Abstract: Reservoirs in the northern North Sea Basin range from fractured basement to Eocene deposits. There are five sets of main reservoirs:① the Permian Rottiegeudes aeolian and/or alluvial sandstones;②the Triassic fluvial sandstone;③the Middle and Lower Jurassic fluvial, deltaic and marginal marine sandstone; ④the Upper Jurassic shallow marine and deep marine turbidite sandstone and conglomerate; ⑤the Upper Cretaceous- Lower Paleocene chalk and Paleocene deep-sea turbidite fan sandstones. It is found that the Paleocene- Eocene sandstone is weak in diagenesis and permeability becomes lower under 3100 m. The dissolution of K-feldspar is a major factor influencing diagenesis and permeability in the shallower part. Then illite becomes the main factor below about 3700 m, and secondary quartz plays a major role in the sequence below 4000 m. Oil and gas accumulation depends on the distribution pattern of reservoirs.