As a result to locate such huge and prospective oil deposits the oil drilling companies do make use of the geologists, to exactly locate the depth and the position of the oil wells. Though the technology used by the geologists can really position and tell the oil exploration company regarding the approximate location of the oil wells and the depth were they will be found, they still cannot give any guarantee regarding the quantity and also the quality of the petroleum that will be contained inside these oil wells. Because of this there have been many instances, where the quantity as well as the quality of the petroleum has been less and not up to the standards that are marked by the international commodity market. But still the oil exploration and drilling companies are ready to take such risks since they very well know that they can offset such losses when they find a rich strike of petroleum.