248 1. 1. Krolenko 



Avhich appear most distinctly if the obsevations are processed by the integration 

 method <^^\ 



As a result of a correlation of the above -described investigations, carried 

 out in 1950, a map of the tectonic structure of the south-west plain of the 

 Kerch peninsula (see Fig. 2) was constructed. 



This map shows a regular pattern of structures, arranged along tectonic 

 lines, and also the region of a sharp change in direction of these lines from 

 close to east -west in the northern and central parts of the plain, to the north- 

 east in the southern and eastern parts (^^' ^^K 



The change in direction of the structural units of the south-eastern 

 part of the Kerch peninsula in comparison with the central, is of interest 

 since it can provide favourable conditions for accumulating sand facies in 

 the geological section (^^). 



About 90 % of the structures recorded in the Zaparpachskaia part, by the 

 loop method and up to 60% in the south-western plain of the Kerch pensinsula, 

 have been covered in the post-war years by geological surveying. In the case of 

 many of the structures, core and deep drilling were carried out. On the basis of 

 the materials obtained, composite structural maps were compiled of both the 

 south-west plain and of the Zaparpachskaia part of the Kerch peninsula. 



A comparison of these maps with similar maps based on the loop method 

 indicates the correctness of the loop method for both the general pat- 

 tern of the tectonics in the Kerch peninsula and of the components of 

 structure of the tectonic zones and individual structures. Geophysical data 

 on many areas not only support the geological survey but in a number of 

 cases considerably improve it with additions and corrections. 



Oil prospectors on the Kerch peninsula are faced with the problem of 

 finding the relationship between the tectonics of the upper levels, studied 

 by the loop method, and the structure of the lower parts of the Tertiary 

 and Cretaceous systems. To solve this problem use was made of magne- 

 tometry, gravimetry and seismic exploration. 



The gravitation field of the Kerch peninsula is characterized by a continuous 

 increase in gravity towards the south. Apparently, owing to the presence 

 of a large gravity gradient, local anomalies in the gravitational field appear 

 only in the form of deflections in the isoanomalies. This can be illustrated 

 by the coincidence of the zone of disturbance with a region of gravitational 

 minima, shown on the map by distinct deflections in the isoanomalies. 



The magnetometric surveys carried out on the Kerch peninsula in 

 1948 showed an increase in the intensity of the geomagnetic field to the 

 north, which is apparently connected with an increase in this direction of 

 the thickness of deposited formations (^*). 



