4. Reservoir horizons. Number, age, relative importance, character, thickness, 

 continuity, porosity, permeability, kinds of cement, thickness, and degree of 

 saturation of each and amount and character of occluded water present. 



5. Water horizons. 



6. Reservoir pressures. 



7. Composition of edge water. 



8. Possible sources of oil and gas and probable time or times of accumulation. 



9. Possibility of extending producing areas or discovering new producing horizons. 

 Indicate most promising areas and ages of prospective horizons. 



VII. Description of several typical pools, illustrating each important mode of occurrence 



1. Location, date of discovery, exploration methods employed, etc. 



2. Geography and physiography. 



3. Surface and subsurface geology. Contour maps and cross sections. 



4. Type of trap. 



5. Producing horizons. Character, extent, and depths of each. 



6. Grade of oil. 



7. Methods of drilling. 



8. Depth of drilling. 



9. Completion and production techniques. 



10. Water drive, gas-cap drive, or dissolved-gas drive. 



11. Secondary-recovery operations. 



12. Conservation practices. 



13. Ultimate recovery per acre anticipated for each horizon. 



VIII. Production statistics and reserves, using latest data available 

 IX. Bibliography 



DOCUMENTATION Documentation is systematic citation of source 



material that gives a report authority, credits 

 properly the work of others, and guides those readers who wish to pursue a 

 subject further. Many systems of documentation are in use, any one of which 

 may be satisfactory if it is used consistently and if the reader can use it 

 efficiently. 



A common form of documentation for reports in the field of the earth 

 sciences is that recommended in a pamphlet by the United States Geological 

 Survey to its staff members. This form, which is used in this book, is relatively 

 simple and easy for both the writer and the reader to use. It is also relatively 

 inexpensive to use for both the typist and the printer because there is no need 

 for time-consuming care either in getting footnote references at the bottom of 

 the proper page or in making multiple entries in the bibliography. 



This bibliographic form seems to be gaining favor. According to the 

 pamphlet referred to above, this form has ". . . been adopted by the editors of the 

 American Journal of Science, Journal of Geology, Journal of Paleontology, 

 Bulletin of the Geological Society of America, and U. S. Geological Survey." 



788 



