Abstract: There are significant differences in the sedimentary reservoir characteristics of different types of deep-water turbidite channel systems. Taking the restricted deep-water turbidite channel system of the P oil formation in the North Sea G Oilfield in the UK as an example, seismic geomorphology methods, drilling and core data were used to characterize the distribution characteristics of the internal reservoirs in the turbidite channel system, and to clarify the impact of diagenesis on reservoirs in North Sea through thin section and electron microscopy observation. Research indicats that: 1) the P oil formation developed within a restricted U-shaped canyon, forming a typical "three group" sedimentary pattern vertically; 2) the bottom A and B sand formation is composed of coarse-grained sediments. At the bottom, the A sand body is not developed and does not deposit, and is in unconformable contact with the underlying strata; the B sand group is a mud debris flow mixed with plastic flow; the central C sand formation covers the entire canyon and has the best reservoir quality; the top D sand formation is a late stage sedimentation, mainly composed of natural mud embankments; 3) the upper and lower oil groups do not have good physical properties but the middle group does. This study not only has significant theoretical implications for the development of deep-water sedimentology, but also has important practical significance for the exploration and development of similar oil fields.

Key words: North Sea of UK, restricted deep-water turbidite channels, U-shaped canyon, "three group" sedimentary pattern, reservoir characteristics