962 



EXPLORATION GEOPHYSICS 



circulated is distinguished from a new 

 oil fluoresces more brightly than that 



DRILLING RATE 

 FEET PER HOUR 



LOGGING UNITS 

 OCim* OIL GAS- 



Fig. 592. — Mud analysis log of a West Texas 

 discovery well. The well was completed in the 

 deeper of the two oil zones logged. (Souther, 

 Geophysics.) 



show by virtue of the fact that new 



which has been circulated. 



In determining the gas con- 

 tent, a portion of the returning 

 mud is first passed through a trap 

 where the gas is removed. Air, 

 which is constantly drawn through 

 the trap by means of a motor- 

 drawn vacuum pump, then carries 

 the gas through a flexible hose to 

 the analyzer, where it passes in 

 turn through a filter, a humidifier, 

 a flow meter, and a ''hot wire" gas 

 detector. 



The results of the oil and gas 

 analyses are correlated with depth 

 by means of a special instrument 

 which indicates the depth of the 

 bit at all times. All of the infor- 

 mation is assembled in the form 

 of a log which shows curves for 

 rate of penetration, oil content 

 and gas content. 



Figure 592 illustrates the ap- 

 plication of mud analysis logging 

 in West Texas, as used to supple- 

 ment the electrical logs. 



GEOCHEMICAL METHODS 

 UNITED STATES PATENTS 



1,843,878 Issued Feb. 2, 1932. Gunther Laubmeyer. "Method of and Apparatus for 

 Detecting the Presence of Profitable Deposits in the Earth." 



2,103,187 Issued Dec. 21, 1937. August Gustav and Adolf Schroter. "Method for 

 Detecting Small Quantities of Gas." 



2,112,845 Issued April 5, 1938. Lynn G. Howell. "Apparatus for Locating Hydro- 

 carbon Deposits in the Earth." 



2,141,261 Issued Dec. 27, 1938. Joseph Baldwin Clark. "Method and Apparatus for 

 Collecting Soil Gas Samples." 



2,158,980 Issued May 16, 1939. Nils Brundin. "Method of Locating Metals and 

 Minerals in the Ground." 



2,165,214 Issued July 11, 1939. Ludwig W. Blau and William B. Lewis. "Geophysical 

 Prospecting with Short Electromagnetic Waves." 



2,165,440 Issued July 11, 1939. George S. Bays. "Gas Mapping." 



2,170,435 Issued Aug. 22, 1939. William J. Sweeney. "Gas Analysis Apparatus." 



2,174,349 Issued Sept. 26, 1939. John B. Littlefield. "Gas Analysis." 



2,177,139 Issued Oct. 24, 1939. Leo Horvitz. "Gas Separation." 



2,183,964 Issued Dec. 19, 1939. Leo Horvitz. "Method of Exploration for Buried 

 Deposits." 



2,192,525 Issued March 5, 1940. Esme E. Rosaire and Leo Horvitz. "Geophysical 

 Prospecting Method." 



