Oil and gas accumulation
ACCUMULATION OF OIL AND GAS (EN: oil and gas accumulation; DE: Erdol- und Gasspeicherung, Erdol- und Gasakkumulation; FR: accumulation de petrole et de gaz; ES: acumulacion de gas y petroleo; RU: аккумуляция нефти и газа) is the accumulation of the oil and (or) gas in the traps. As a result, oil and gas, which are scattered in the layer (formation) waters, concentrate themselves into the reservoirs.
The accumulation of the oil and gas is the final stage of the complicated process of the migration of the oil and gas from the zones of the formation into the zones of the accumulation. According to the gravitational theory, the main cause of the accumulation of the oil and gas is the buoyancy (the floating of the hydrocarbons in the water). The accumulation proceeds in those places, where the oil and gas can not rise higher because of the arch of the anticline has been reached, or the collector has wedged itself up along the updip of the layers.
The migration of the accumulation of the oil and gas because of the pressure of the moving water is the basis of the hydraulic theory, according to which only oil and gas are catched in the trap. According to the capillary theory, the accumulation is caused by the phenomena of the surface tension, capillary and other forces. Most of the researchers explain the accumulation of the oil and gas by the combined action of the above listed forces.
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