Abstract: Located in north-central part of Central Iran Basin, Iran Islamic Republic, Garmsar block is a Cenozoic sedimentary depression formed in the background of compression stress field. Since the Tertiary Period, influenced by collision compression in opposite directions of Elburz orogenic zone and Zagro folded zone, complicated fold-thrust faulted deformation occurred in the basin, resulting in stratigraphic uplift folds and tilting fault blocks, and forming various types of local structural traps in Garmsar Block. Qum Formation has favorable configuration conditions of source, reservoir and cap rocks, and can form self-generating and self-accumulating plays. Fault-bend folds or fault-propagation folds resulting from thrusting activities within Qum Formation can be favorable oil & gas traps. Therefore, there is certain exploration prospect in Garmsar block

Key words: Central Iran Basin, Garmsar Block, Qum Formation, structural trap, exploration prospect