NEW METHODS OF ELECTRICAL EXPLORATION IN SIBERIA 



201 



ment, and by a number of specially developed methods (method S, the 

 method of giving the value Qi, the method for transforming curves of quad- 

 rilateral azimuthal probing into curves of axial probing). 



As an example, results are given for studies in two different regions of 

 the Western Siberian Lowlands. 



First of all, we Avill deal with the material of the qualitative and quanti- 

 tative interpretations of two-way probing on the north-west ends of the 

 Koly van' -Tomsk fold belt (the work of 1955). The surveyed area includes 

 the pre-Jurassic foundation, covered by Meso-Cenezoic aranaceous argil- 

 laceous deposits^ and dipping in a north-westerly direction to depths of the 

 order of 1000 m. The problem of the electrical survey was to study the 

 rehef of the surface of the pre-Jurassic foundation. 



Troilskoe 



R Komyshenka 



Fig. 3. Map for Aq vectors for an operating distance R = 3000 m. 1 — centres 

 of 2 -sided equatorial and azimuthal probes by the VNIlGeofizika party; 2 — vector 

 ofAg; 3 — centres of two-way quadrilateral probes by the Sibneftegeofizika Department. 

 The numerator represents the number of the probe ; the denominator represents the 



- ? + Q — 

 value for the vector Aq= 100 . 



