Ch. 4] SUGGESTED PROGRAM OF ATTACK 85 



advantage of every scientific fact_ related to the occurrence and pro- 

 duction of oil and gas, with the consequence that scientific aids to 

 oil production have been developed to a high degree, a degree that is 

 rare in all American industry. The wisdom of this policy is found in 

 the excellent returns of producing divisions. 



Properties measured in the course of petroleum production follow: 



(a) Electrical conductivity of reservoir (j) Acoustic impedance, 

 rocks and their contained fluids. (k) Density. 



(b) Electrical self-potential. (I) Magnetic susceptibility. 



(c) Spectrograph^ analysis of reservoir (to) Colorimetric determinations, 

 rocks and contained fluids. (n) Porosity. 



(d) Radioactivity of rocks and fluids. (o) Permeability. 



(e) Induced radioactivity of rocks and (p) Fluid saturation. 



fluids. (q) Composition of connate fluids, in- 



(/) Fluorescence of reservoir fluids. eluding pH. 



(g) Mineralogical composition. (r) Temperature distribution. 



(h) Insoluble residues of sedimentary (s) Seismic wave velocity, 

 rocks. 



(i) Clay mineral content and identifica- 

 tion of species. 



These measurements of conditions of sedimentation suggest the large 

 number of possibilities which have not been developed in geophysical 

 applications to problems outside the petroleum industry. 



MILITARY AND NAVAL PROBLEMS 



The application of geophysics to these problems involves many sub- 

 jects which are classified for military security. Some of the published 

 articles on the subject show possibilities of use in other areas which ap- 

 proach those of the petroleum applications in number. It is promis- 

 ing to observe that under the stimulus of military necessity many 

 established geophysical techniques have developed new values in a 

 different setting. Some of the spectacular performances of World 

 War II involved highly coordinated programs in the geophysical 

 sciences. If it had not been for combat teams in oceanography, mete- 

 orology, and military geology, many of our task forces would have 

 suffered severely at the hands of the enemy. 



SUGGESTED PROGRAM OF ATTACK 



For the sedimentologist who wishes to employ geophysics as an aid 

 to a solution of his problems, it is recommended that the principles 



