MAGNETIC RESURVEY OF OKLAHOMA 
CITY FIELD! 
O. C. CLIFFORD, JR? 
Enid, Oklahoma 
ABSTRACT 
Comparative results of two magnetometer surveys, one in December, 1927, before 
the discovery of oil, and one in January, 1932, after production had reached maturity, 
show that the vertical component of the earth’s magnetic field has been changed in de- 
tail by the presence of production equipment. The generalized magnetic pattern 
remains similar, however, for both surveys. 
The first problem outlined at the initiation of an exploratory pro- 
gram of earth magnetics 5 or 6 years ago was, almost without excep- 
tion, the definition of the vertical component pattern across well 
known and highly developed producing structures. The results of 
such surveys did not, in general, fit into the preconceived pattern as 
anticipated by the geologist-geophysicist. There were, however, such 
noteworthy exceptions as the buried extension of the Wichita Moun- 
tains in the Texas Panhandle and the southern portion of the Granite 
ridge in the vicinity of Eldorado, Kansas. With the knowledge that 
the magnetic pattern over these types of structure was so readily 
reconciled with the configuration of the granite, attempts were made 
at reconciling the known geological features in other areas with the 
measured magnetic anomaly, but these attempts proved, too fre- 
quently, unsuccessful. The geologist-geophysicist faced with -the 
necessity for an explanation of phenomena with which he was little 
acquainted, but concerning which he had definite convictions, ex- 
pounded such hypotheses as the hysteresis induced by buried casing, 
the possibility of polar reversibility under the impact of cable tools, 
et cetera ad infinitum, being limited only by an inadequate vocabulary. 
1 Read before the Association at the Oklahoma City meeting, March 25, 1932. 
2 Geologist-geophysicist. 
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