o7 
Fic. 3.—Sectional diagram showing use of well for profiling mushroomed flank 
of salt dome. Patent applied for. 
If mushrooming is found to exist, the position of the flank of the 
dome, relative to the well, can be determined with considerable accuracy 
to a depth almost as great as that of the well. 
Because of the very many deep or moderately deep wells around salt 
domes in the Gulf Coast region, many of which are, or could be made, 
available for work of this kind, this method may have extensive applica- 
tion. Any well open to the desired depth could be used and no injury 
to producing wells would result. 
A further application of this method consists in the determination of 
the position of a fault plane at different depths, as shown in Figure 4. 
Here, for example, a well which was drilled too far back from the fault 
plane to obtain oil is used in determining the position of the fault plane 
for the purpose of making a second location. 
GENERAL PROBLEM OF DETECTION OF MUSHROOMING 
Use of the method discussed for profiling down the sides of salt domes 
determines not only the existence of mushrooming, should this exist, but 
123 
