Możliwości wykorzystania wgłębnego rozpoznania warunków geotermodynamicznych w badaniach występowania węglowodorów

Jacek Majorowicz



The possibilities of preliminary selecting geothermal criteria for search for hydrocarbon accumulations in Poland is analysed. First part of this paper presents results of studies of the influence of geothermal conditions on zonality in vertical distribution of oil and gas accumulations, based on data from Soviet and American literature. The results of studies on contribution of geothermodynamic conditions to processes of origin of these accumulations are also given.
On the basis of these studies there were accepted geothermodyamic criteria for oil and gas deposits for the area of Poland. Maps of temperature distribution were drawn for the depths of 3 km, 4 km, 5 km and 6 km on which were differentiated zones in which temperature exceeds 149°C at a given depth, that is, where there are conditions destructive for oil and gas deposits. Taking into account the existence of Permian magmatism in south-western Poland it may be assumed that paleotemperatures exceeding those sufficient for destruction of oil deposits and their alternation into gas deposits existed in vast areas of occurrence of Permian and older rocks.
According to the other criterion accepted, temperature over 60°C is necessary for the beginning of catagenesis. The analysis of dependence of heat flow on age showed that the paleotemperatures recorded at a given depth are close to those presently measured in areas with Precambrian basement.
Comparison of geothermal conditions from Polish and Soviet parts of the Peri-Baltic syneclize showed that the occurrence of hydrocarbon deposits in the Lithuanian SSR in the determined by geothermodynamic conditions more favourable than in Poland.

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