|
Lesser Caucasus is situated on the North-East of Anatolia-Caucasus-Iran region. Character peculiarities of the region are the microplate tectonics, existence of deep faults and ophiolite belts. On the basis of rocks properties, obtained at high pressures and temperatures and numerous geological-geophysical factual data are presented petrophysical section and evolution of crust.
On the suggested model of evolution of crust, general development of fluid regime, formation of hydrocarbon components, and also oil-gas bearing structures in the crust of Lesser Caucasus are considered.
The main source is considered 3-rd serpentinized layer, which in the geological time submerged from 7-8 km up to 35-50 km. During this process take place partial dehydration of serpentinized mass and separation of fluids and gas white hydrogen components. The existence of carbons in the form of gases and carbides in the depth of the Earth crust is a stipulated fact. The chemical reactions in the high termobaric conditions lead formation of inorganic hydrocarbons. The fluids, hydrocarbons and gases, trout the deep faults migrated to upper horizons and collected in the layers with collector properties.
Due to the proposed model evolution of Earth crust, the genesis of hydrocarbons in organic way to ride also because metamorphization of marine sediments of different age. That is the traditional form of genesis of hydrocarbons by organic way. The metamorphized complex in the territory of Armenia contains crystalline shale, lens of carbonates, graphitized and marbleized rocks etc.
Thus the organic and inorganic hydrocarbons, gases and fluids being formed at different depths of the Earth crust, migrate towards shallow horizons, along fracture zones, especially during seismotectonic process, and they are mixed and accumulated in rocks having collector properties.
Esteeming composition, structure and evolution of different regions of Glob, especially regions where in the composition of Earth crust are presented serpentinites and serpentinized ultrabazites by the form of different structures (layers, ophiolit structures etc); we tender to esteem these rocks as sources of genesis of hydrocarbons by inorganic way at their dehydration.
It is known that Arabic petroliferous basin consist a number of microplates disconnected by ophiolite structures, whose main components are serpentinites and serpentinized ultrabazits. Some specialists, who study this area mentioned, that there are not enough number of oil-source rocks for organic generation such quantity of hydrocarbons. We made comparative analysis of depth construction, composition and evolution of Earth crust of Lesser Caucasus with Arabian shield. As results we can consider that availability of petroleum resources in the Arabian shield can be connected with dehydrations of serpentinites on the depth and formation of inorganic hydrocarbons.
|
