Reservoir properties and their controlling factors in different tectonic settings,sedimentary environments and burial depth are studied by analyzing a large amount of data of reservoir properties，combined with thinsection petrography and scanning electron microscopic(SEM)analysisThere are many types of clastic reservoir rocks in the Paleogene of Dongying Sag，mostly formed in different sedimentary environments，such as alluvial fan，river，fan delta，nearshore subaqueous fan,deepwater turbidite fan，deltafront slump turbidite fan，shoreshallow lake bar and so onClastic reservoir rocks consist of conglomerate，pebbly sandstone，mediumcoarse sandstone，fine sandstone and siltstone，of which medium sandstone and fine sandstone are thebest reservoir rocksReservoir properties of rocks in different sedimentary facies and areas are differentReservoir rocks in fluvial，[BF](fan)[BFQ]deltafront subaqueous distributary channel and mouth bar,have the most effective reservoir propertiesCentral uplift zone has better reservoir properties than north steepslope zone and south slope zone at the same burial depthIn addition，reservoir properties are getting worse and worse with increasing burial depth(influence of secondary pores are not taken into account).Based on the analysis of reservoir properties and diagenetic，the reservoir properties of clastic rocks in Dongying Sag are dominated by four factors，namely compaction,carbonate dissolution，cementation，and sedimentary conditionsAmong them，compaction and diagenetic degree(the relative degree of dissolution and cementation)are main factorsThe effect of sedimentary conditions on reservoir properties manifests the development of primary pore，and its control on dissolution and cementation