THERMAL CONDUCTIVITIES OF ROCKS 277 



cannot be denied. The real problem, therefore, is the location of these 

 surfaces in their undisturbed condition. Barring the perturbations produced 

 by flowing fluids previously discussed, there remains the instrumental 

 errors of observation.' 



The errors in depth to the isothermal surface resulting from instrumental 

 errors are estimated. 



Results of Deep Well Temperature Measurements in Texas. 



By E. M. Hawtof. 

 American Petroleum Institute, Bulletin 205, October 1930, pp. 62-108. 



This paper presents a summary of the work of the writer carried out 

 between the dates March, 1927, to January 1, 1929. During this period 

 temperature measurements in deep wells were made in each of the oil 

 yielding provinces of Texas, including the Gulf Coast salt dome province, 

 the interior salt dome province of East Texas, the Luling-Mexia-Powell 

 fault zone province, the Bend Arch, the Panhandle, the Permian Basin of 

 West Texas and South- West Texas. 



A general picture of the geothermal conditions has been secured, which 

 should not only justify certain preliminary conclusions, but should also 

 permit effective planning and conduct of further and more detailed work in 

 selected areas. 



Equipment. — The apparatus used in making temperature surveys was 

 modelled on that described by Van Orstrand. Photographs of the apparatus 

 are given. 



Stem correction for maximum thermometer. — All tests were corrected using 

 the stem correction given by the U.S. Bureau of Standards. This correction 

 may amount to as much as i° F. in deep tests, although it is commonly 

 much less. 



Difficulty in securing suitable wells owing to their usually unsettled condi- 

 tions is noticed. 



Geological conditions dealt with. — The wells in which temperatures were 

 taken ranged in depth from less than 1,000 to more than 8,000 ft. ; thus a 

 wide range of different structural types was covered by the work. Some 

 idea of the regional structural conditions is given in a map of Texas showing 

 by structural contours the writer's interpretation of the structural conditions, 

 the location of wells that yielded results of particular interest, and the 

 number of feet of depth which, in each of the wells indicated, resulted in an 

 increase in temperature of 1° F. 



A series of maps, cross sections and depth-temperature curves illustrate 

 the article. 



Original field notes and temperature tests carried out during this work, 

 showing the country, field, company, well, name and number are given in 

 an appendix. 



Geothermal Conditions in Oil-Producing Areas of California. 



By Anders J. Carlson. 



American Petroleum Institute, Bulletin 205, October 1930, pp. 109-139. 



This report is a summary of work done in the Santa Fe Springs and 

 Long Beach fields of the Los Angeles Basin. The results are particularly 

 significant only in respect to relations between earth temperatures and local 

 anticlinal structure of the Santa Fe Springs and Long Beach types. 



