256 I. I. Krolenko 



reconnaissance surveys of the area to the sovith of Makhach-Kala the strike 

 of the investigated rocks was shown to be uncomphcated by the presence 

 of any new upfolds (Fig. 7). 



Well drilling, using the results of the loop method, showed the petroleum 

 deposits of the Makhach-Kakhachkalinskian brachy-anticline and the 

 deposit was exploited. 



Between 1941 and 1943 the loop method was used to map the structures 

 on the upper levels of the section in the western Turkmenia. 



In the investigated area, the geological structure of which has not been 

 established by the previously conducted gravimetric survey, geological 

 mapping and Krelius drilling, the Bolshaia Tuzluchaiskaia brachy-anticline, 

 complicated by secondary upfolds, was shown by the loop method first 

 in trials (^^) and then in production <^^) work. The results of the observations 

 showed the reason for the lack of success in the preceeding Krelius drilling, 

 determined the further course of investigation and confirmed the possibility 

 of the successful use of the loop method to study structures in the western 

 Turkmenia. 



Work by the loop method in the western Turkmenia was recommenced 

 in 1952-1955. The survey led to a detailed study of the structure of the 

 Kobek fold, the position of the northern limb being detected as well as the 

 periclinal closures of the structure. On the basis of the studies, further 

 course of development was recommended. By this work, and also by the 

 results of the loop survey of the Chelekenskaia structure, the tracing 

 of faults with the aid of electrical profiling C^' ^) was shown to be possible. 

 The same was found at a number of structures of the Kerch peninsula. 



In 1954-1955 experimental work was carried ;ut in Western Siberia. 

 The observations were made within the limits of the Chelyabinskii graben, 

 filled with Trias -Jurassic deposits. The Sineglazov area (■'■''') was the most 

 favourable for the application of the loop method. Here, the investigations 

 established the basic elements of the tectonics of the studied sediments. 

 The insufficient volume of experimental work did not permit reliable correc- 

 tion of the results of geological surveying. However, on the resultant map 

 a possible variant of the structure of the Sineglazov area, as deduced from 

 the data of the loop method (Fig. 8), was presented. 



It is certainly possible to survey by the loop method areas which in their 

 physico -geological characteristics are similar to the Sineglazov region. 

 However, this could not be said of the Miass and Sugovak sections, also 

 situated within the limits of the Chelyabinsk graben. In these areas a clear 

 interpretation of the map of loop vectors was difficult and required the use 

 of geological data(^'^). 



