New prospects of oil-and-gas fields exploration in the south-east of Tomsk region

The oil and gas content analysis of the Chulymo-Yenisei depression began in 1930s. Many outstanding geologists gave controversial estimations of the area potentials. In 1950s a key borehole was drilled near the village Teguldet. The results of the exploration during the borehole construction were considered at the oil panel of NRGSI in 1957. Having studied the research papers and having discussed the report made by Z.N. Poyarkova, scientists at the panel came to the conclusion that the area had no perspectives for hydrocarbon prospecting. For the next 50 years this decision actually stopped exploration activities within the Chulym depression. At present, the evolution of geologic views on the structure of oil and gas-bearing area as well as the conditions in oil-and-gas industry of Tomsk region made the scientists change their point of view on the problem of oil-and-gas potentials of the Chulym depression. Nowadays, there is hardly a single person who questions that the Chulym depression is the northern extension of the cascade of Minusinsk depressions, the presence of oil and gas in which is proved. Analysing the geological features of the Minusinsk and the Chulym depressions, scientists stated that geological conditions within the Chulym depression are more favourable for hydrocarbon accumulations. This was determined by the fact that the Chulym depression underwent erosion and denudation processes to a lesser extent, and that resulted in Palaeozoic complex being preserved, the presence of oil and gas in which was detected within the Minusinsk cascade of depressions. Besides, within the Chulym depression there is a well-developed sedimentary cover, which is similar in structure to that of the western part of Tomsk region. This fact accounts for the potentials of Jurassic complex in the given area as well, because it is in Jurassic depositions that major hydrocarbon reserves in the west of the region are concentrated. Having carried out the generation potential analysis of the given area, V.N. Rostovtsev and S.N. Reznik have made the conclusion that if within the region indications for the calculations will at least be taken below average, the area of the Chulym depression is capable to accumulate deposits with ultimate gas reserves of 4.6 trillion cubic meters

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