314 



L. A. Galkin 



Fig. 4. Results of gas logging by means of DP and PG degasifiers (continuous curve- 

 total hydrocarbon gases; broken curve-total heavy hydrocarbons). Content of individual 

 hydrocarbon gases is given from the results of an analysis on a GST-2 instrument. 



The intervals of increased gas content (1257-1285 m) detected by means 

 of the DP degasifier can be described as water -bound and oil-bearing, since 

 the gas factor for them is 5-10 m^/m^, while the oil beds of the coal-bearing 

 sequence and the overlying Tournaisian limestones are characterized by 

 a gas factor of 15-30 m^/m^. 



The intervals (1257-1260 m and 1273-1283 m) v/ere tested and a flow 

 of water was obtained. A core sample taken from a depth of 1258-1259.8 m 

 consists of quartz sandstone, evenly permeated with oil. 



The interval with high gas readings at a depth of 1293-1303 m, situated 

 20 m from the top of the Tournaisian stage, has a gas factor of 15-20 m^/m^. 

 This provides a basis for assuming that the given interval is oil-bearing, 

 which is also supported by analysis of the gas composition, which differs 

 markedly from the gas composition in the intervals mentioned above*. 



The following conclusions may be reached on the basis of the foregoing: 



(1) the DP degasifier possesses a considerably higher degree of degasifi- 

 cation than the floating degasifier; 



(2) in working with the DP degasifier it is possible to detect oil-bearing 

 strata which have a small gas factor and are often missed when working 

 with a floating degasifier. 



* Separate analysis was conducted on a GST-2 instrument (see B. V. Vladimirov, 

 The GST-2 gas analyser for determining gas composition during gas logging. Neft. Khoz. 

 No. 8, (1956). 



