ABSTRACT:

The basins of the Tethys north margin have a number of common features of oil and gas accumulation distinguishing them from the oil-geologic elements of the south (Gondwana) margin. Geochemical specificity of oil-gas basins (OGB) of these two paleoocean margins and their tectonic and formation differences influence the resource characteristics of the basins and oil-gas accumulation zones and also the prevailing phase type of hydrocarbon fields. The basins of the Tethys north margin, as opposed mainly to oil accumulations of its south periphery, are characterized by mixed oil-gas accumulations and gas accumulations. The considerable gas potential of the north OGB, which are geodynamically more active, is related to the development of hydrocarbons of several generations including biochemical origin gases. The size and density of hydrocarbon resources in the zones of hydrocarbon accumulation in the south basins far exceed ones in zonal groups of oil and gas fields on the Tethys north margin. The parameters of these groups are often less than the corresponding indices of mean oil-gas accumulation zone in the Mediterranean belt with hydrocarbon resources of 670 million t (o.e.) and density of resources of to 800 thousand t/km2. In this connection it is expected that mainly middle and small fields (on reserves) of mixed or gas composition will be discovered in the Tethys north districts. In contrast to it, many more large accumulations of liquid hydrocarbons are predicted in the southern regions.

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