Conditions responsible for the abundance of oil accumulations in the Persian Gulf region include the presence of a large volume of Mesozoic and Tertiary marine sediments, many of which were deposited under reducing conditions favoring the generation of petroleum hydrocarbons, the close association of source and reservoir beds throughout an extensive shelf area, the widespread distribution of large anticlinal structures, the availability of structural and stratigraphic traps during the initial migration of oil, and the presence of effective cap rocks.

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