AWALI (RU: Авали) is the oil and gas field in Bahrain, one of the largest in the world. It is the part of the Persian Gulf oil and gas basin. It has been discovered in 1932, and is developed since 1933.
The initial recoverable reserves are 136 million tonnes of oil, and 530 billion cubic metres of gas. The oil field is in the conjunction with the brachyanticlinal fold of the 8x22 kilometres in size, the formation of which is determined by the salt tectonics. The reservoirs are stratified and high domed. The carbonate rocks of the Upper and Lower Cretaceous and the Upper Jurassic origins contain oil.
The gas reservoirs are in the conjunction with the limestones of the Upper Jurassic and Permian. The bedding depth of the productive horizons is 0.6-3.5 kilometres. The collectors are granular and porous with the cracks. The main oil production is carried out from the Lower Cretaceous depositions of gas, mostly from the Permian. The initial stratum pressure is 13.5 megapascals, the temperature is 68 degrees Celsius. The density of the oil is 845-850 kilograms per cubic metre, the admixture of the sulfur chemical element is 2%. There are in operation 117 gushing oil wells and 125 pumped oil wells there, the annual oil extraction is 2.5 million tonnes (1980), the cumulative oil extraction (1981) is 93.9 million tonnes. The gas is dry, methane, contains about 20% of the inert gases and CO2. The annual gas extraction is 5 billion cubic metres (1980).
The gas is used in order to provide the energy for the aluminium smelting plant and for the injection into the stratum. The field is operated by the "Bahrain National Oil Company".
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